Production Guide for
Organic Strawberries
2012
NYS IPM Publication No. 226
Integrated Pest Management
New York State
Department of
Agriculture & Markets
2012 Production Guide for
Organic Strawberries


Coordinating Editors
Juliet Carroll* (Cornell University, New York State IPM Program)
Marvin Pritts* (Cornell University, Department of Horticulture)
Catherine Heidenreich* (Cornell University, Department of Horticulture)
Contributors and Resources
Kerik Cox* (Cornell University, Department of Plant Pathology and Plant Microbe-Biology)
Greg Loeb* (Cornell University, Department of Entomology)
Michael Helms* (Cornell University, Pesticide Management Education Program)
Andrew Landers (Cornell University, Department of Entomology)
Paul Curtis (Cornell University, Department of Natural Resources)
Courtney Weber (Cornell University, Department of Horticultural Sciences)
Laura McDermott (Cornell Cooperative Extension, Capital District Vegetable and Small Fruit Program)
*Pesticide Information and Regulatory Compliance
Staff Writers
Elizabeth Graeper Thomas (Cornell University, New York State IPM Program)
Theodora Bucien (Cornell University, New York State IPM Program)
Editing for the 2012 update
Mary Kirkwyland (New York State IPM Program)
Marion Zuefle (New York State IPM Program)

Special Appreciation
Format based on the Cornell University Pest Management Guidelines for Berry Crops ipmguidelines.org/BerryCrops/,
content editor Marvin Pritts and coordinating editor Cathy Heidenreich; and on the Production Guide for Organic
Grapes, coordinating editors Tim Weigle and Juliet Carroll.
Funded in part by the New York State Department of Agriculture and Markets.


The guidelines in this bulletin reflect the current authors’ best effort to interpret a complex body of scientific research, and to translate
this into practical management options. Following the guidance provided in this bulletin does not assure compliance with any
applicable law, rule, regulation or standard, or the achievement of particular discharge levels from agricultural land.
Every effort has been made to provide correct, complete, and up-to-date pest management information for New York State at the time
this publication was released for printing (February 2011). Changes in pesticide registrations, regulations, and guidelines occurring
after publication are available in county Cornell Cooperative Extension offices or from the Pesticide Management Education Program
web site (pmep.cce.cornell.edu). Trade names used herein are for convenience only. No endorsement of products is intended, nor is
criticism of unnamed products implied.

This guide is not a substitute for pesticide labeling. Always read the product label before applying any pesticide.

Updates and additional information for this guide are available at
www.nysipm.cornell.edu/organic_guide. Please submit comments or suggested
changes for these guides to



This guide is published by the New York State Integrated Pest Management Program, which is funded through Cornell University, Cornell Cooperative
Extension, the New York State Department of Agriculture and Markets, the New York State Department of Environmental Conservation, and USDA-
NIFA. Cornell Cooperative Extension provides equal program and employment opportunities. NYS IPM Publication number 226, May 2012.

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This guide for organic strawberry production is focused on nutrient and pest management practices and includes
topics that have an impact on improving plant health and reducing pest problems. The guide is divided into
sections, but the interrelated quality of organic cropping systems makes each section relevant to the others.
Strawberries are moderately amenable to organic production. The greatest challenge, by far, is weeds, particularly in
the planting year. Studies have shown that sustained weed pressure in the planting year can negatively affect yield for
several subsequent years. It is also difficult to provide a large amount of nitrate nitrogen when the strawberry plant
needs it most: early spring and late fall. There are also a few pests that can be impossible to control organically if the
weather does not cooperate (e.g. gray mold on fruit). But, with sufficient attention to weed management, especially
in the planting year, and with good soil nitrogen reserves, strawberries can be successfully grown with organic
production methods.
Organic strawberry production systems generally share five common characteristics, described in the Strawberry
Production Guide for the Northeast, Midwest, and Eastern Canada, NRAES-88:
1. Several years elapse between successive strawberry crops. That is, practice 3- to 5-year-long crop rotations.
2. The production cycle is short, only one or two fruiting years, to avoid the establishment of perennial weeds

and depletion of nitrogen reserves.
3. The labor requirements are high because of the need for hand-weeding and frequent light cultivation.
4. Yields tend to be lower in older plantings because weeds and pests tend to build up over time.
5. There is variability in yield due to weather and variable pest pressure.
For a more comprehensive understanding of strawberry production we suggest the following resources: Strawberry
Production Guide for the Northeast, Midwest, and Eastern Canada, NRAES-88 available for purchase from:
and Strawberries: Organic Production. For those interested in strawberry
production using day neutral strawberries we suggest: Season-long Strawberry Production with Everbearers.
More research on growing perennial crops organically is needed, especially in the area of pest management. This
guide attempts to compile the most current information available, but acknowledges that effective means of organic
control are not available for some pests. Future revisions to this guide will incorporate new information providing
organic growers with a complete set of useful practices to help them achieve success.
This guide uses the term Integrated Pest Management (IPM) which, like organic production, emphasizes the use of
cultural practices to minimize pest outbreaks. With the limited pest control products available in many organic
production systems, IPM techniques such as keeping accurate pest history records, selecting the proper site, and
preventing pest outbreaks through use of sanitation, variety selection and biological controls are essential to
producing a high quality crop.
All website addresses and links are listed in Section 10: References. A glossary of terms used in this guide is included
at the end in section 11.

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Operations or portions of operations that produce or handle agricultural products that are intended to be sold,
labeled, or represented as "100 percent organic," "organic," or "made with organic ingredients" or food group(s).
Farming operations that gross more than $5,000 per year in organic products and want to use the organic label must
be certified by a USDA National Organic Program (NOP) accredited certifying agency. The choice of certifier may be
dictated by the processor or by the target market. A list of accredited certifiers operating in New York can be found
on the New York State Department of Agriculture and Markets Organic Farming Resource Center web page. See more
certification details in this guide under Section 3.1: Organic Certification Site Requirements.

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Producers and handling (processing) operations that sell less than $5,000 a year in organic agricultural products do
not need to be certified. Although exempt from certification, these producers and handlers must abide by the national
standards for organic products and may label their products as organic. Handlers, including final retailers, that: do not
process or repackage products; only handle products with less than 70 percent organic ingredients; process or
prepare, on the premises of the establishment, raw and ready-to-eat food labeled organic; choose to use the word
organic only on the information panel; and handle products that are packaged or otherwise enclosed in a container
prior to being received by the operation and remain in the same package. More information can be found at the
National Organic Program USDA Agricultural Marketing Service website.
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An organic farm plan is central to the certification process and is a good management tool, regardless of whether or
not certification is being sought. The farm plan describes production, handling, and record-keeping systems, and
demonstrates to certifiers an understanding of organic practices for a specific crop. The process of developing the
plan can be very valuable in terms of anticipating potential issues and challenges, and fosters thinking of the farm as
a whole system. Soil, nutrient, pest, and weed management are all interrelated on organic farms and must be
managed in concert for success. Certifying organizations may be able to provide a template for the farm plan. The
following description of the farm plan is from the NOP web site:
The Organic Food Production Act of 1990 (OFPA or Act) requires that all crop, wild crop, livestock, and handling operations
requiring certification submit an organic system plan to their certifying agent and, where applicable, the State Organic
Program (SOP). The organic system plan is a detailed description of how an operation will achieve, document, and sustain
compliance with all applicable provisions in the OFPA and these regulations. The certifying agent must concur that the
proposed organic system plan fulfills the requirements of subpart C, and any subsequent modification of the organic plan by
the producer or handler must receive the approval of the certifying agent.

Find more details at the USDA Agricultural Marketing Service’s National Organic Program website. The National
Sustainable Agriculture Information Service, (formerly ATTRA), has produced a guide to organic certification that
includes templates for developing an organic farm plan. The Rodale Institute has also developed resources for
transitioning to organic and developing an organic farm plan.

It is important to note that the USDA National Organic Program requires that applicants for certification must keep
accurate post-certification records for 5 years concerning the production, harvesting, and handling of agricultural
products that are to be sold as organic. These records must document that the operation is in compliance with the
regulations and verify the information provided to the certifying agent. Access to these records must be provided to
authorized representatives of USDA, including the certifying agent.

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Healthy soil is the basis of organic farming. Regular additions of organic matter in the form of cover crops, compost, or manure
create a soil that is biologically active, with good structure and capacity to hold nutrients and water. The minimum acceptable
days to harvest interval for raw manure is 120 days (see National Organic Standards); buyers may require a period longer than
120 days between application and harvest however. Always maximize the time between the application of raw manure and
harvest; in the case of perennial strawberry plantings, application during the planting year is recommended so that manure is
not applied during a bearing year. It is important to never side dress with raw manure or use straw that has been used as animal
bedding. Decomposing plant materials will support a diverse pool of microbes, including those that break down organic matter
into plant-available nutrients as well as others that compete with plant pathogens in the soil and on the root surface. The
practice of crop rotation to promote a healthy soil should be initiated in the one or two years prior to planting establishment.
Organic growers must attend to the connection between soil, nutrients, pests, and weeds to succeed. An excellent resource for
additional information on soils and soil health is Building Soils for Better Crops, 3
rd
edition, by Fred Magdoff and Harold Van
Es, 2010, available from www.sare.org/publications/soils.htm, SARE, Sustainable Agriculture Research and Education. For
more information, refer to the Cornell Soil Health website, soilhealth.cals.cornell.edu/.

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For organic strawberry production, the importance of proper site selection and preparation cannot be over-
emphasized. Strawberries are usually grown for two to three years in organic production systems, bearing fruit in the
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second and third years. This approach maximizes yields while soil nitrogen content remains at acceptable levels.
Consider that an ideal site should be close to your markets, be of sufficient acreage to allow for crop rotation, have

available water of acceptable quality for irrigation and frost protection, have well-drained soil, and good air drainage
(slopes of 3-4% preferably facing north and away from prevailing winter winds). Sites should not have recently been
cropped to plants susceptible to Verticillium wilt.
Conduct needed site improvements prior to planting. Once strawberries are planted it is very difficult to make major
changes to improve soil and air drainage, or to modify soil tilth, pH, or nutrient status. Improving soil structure or
eliminating soil compaction layers in an established planting rarely prove feasible given the few years the crop is in
the ground.
Weather plays a critical role in site selection, as well. The macroclimate, mesoclimate and microclimate of a
strawberry site play important roles in variety selection and potential profitability. Of particular importance are the
potential for spring frosts, winter minimum temperatures, length of the growing season, and growing season heat
accumulation. More detailed information on the site selection information presented here also can be found in
Strawberry Production Guide for the Northeast, Midwest and Eastern Canada, NRAES-88.
A web-based, interactive site selection tool, the New York Vineyard Site Evaluation System, www.nyvineyardsite.org,
uses specific climate information with a 3 kilometer resolution, based on 30 years of weather data, to determine the
suitability of your site for different grape varieties. Although the tool was developed for vineyards, the map-based
system integrates information on climate, topography, soils, and winter low temperatures much of which may be
applicable to site selection for strawberry varieties across the state.
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The National Organic Program has requirements that affect site selection. Fields must not have been treated with
prohibited products for three years prior to harvest of the certified organic crop. Mandated one-year crop rotation
out of strawberries must be observed, though a 3-5 year rotation is typical. Adequate buffer zones must exist
between certified organic and conventionally grown crops to prevent drift of prohibited materials onto certified
organic crops. The buffer zones must be either a barrier (diversion ditch or dense hedgerow) or an area of sufficient
size. The buffer zone needed will vary depending on equipment used on adjacent non-certified land. For example,
use of high-pressure spray equipment or aerial pesticide applications in adjacent fields will increase the buffer zone
size. Check with your certifier for specific buffer requirements. Buffer zone sizes commonly range from 20 to 250 ft,
depending on adjacent field practices. Buffers can include windbreaks and living barriers such as a dense hedgerow.
A dense hedgerow less than 50 ft wide may offer better protection from contamination than a 50-ft-wide open buffer
zone. The National Organic Farmers Association of New York (NOFA NY) organic certification guidance manual
states, “If the buffer is planted to the same crop as the field, documentation of what is done with the non-certified

buffer crop is required. If harvested, non-certified harvest records and equipment cleanout logs should be maintained.
” Crops grown in the buffer zone may not be marketed as certified organic, or used for feed or bedding for certified
organic livestock or dairy cattle.
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Preparations for a strawberry planting should begin at least one year in advance. Selecting a site with good air and
water drainage is essential for successful organic production. A nutritionally healthy planting in a well-drained soil
with exposure to air movement is least susceptible to damage from pests and frosts.
Strawberries need good internal soil drainage to grow and do best on a well-drained sandy loam. Wet soils restrict
root growth and respiration, resulting in weak growth and reduced yields. Coarse-textured soils have excellent soil
drainage, but heavier soils, or soils with perched water tables often need drainage tiles to remove excess water and
improve internal soil drainage. Drainage tile is best installed before planting. Local soil and water conservation
districts and private tiling contractors can provide technical assistance in designing a drainage plan, but keep in mind
that many base their designs on annual row crops. Perennial crops often require more intensive drainage than
annual row crops. Planting on raised beds or on berms is useful to improve soil drainage in the rooting zone.
Strawberries should not be grown on heavy clay soils. Because of the need for frequent light cultivation to manage
weeds, stony and gravelly soils can also prove difficult.
Air drainage is an important consideration in choosing a strawberry field site. Cold air, like water, runs down hill,
and collects in low areas or areas where trees or hedgerows obstruct airflow. These ‘frost pockets’ increase the risk
of both mid-winter cold injury and spring frost damage. Selecting a site with a gentle slope (3-4%) and good air
drainage will reduce the risk of cold or frost injury. Good air drainage will also promote faster drying of foliage,
flowers and fruit which will reduce the duration and frequency of disease infection periods. Good air drainage is
essential to an organic disease management strategy.
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Although strawberries can be grown on a wide variety of soils, shallow soils have less water holding capacity and
will limit root development, resulting in smaller plants with smaller crops. Rooting depth of 12 inches or more is
considered important for adequate plant growth and cropping levels. Digging test soil pits can help you evaluate
potential rooting depth and drainage issues and evaluate what measures to take to address soil management issues
before planting.
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Knowing all you can about the soil of a potential strawberry site will allow for better management decisions prior to
planting. Soil testing is recommended to provide information on pH, availability of major and minor nutrients, organic
matter and cation exchange capacity. A pH of 6.0 to 6.5 is suggested for most strawberry varieties. See Table 6.1 for
soil and tissue testing laboratories and refer to section 6, Nutrient Management, for more information.
A nematode analysis performed on representative soil samples is a wise step in the year or two prior to planting
since it will allow time for using a cover crop to reduce plant parasitic nematode populations, see section 4, Cover
Crops, for more information. Samples may be submitted for nematode testing to the Plant Disease Diagnostic Clinic,
College of Agriculture and Life Sciences, Ithaca, NY. For more information and fee schedules visit their website at
www.plantclinic.cornell.edu. The best time for collecting samples for nematode testing is during summer, when soils
are moist, not dry. A minimum of 6 soil subsamples, approx. 1 diameter and 4 deep should be collected randomly
from an area approx. ½ acre in size. Gently mix samples together, transfer about 1 pint of mixed soil to a plastic bag,
and ship as soon as possible to the diagnostic lab. Refrigerate sample if it cannot be shipped immediately.
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Another factor to consider when selecting a site is previous cropping history. The Verticillium wilt fungus may persist
many years in soil and is devastating to strawberries under conditions favorable for disease development. If possible,
avoid sites where potatoes, tomatoes, eggplants, or brambles have recently been grown and, to a lesser extent,
squash, cucumber, pepper, or melons. These crops serve as hosts to Verticillium wilt. Many weeds are also hosts of
the Verticillium fungus, particularly nightshade, groundcherry, redroot pigweed, lambsquarters, and horsenettle.
Weeds should be strictly controlled in current and future planting sites to keep Verticillium inoculum low. Rotating to
non-susceptible grasses and cereals (5-8 year rotation) will reduce the amount of Verticillium inoculum in infested
soil, but seldom eliminates it. Brassica crop rotations (mustards, broccoli, Brussels sprouts) are recommended where
Verticillium wilt is present or has been observed in the past. Brassicas should be grown for a 2-yr period and crop
residues incorporated into the soil. Practice long rotations out of strawberry and plant only resistant varieties where
Verticillium wilt is a problem.
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Another important criterion to consider when selecting a strawberry site is irrigation water quantity and quality. The
irrigation water source should provide sufficient volume of water to irrigate as needed during the growing season.
The irrigation system should be in place prior to planting to insure availability of water to the new transplants and to
provide frost protection on cold nights during bloom. Trickle irrigation uses water more efficiently than overhead
irrigation, but overhead irrigation can be used for frost protection. With trickle systems, row covers are required for

frost protection in the absence of overhead irrigation. Summer-fruiting strawberries, grown in a matted row system,
typically require 1 to 2 inches of rainfall per week, or 25 to 30 inches per season. The critical periods when
strawberries require sufficient water to optimize growth and yield are during the fruiting period and after renovation.
Be sure to have a water test done on irrigation water sources prior to site selection to determine its physical,
chemical, and biological constituents. Irrigation water pH should be 7.0 or below, and should also have a low salt
content (<2.0 ds/m; preferably <1.0 ds/m; ) as strawberries are a salt-sensitive fruit crop. Always check with your
certifier on the products used for lowering irrigation water pH. Water contaminated with sewage or manure should
not be used to irrigate strawberries. Use only potable water to irrigate strawberries during bloom and harvest. For
more information on irrigation see: Strawberry Production Guide, NRAES-88.

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Cover crops are grown for their valuable effect on soil properties, such as organic matter, and, in strawberries, on
their preplant ability to eliminate or suppress weeds, provide nutrients to the plants, and reduce nematode
populations. They can also improve water infiltration into the soil, maintain populations of beneficial fungi, and may
help control insects and diseases. To be effective, cover crops should be treated as any other valuable crop on the
farm, with their cultural requirements carefully considered and met, including nutrient requirements; susceptibility,
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tolerance, or antagonism to root pathogens and other pests; life cycle; and mowing/incorporation methods. See
Table 4.1 for more information on specific cover crops.
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Cover crops play an important role in a strawberry planting, especially during the years prior to planting through
improvement of soil organic matter, breaking up of compaction layers, erosion control, and suppression or
elimination of weeds. Goals should be established for choosing a cover crop; for example, the crop can add nitrogen,
smother weeds, or reduce nematode populations. The cover crop might best achieve some of these goals if it is in
place for an entire growing season and incorporated into the soil prior to plant establishment.



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Cover crops planted in late summer will suppress annual weed growth, improve soil texture, provide organic matter,
and may increase soil nitrogen. The cover crop can be incorporated in late fall or in early spring before planting.
Certain cover crops (marigold, sudangrass) will either suppress or resist nematode populations. In addition to
producing large amounts of biomass that out-compete other plant species, some cover crops (annual rye, ryegrass)
can inhibit weed growth through allelopathy, the chemical inhibition of one plant species by another. Rye provides
allelopathic suppression of weeds when used as a cover crop, and when crop residues are retained as mulch. Rye
residues retained on the soil surface release chemicals that inhibit germination and seedling growth of many grass
and broadleaf weed species. Retention of residue on the soil surface can be accomplished by mowing before seed
head formation.
See Cornell’s online decision tool to match goals, season, and cover crop. Although written for vegetable growers it
has comprehensive information on various cover crops. Another resource for determining the best cover crop for

your situation is the Northeast Cover Crop Handbook, by Marianne Sarrantonio.
Allowing cover crop residue to remain on the soil surface might make it easier to fit into a crop rotation and will help
to conserve soil water. Keep in mind that some of the nitrogen contained in the residue will be lost to the
atmosphere, and total organic matter added to the soil will be reduced. Turning under the cover crop will speed up
decomposition and nitrogen release from the crop residue. Cover crops such as grasses with low nitrogen content
should be plowed under in the fall to allow time for decomposition prior to planting strawberries. Legumes which
contain more nitrogen and decompose more quickly can be plowed under within a month of planting.
410&$HCTQHN&&
Legumes are looked to as a potential nitrogen source. Legumes may benefit from inoculation of seed with nitrogen-
fixing bacteria when planted in a field for the first time. Check with your certifier for allowable sources of inoculum.
Legumes such as red clover and hairy vetch will often benefit from having a nurse crop planted simultaneously,
usually a small cereal grain such as wheat or rye. These nurse crops establish faster than legumes and provide soil
stability and reduce weed pressure during establishment, and provide support for the newly growing legumes before
winter. To receive the full nitrogen benefit from planting legumes, they need to be incorporated into the soil just as
they start to bloom, which is usually in late spring. (Source: Bjorkman, T. Cover Crops for Vegetable Growers.)

71&5"-,%!8&+%$%)!,'*&
Key considerations in variety selection include the market destination and whether June-bearing or day neutrals will
be grown. Consider whether the strawberries will be shipped and, if so, choose varieties with good shelf life and
shipping quality. Flavor varies considerably between varieties, too, and may be inversely related to shipping quality.
Flavor may fluctuate depending on soil type, plant nutrition, and irrigation. Determine whether flavor or shipping
quality are most important to your market and choose varieties accordingly. More information about strawberry
varieties is available online, in the Strawberry Production Guide for the Northeast, Midwest, and Eastern Canada,
NRAES-88 (available for purchase from: www.nraes.org/), and in nursery catalogs.
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In organic strawberry production, the variety’s relative resistance or susceptibility to diseases is vital because of the
limited number of organic fungicides that are available for disease management. June-bearing varieties considered to
have the best potential for organic production in New York State include:
Earliglow (early season)

L’Amour (early/midseason)
Mesabi (midseason)
Winona (midseason)
Allstar (mid/late season)
Clancy (late season)
Varieties vary widely in their susceptibility to fungal diseases and some may be less susceptible to insects. If
susceptible varieties are planted, the importance of site, sanitation and cultural practices will increase in accordance
to the variety’s susceptibility. Table 5.1 lists the relative disease susceptibility of many of the strawberry varieties
grown in the Northeast. This is not an inclusive list and does not represent all varieties that are, or have been, grown
organically in New York State. Newer varieties for which disease resistance ratings were not available at the time this
guide was written include AC Valley Sunset, Daroyal, Herriot, Monterey, Portola and Record.

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Growers must also consider where they obtain their planting stock. According to language in the USDA-NOP
regulation §205.202, “the producer must use organically grown seeds, annual seedlings, and planting stock. The
producer may use untreated nonorganic seeds and planting stock when equivalent organic varieties are not
commercially available. Seed and planting stock treated with substances that appear on the National List may be used
when an organically produced or untreated variety is not commercially available. Planting stock used to produce a
perennial crop may be sold as organically produced planting stock after it has been maintained under a system of

organic management for at least 1 year. Seeds, annual seedlings, and planting stock treated with prohibited
substances may be used to produce an organic crop when the application of the substance is a requirement of
Federal or State phytosanitary regulations.” With the limited availability of organically certified strawberry stock,
growers will likely be able to justify the use of non-organic stock to their certifying agency.

91&*/!-,%*!&:"*";%:%*!&
To produce a healthy crop, soluble nutrients must be available from the soil in amounts that meet the minimum
requirements for the whole plant. The challenge in organic systems is balancing soil fertility to supply required plant
nutrients at a time and at sufficient levels to support healthy plant growth. Restrictions in any one of the needed
nutrients will slow growth and can reduce crop quality and yields. In strawberry plantings, the key considerations
when managing nutrition organically include preplant soil pH and nutrient adjustments; nutrition in established
plantings; and understanding carbon to nitrogen ratios to deliver appropriate amounts of nitrogen to the crop.
Organic growers often speak of feeding the soil rather than feeding the plant. A more accurate statement is that
organic growers focus their fertility program on feeding soil microorganisms rather than the plant. Soil microbes
decompose organic matter to release nutrients and convert organic matter to more stable forms such as humus. This
breakdown of soil organic matter occurs throughout the growing season, depending on soil temperatures, water
availability and soil quality. The released nutrients are then held on soil particles or humus making them available to
crops or cover crops for plant growth. Amending soils with compost, cover crops, or crop residues also provides a
food source for soil microorganisms and when turned into the soil, starts the nutrient cycle again.
One goal of the grower is to heighten resource use efficiency (land, water, nutrients) to optimize plant growth and
fruit yield. Plant size and yield can be influenced by water and nutrient supply (i.e. adequate water is needed for
adequate nutrient uptake). Weak plants with few, small leaves will intercept insufficient sunlight to produce adequate
yields in the current season or to develop flower buds for the next season. Conversely, over-stimulated plants with
abundant large, dark green leaves have low water use efficiency, are more prone to winter injury, diseases and insect
feeding, and produce fewer fruit. Organic strawberry plantings should strive to balance soil nutrient availability—via
irrigation, organic matter content, soil pH, and microbial activity—with plant growth and production goals.
Nutrient demand is greatest during leaf and fruit development in spring when reserve nutrients carried over from the
previous year have been used up and the plant is actively growing. Plant age, vegetative growth, and fruit yield are
the deciding factors in determining the need for nutrients during the growing season.
91@&+KFR&DEM&$HDJ&"EDRWNFN&

Regular soil and leaf analysis helps monitor nutrient levels. Choose a reputable nutrient testing lab (see Table 6.1)
and use it consistently to avoid discrepancies caused by different extraction methods. It is recommended that leaf
testing be incorporated into a fertility management program with soil testing to assist in determining the plants’
nutrient status and to make sure that what is in the soil is making it into the plants in the proper amounts. It is
recommended that soil and leaf tests be completed in each block. Leaf testing is especially crucial in getting the
information needed to make management decisions in problem areas of the planting and should be used on a more
frequent basis, if needed.





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Table 6.2 gives the target values for strawberry leaf nutrients sampled in late July or early August in the Northeast.

Regular soil testing helps monitor nutrient levels, in particular phosphorus (P) and potassium (K). The source of these
nutrients depends on soil type and historic soil management. Some soils are naturally high in P and K, or have a
history of manure applications that have resulted in elevated levels. Additional plant available nutrients are supplied
by decomposed soil organic matter or through specific soluble nutrient amendments applied during the growing
season in organically managed systems. Many types of organic fertilizers are available to supplement the nutrients
supplied by the soil. ALWAYS check with your certifier before using any product to be sure it is approved.

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Maintaining a soil pH range of 6.0 to 6.5 is recommended for strawberries. Use the soil test results to determine the
appropriate amount of lime (raise pH) or sulfur (lower pH) to apply. The lime or sulfur requirement will depend on
soil texture, current pH, and organic matter content. Follow the recommendations of the soil test and apply and
incorporate sufficient lime or sulfur prior to planting. It typically takes one year for the applied lime or sulfur to raise
or lower the soil pH, respectively. The slightly acid soil pH of 6.0-6.5 is required to help avoid micronutrient
deficiencies.
Prilled sulfur formulations are preferred for soil application because they are easier to work with, provide better
coverage, and are cheaper than powdered sulfur. Prilled sulfur takes about one year or more to oxidize and reduce
soil pH; powdered sulfur takes 6 to 9 months. Likewise, finely ground lime is more difficult to work with, but it will
raise the soil pH faster than coarse particles.
913&:DEDCFEC&*TIBFHEIN&&
Follow the recommendations of the soil test when adding nutrients to prepare a site for planting. Pay particular
attention to the soil test results for potassium, phosphorus, magnesium, calcium, and boron. If interpreting your own
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soil tests, it is important to know the phosphorus extraction method used by your analytical lab in order to get a
proper recommendation. When preplant recommendations are followed, additional potassium and phosphorus likely
will not be required unless the soil is very sandy. However, potassium (K) demand by strawberry plants is relatively
high, so make certain there is sufficient available potassium in the soil preplant. Boron is frequently low in fruit
plantings throughout the Northeast. Refer to '$N'1N$*&%#(*K-($P!1%*(!?(/-)*&'&0-(*!(1)- and Tables 8.1, 8.2, and
8.3 in Section 8.1 for converting amounts per acre to amounts needed for smaller areas and for measuring and mixing
small amounts.

In established plantings, base
fertilizer amounts on leaf analysis. In
the event that potassium is required,
a reasonable amount of potassium to
apply, preferably in the fall, is up to
100 lb/acre. See table 6.3 for organic
sources of potassium. Pay attention
to the K/Mg ratio and if it is above 4,
then additional magnesium should
be applied with the potassium
fertilizer to prevent inducing a
magnesium deficiency: the K/Mg
ratio should be less than 5.
Magnesium (Mg) deficiency in
strawberry is quite common. Factors
that influence magnesium availability
include soil pH and excess
potassium. In established plantings
that are low to deficient in
magnesium, typical
recommendations would be for 10-

40 lb/acre actual magnesium, but
follow recommendations of the leaf
analysis.
Boron is frequently low in fruit
plantings throughout the
Northeast. If boron is required,
then apply no more than 2
lb/acre actual boron in any one
year. The best time to apply boron
is after leaves are mowed at
renovation. Check with your certifier for information on allowable sources of magnesium and boron.
Phosphorus demand by strawberry is relatively low, and phosphorus is usually not required in established plantings.
Table 6.4 lists some organic fertilizer sources of P.
914&6BHUDBFEC&D&*FIBKCHE&#TMCHI&
The carbon to nitrogen (C/N) ratio in compost can provide a guide for nitrogen release into the soil solution. When
a decomposing material has a low C/N ratio (a lot of nitrogen) microbes release the excess nitrogen into the soil
solution. When a material undergoing decomposition has an initially high C/N ratio (very little nitrogen), microbes
will use whatever nitrogen is available for their own growth, leaving little for plants. This can result in temporary
nitrogen deficiency. Once the decomposition process begins to slow and those microbes die off, they will release
their nitrogen back into the soil where it will become available to plants. The rule of thumb is that if the C/N ratio is
less than 20 or the material’s nitrogen content is greater than 2.5%, then there will be enough nitrogen available for
both decomposer microbes and plants. If the C/N ratio is above 20, then nitrogen will likely be immobilized until
sufficient decomposition has taken place. One reason for applying nitrogen fertilizer at renovation is to help
overcome the temporary nitrogen deficiency that will occur when the straw (with a high C/N ratio) is worked into the
soil.
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Develop a plan for estimating the amount of nutrients that will be released from soil organic matter, cover crops,
compost, and manure. Submit soil samples for a Cornell Soil Health Test. This test includes an estimate of nitrogen
mineralization rate, which indicates the potential release of N from soil organic matter. Test results will provide
feedback on how the soil sample compares to other New York soils. The results can also be useful for monitoring
changes in the nitrogen mineralization rate over time and during the transition to organic production.
Management of N, and insuring adequate supply at the times of crop need, requires some planning. Prepare a
nitrogen budget for organic production to estimate the amount of N released by various organic amendments as well
as native soil organic matter. Examples of manures and their nutrient content are shown in Table 6.5. Compost and
manure should be tested for nutrient content at an analytical lab, and cover crops can be tested at a forage testing lab
(Table 6.1). Knowing these values will help evaluate if the budget plan is providing appropriate amounts of N during
the season by comparing them to the nitrogen guidelines for strawberries (Table 6.6)

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Using the values from your soil test, estimate that 20 lbs. of nitrogen will be released from each percent organic
matter in the soil. From the test of total N in any manure applied, estimate that 50% is available in the first year, and
then 50% of the remaining is released in each of the next two years. So, for an application rate of 100 lbs. of N as
manure, 50 lbs. would be available the first year, 25 lbs. the second, and 12.5 lbs. the third. Remember to check with
your certifier on the days-to-harvest interval when using raw manure and allow a minimum of 120 days between
application and harvesting. To prevent run-off, do not apply raw manure to bare ground in established strawberry
plantings.
Estimate that between 10% and 25% of the N contained in compost will be available the first year. It is important to
test each new mix of compost for actual amounts of the different nutrients available. Compost maturity will influence
how much N is available. If the material is immature, more of the N may be available to the crop in the first year. A
word of caution: Using compost to provide for a crop’s nutrient needs is not generally a financially viable strategy.

The total volume, trucking, and application can be very expensive for the units of N available to the crop. Most
stable composts should be considered as soil conditioners, improving soil health, microbial diversity, tilth, and
nutrient retaining capacity.
Add together the various N values from these different organic sources to estimate the N supplying potential of the
soil. There is no guarantee that these amounts will actually be available in the season, since soil temperatures, water,
and crop physiology all impact the release and uptake of these soil nutrients. If early in the organic transition, a
grower may consider increasing the N budget supply by 25%, to help reduce some of the risk of N being limiting to
the crop. Remember that with a long-term approach to organic soil fertility, the N mineralization rates of the soil will
increase. This means that more N will be available from organic amendments because of increased soil microbial
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activity and diversity. Feeding these organisms different types of organic matter is essential to helping build this type
of diverse biological community and ensuring long-term organic soil and crop productivity.
The annual nitrogen guidelines for strawberries are outlined in Table 6.6. Use leaf analysis for determination of
nutrient status in established plantings, and adjust nitrogen fertilization accordingly (see section 6.1). The primary
challenge in organic systems is synchronizing nutrient release from organic sources, particularly nitrogen, with crop
requirements. In cool soils, microorganisms are less active, and nutrient release may be too slow to meet the crop
needs. Once the soil warms, nutrient release may exceed crop needs. In a long-term organic nutrient management
approach, most of the required crop nutrients would be in place as organic matter before the growing season starts.
Nutrients needed by the crop in the early season can be supplemented by highly soluble organic amendments such
as poultry manure composts or organically approved bagged fertilizer products (see Tables 6.5 and 6.7). These
products can be expensive, so are most efficiently used if applied in a 1 foot band over the plant row, splitting
applications between May and early June. Be aware that spring applications of nitrogen can greatly increase the risk
of gray mold fruit rot infections.
Table 6.7 lists some commonly available fertilizers, their nutrient content, and the amount needed to provide different
amounts of available nitrogen, adapted by Vern Grubinger from the University of Maine soil testing lab.


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Organic production of strawberries is challenging in New York State given the abundant rainfall during the growing
season leading to increased pressure from diseases, insects and weeds. However, growers in New York and the
eastern United States, through proper variety and site selection, strict attention to cultural practices and sanitation, and
increased attention paid to scouting plantings on a weekly basis to catch pest outbreaks early, have succeeded in
producing quality organic strawberries. In contrast, a failure to appreciate the risk of disease, insect and weed
development, and failure to devise and implement a season-long (and multiyear) management strategy, can lead to
serious crop and even plant losses in particular years. Successful IPM is essential to the sustainable production of
organic strawberries.
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1. Examine your strawberry operation closely. Break it down into specific plantings, or “strawberry blocks.”
2. Produce a map of each planting (or block) to record weeds, pest outbreaks, nutrient deficiencies, drainage
problems, missing plants, and any other abnormalities you find.
3. Develop a record-keeping system for each planting or block.
4. Develop a scouting plan for each block and record results.
5. Monitor and record weather factors and understand basic weather patterns of the area.
6. Keep accurate records of spray applications, tools, or tactics used to manage pests.
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7. Properly maintain your spray equipment, calibrate the sprayer, select appropriate nozzles, and reduce spray
drift. Consult the Pesticide Application Technology website at Cornell University:

or the Strawberry Production Guide for the Northeast,
Midwest, and Eastern Canada, NRAES-88 available for purchase from:
8. Develop a thorough knowledge of the strawberry pests you are likely to encounter during the year. This
includes basic pest biology, symptoms or damage, whether they are a primary or secondary pest, scouting
thresholds, and the best time to apply management practices.
9. Choose a pest management strategy for the planting (or block) that is based on all of the information you’ve
gathered. Use the options that make the most sense for your operation.
10. Continue your pest management education.

Other resources available online, include:

New York State IPM website: nysipm.cornell.edu/fruits/
Cornell Fruit Resources: www.fruit.cornell.edu
New York State berry IPM insect and disease fact sheet index: nysipm.cornell.edu/factsheets/berries/
Cornell University Pesticide Management Education Program: pmep.cce.cornell.edu/
Pesticide Application Technology at Cornell University:
Elements of IPM for Strawberries in New York State www.nysipm.cornell.edu/elements/strawb.asp
Network for Environment and Weather Applications (NEWA) newa.cornell.edu
Berry Diagnostic Tool www.hort.cornell.edu/diagnostic
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Weed management is a major challenge for strawberry growers. Weeds are part of the strawberry planting ecosystem
and can compete for water and nutrients; provide alternate hosts for pests; and interfere with planting operations.
Weed growth can also alter the microclimate around plants, leading to higher disease pressure. In organic
production, site preparation prior to planting spanning 2- to 3-years to eliminate weeds through cover cropping and
cultivation will provide lasting benefits in weed control for the short-term perennial production cycle of strawberries.
Table 7.1 outlines weed management practices in strawberry plantings.

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Excellent preplant preparation with the goal of eliminating perennial weeds from the site before planting is essential.
Good preplant preparation, use of cover crops, and crop rotation help reduce weed pressure considerably.
Eliminating perennial weeds can be achieved with repeated cultivation and using “green manure” cover crops that
are plowed under prior to planting. For more information on cover crops see section 4. Keep in mind that excessive
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cultivation can lead to undesirable consequences such as soil erosion, reduced soil organic matter, and breakdown in
soil structure resulting in compaction and reduced permeability.
Minimizing weed competition during plant establishment is critical to achieve optimal plant growth and yields. Once
plants are set, regular hand weeding, hoeing, and cultivation are required throughout the first year. Do not let weeds
go to seed, and keep the surrounding area mowed to prevent weed seeds from migrating into the planting site. If a
first year planting is healthy, dense, and weed free prior to winter weed problems will be much less in subsequent
years. Some growers are planting in late May or early June at a higher density to reduce weed pressure.
Managing weeds within the row may be one of the most difficult tasks in the production of organic strawberries.
Inorganic mulches like plastic can only be used in organic production if they are removed from the soil annually.
There has been some recent research in Italy with the use of biodegradable mulch films (starch-based) that do not
need to be removed from the soil. These materials have shown promise in New York strawberry plantings.
Organic mulches can also be used as tools for weed management. They are most effective where soil moisture and
fertility are low and where low plant size restricts crop productivity. To provide adequate weed control, organic
mulches must be at least 4 inches thick. Potential organic mulches include straw, hay, sawdust, and wood chips.
Mulch matted row plantings with straw (wheat or rye works best) for winter protection, then rake the straw into the
alleyways for additional weed suppression. Straw mulch may serve as a major source of weed seed; be sure to
inspect straw before purchase. Use of straw or hay mulch between the rows for suppression of weed growth is also
an excellent method of water conservation and increasing the soil organic matter. Financial assistance to help pay for
mulch may be available from your county’s Soil and Water Conservation District office.
There are a number of mechanical, thermal and animal measures that can be used to limit the effects of weeds in a
strawberry planting. Mechanical and thermal options include fixed hoes, rotary cultivators, flamers, steamers, and hot
water applicators. Animal weeders have also been used with some success in organic plantings across the United
States. The use of weeder geese, guinea fowl, and sheep have some effectiveness, but due to food safety concerns
regarding microbial contamination of food crops from manure they should be used during the planting (non-bearing)

year only. The mechanical brush hoe, in particular, showed promise for use in matted row strawberry production.
Just two well-timed passes provided excellent seasonal weed control. The brushes moved runners back into the row,
allowing cultivation to occur later in the season compared with other implements. The resulting layer of dust created
by the implement "mulched" the field and suppressed weed seed germination.
Herbicides are applied on the basis of the sprayed area. Use the formula below to calculate rates needed. For
example, if plants are set in rows 8 feet apart and there is to be a 4-foot grass aisle between the rows and a 4-foot
weed-free strip within the row, only 50 percent of the given rate of herbicide will be required per planted acre.
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While strawberry production may be severely limited by insect pests and plant diseases, an understanding of the
factors involved in their development can ensure effective management. The development of disease and insect
damage is highly dependent on characteristics and conditions of the crop (host), the pathogen/pest population, and
the environment. These factors all must be conducive before disease development and/or considerable insect damage
will occur.

Characteristics of the host that influence disease and pest susceptibility include the host’s vigor, physiology, and
variety (genetics). Aggressiveness or virulence, abundance, and physiology are characteristics of the pest or pathogen
populations that influence their ability to cause disease or damage. At the same time, abiotic environmental
conditions such as temperature, moisture, light, and soil chemistry can affect both the host and pest and may
promote or prevent disease. Moreover, the presence, abundance and activity of natural enemies can play an
important role in determining pest status. The most successful disease pathogens and insect pests have coevolved
with their hosts over many years to incite disease and damage at the most opportune times. To successfully
minimize disease and pest damage, the relevant aspects of the host, pathogen/pest, and environment must all be
managed within specific timeframes.
Although insect pests and plant disease pathogens are vastly different in their biology, they often have enough
similarity in life history strategies to allow successful management under a single set of underlying principles. These
principles include avoidance/exclusion, eradication, and protection. They are defined below.
Avoidance/exclusion: This principle focuses on preventing pathogen introduction and minimizing factors that favor
the establishment of pests and pathogens. Several practices that exclude or limit pathogen and pest presence include
the following:
• Select sites with good soil drainage. Install tile in plantings with less than optimal drainage and/or incorporate
raised beds or berms to further promote soil drainage.
• Choose sites with good air drainage. Promote air circulation by selecting an open site, removing dead or
senescent plant material and reducing weeds; these practices allow fruit and leaves in berry plantings to dry
more quickly.
• Plant only disease free and insect free planting stock.
• Prevent rain-splash dispersal of soil particles by applying a thick layer of mulch under and around plants.
• Practice weed management as weeds can be hosts for strawberry pathogens and arthropod (insect and mite)
pests.
• Avoid planting strawberries in proximity to other crops or habitats that harbor large pathogen and/or pest
populations.
Eradication: This principle is concerned with the destruction of pathogen/pest populations. These practices include:
• Sanitation of plantings by removal of infected/infested plant material including overripe fruit, leaf litter, and
plants to eradicate pathogen and pest populations. Destruction of this material is accomplished through
burning, chipping, burying, and composting.

• Several biological control alternatives are available for insect suppression for strawberry crops including
products based on formulated Bacillus thuringiensis and insectary-reared predatory mites. Currently, no reliable
biological control tactics have been developed for strawberry diseases, although biopesticides, such as Serenade,
are available.
• Chemical application of fungicides, insecticides, and miticides may reduce pathogen and pest populations below
damage thresholds, but will rarely eradicate them.
Protection: This principle is founded on protection of plants from pathogen infection and pest damage. Practices
that protect plants by minimizing factors favoring infection and damage include the following:
• Plant strawberry varieties that are disease resistant or less susceptible to diseases of concern.
• Avoid excessive nitrogen fertilization as many pathogens, insects and mites thrive on succulent tissues.
• Keep fruit from contacting soil by use of mulch under and around the plants.
• Harvest fruit promptly and cool it to protect from fruit rots and insect infestations on overripe fruit.
• Applications of fungicides, insecticides, or miticides may protect susceptible tissues from disease and insect
damage.

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7.4 DISEASES OF PRIMARY CONCERN
Several important diseases that occur in the temperate climate of the northeastern U.S. are described below to help
growers manage them with appropriate organic practices.
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Leaf lesions begin as small, circular to irregular, reddish, or purplish spots. As they expand, lesion centers become
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shaped lesions that eventually kill the leaf. Heavy leaf infections can inhibit the production of flower buds for the
following year, predispose a plant to winter injury, and provide inoculum for infection of the fruit caps. Fruit may
also be infected in some instances.
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infections can cause a leaf to appear red or light purple and eventually to dry up and appear to have been burned
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The edges of infected leaves roll up, sometimes revealing a white, powdery layer of mycelium and spores on the
lower leaf surfaces. Purple to reddish blotches also occur frequently on the lower leaf surfaces. Symptoms are usually
not evident until middle or late summer. Numerous pepper-like black flecks (overwintering spore-producing
structures – cleistothecia) may appear on infected leaf surfaces in fall.

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Botrytis fruit rot usually begins as a small lesion at the blossom end or where a berry is touching another infected
berry. The infected portion is firm and brown while the berry is still green, but it expands and softens as the fruit
ripens. A powdery gray mass of spores covers infected berries if the weather remains humid and/or air circulation is
poor.
IPM fact sheet on Gray Mold (Botrytis Fruit Rot) nysipm.cornell.edu/factsheets/berries/botrytis.pdf
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