potato 5-9-12 CLEAN - Vegetableipmasia.org

ORGANIC POTATO PRODUCTION and shriveled areas on the surface of the tubers. The rot may extend to the center of the tuber and contain a fungal growththat is pink, white, or yellow. Soft rot bacteria can colonize dry rot lesions, making diagnosis difficult. The fungus originates incontaminated seed or infested soil. See Cornell general HUfact sheetUH (Reference 55) and dry rot HUfact sheetUH (Reference 58) forphotos and more information.Relative risk: Dry rot occurs annually and is perhaps the most important cause of post harvest potato losses in thenortheastern United States.Management Option Scouting/thresholds Site selection Resistant varieties Seed selection/treatment Harvest /postharvest Crop rotation/Sanitation Recommendation for Fusarium Dry Rot Inspect seed for Fusarium dry rot before purchasing. If necessary, grade out affected tubers before cutting seed. To reduce disease spread, plant seed in warm ground and cover with as little soil as practical. Avoid fields with a history of Fusarium dry rot. No resistant varieties are available. Purchase seed with no dry rot. Seed becomes more susceptible as the storage season progresses. Warm seed to at least 50°F before handling and cutting to minimize injury and promote growth. Bruising the seed during handling spreads the disease. Protect seed from wind and sunlight during planting because dehydration weakens seed. Cut only as much seed as can be planted in 24 hours. Cut with sharp knives and disinfect seed cutting and handling equipment often. Always disinfect between seed lots. Do not mix seed lots. Harvest tubers after skins are set and when pulp temperature is greater than 50°F. The fungus infects through wounds at harvest. Avoid injuries to the tuber and provide conditions for wound healing in storage (55° to 60°F and 95 percent relative humidity with good ventilation) for two to three weeks. Following the curing period, temperatures should be kept as low as possible. Do not move potatoes unnecessarily during storage because new wounds will spread the disease. These are not currently viable management options. 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 12.2 Pesticides Labeled for Management of Fusarium Dry Rot Class of Compounds Product Name (active ingredient) BIOLOGICAL Actino-­‐Iron (Streptomyces lydicus WYEC 108) Product Rate 10-­‐15 lb/A (in-­furrow)PHI (days) REI (hours) Efficacy Comments -­‐ 4 ? Water in after application. ActinoGrow (Streptomyces lydicus WYEC 108) 1-­‐12oz/A drench 2-­‐18oz/100lb seed* 0 1 or when spray has dried ? *can be applied to seed in a slurry or dry in planter box. Actinovate AG (Streptomyces lydicus) 1-­‐12 oz./10 to 200 gal water per acre (soil treatment) 0 1 or until spray has dried ? Reapply every 7-­‐14 days. Use as in furrow/soil drench or foliar spray. MycoStop Mix (Streptomyces griseoviridis str. K 61) 7.6-­‐30 oz/A as soil spray or drench 0.5-­‐1 lb/ treated acre as band, in-­‐-­‐ 4 ? Use at planting; no pre-­‐harvest interval noted. Irrigate within 6 hours after soil spray or drench with enough water to move Mycostop 282012