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ORGANIC POTATO PRODUCTION Scouting fields weekly is key to early detection andevaluation of control measures. The earlier a disease isdetected, the more likely it can be suppressed with organicfungicides. Accurate identification of disease problems,especially recognizing whether they are caused by abacterium or fungus, is essential for choosing an effectivecontrol strategy. Anticipate which diseases are likely to beproblems and be ready to take control action in a timelymanner. Allowing pest populations to build past thresholdscan leave few or no options for control. Thresholdspresented here were developed for use with conventionalfungicides, and may need to be adjusted downward whenusing materials approved for organic production, which tendto be less effective and have shorter residual activity.When available, scouting protocols can be found in thesections for each individual disease. While following asystematic scouting plan, keep watch for other diseaseproblems when walking a field.All currently available fungicides allowed for organicproduction are protectants meaning they must be present onthe plant surface before disease inoculum arrives toeffectively prevent infection. Biological products must behandled carefully to keep the microbes alive. In additionto disease control, fungicides containing copper may haveantifeedant activity against some insect pests including theColorado potato beetle. Follow label instructions carefullyto achieve the best results.Use weather-based disease forecasting programs whenavailable to help time applications to periods of favorableweather or the arrival of inoculum. The movement of somepathogens that do not overwinter in the Northeast may betracked online to help determine when control measures areneeded. Contact New York State IPM’s network for theenvironment and weather (Reference 4) for late blightforecasting in your area.Contact your local cooperative extension office to see ifnewsletters and pest management updates are available foryour region, for example, the Cornell Cooperative ExtensionRegional Vegetable Program in Western New York offerssubscriptions to Pestminder, a report that gives timelyinformation regarding crop development, pest activity andcontrol, and VegEdge, a monthly newsletter with articles onpest management. In the Albany area, information isavailable through the weekly Vegetable Pest Status Report.Organic farms must comply with all other regulationsregarding pesticide applications. See Section 11: UsingOrganic Pesticides for details. ALWAYS check with yourorganic farm certifier when planning pesticideapplications.Resources: Cornell Vegetable MD Online (Reference 57). Resource Guide for Organic Insect and Disease Management (Reference 2). 242012
ORGANIC POTATO PRODUCTION At the time this guide was produced, the following materials were labeled in New York State for managing this pest and were allowable for organic production. Listing a pest on a pesticide label does not assure the pesticide’s effectiveness. The registration status of pesticides can and does change. Pesticides must be currently registered with the New York State Department of Environmental Conservation (DEC) to be used legally in NY. Those pesticides meeting requirements in EPA Ruling 40 CFR Part 152.25(b) (also known as 25(b) pesticides) do not require registration. Current NY pesticide registrations can be checked on the Pesticide Product, Ingredient, and Manufacturer System (PIMS website) http://pims.psur.cornell.edu/ (Reference 3). ALWAYS CHECK WITH YOUR CERTIFIER before using a new product. Table 12.1.1 Pesticides Labeled for Organic Potato Disease Management. BACTERIAL SOFT ROT, Erwinia spp. FUSARIUM DRY ROT Fusarium spp.EARLY BLGHT Alternaria solani LATE BLIGHT Phytoph-thora infestans VERTICIUM WILT FUSARIUM WILT CANKER AND BLACK SCURF Rhizoctonia solani BOTRYTIS VINE ROT CLASS OF COMPOUNDS Product Name (active ingredient) BIOLOGICALS ActinoGrow (Streptomyces lydicus) c a, b c a, b a, b a, b a, b c a, b, c a, b a, b Actino-‐Iron (Streptomyces lydicus) a, b b b b b b b b Actinovate AG (Streptomyces lydicus) c b, c c b a, b a, b a, b b, c b, c a, b, c a, b, c Agri-‐mycin 17 (Streptomycin sulfate) a Bio-‐Save 10LP (Pseudomonas syringae) d d Contans WG (Coniothyrium minitans) b MycoStop Biofungicide (Streptomyces griseoviridis) a, b a, b a, b MycoStop Mix (Streptomyces griseoviridis) a, b a, b a, b Prestop Biofungicide (Gliocladium catenulatum Str. J1446) b b b b b b b b b b Regalia Biofungicide (Reynoutria sachalinensis) c c c Rootshield WP (Trichoderma harzianum st T-‐22) a, b a, b a, b a, b Serenade ASO (Bacillus subtilis) c c c c Serenade MAX (Bacillus subtilis) c c c c Serenade Soil (Bacillus subtilis) b b b b b b b b SoilGard (Gliocladium virens str. GL-‐21) b b Sonata (Bacillus pumilis) c c c Taegro Biofungicide (Bacillus subtilis var. amyloliquefaciens str.n FZB24) a, b a, b a, b T-‐22 HC (Trichoderma harzianum) a a a a BOTANICALS Pure clove oil (clove oil 1)d Sporan (rosemary oil) c c Sporatec (rosemary, clove and thyme oils) c c Trilogy (hydrophobic extract of neem oil) c c c c c COPPERS eBadge X2 (copper oxychloride, copper hydroxide) c c Basic Copper 53 (copper sulfate) c c Camelot O (copper octanoate) c c Champ WG (copper hydroxide) c c *Copper Sulfate Crystals (copper sulfate pentahydrate) c CS 2005 (copper sulfate pentahydrate) c c Cueva Fungicide Concentrate c c WHITE MOLD COMMON SCAB PINK ROT POWDERY SCAB PYTHIUM LEAK SILVER SCURF i VIRUSES 252012
Page 1 and 2: 2012Production Guide forOrganic Pot
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Page 18 and 19: Table 6.1.3 Potato Variety Culi
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