potato 5-9-12 CLEAN - Vegetableipmasia.org

ORGANIC POTATO PRODUCTION Management Option Harvest Postharvest Storage Notes Recommendation for Bacterial Soft Rot Avoid injuries to tubers during harvest and avoid harvesting when soil temperatures are higher than 70°. Provide good conditions for wound healing (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. Severely affected tuber lots should not be stored. Do not move potatoes unnecessarily during the storage period because new wounds will be created. Soft rot bacteria can also act as secondary pathogens in tubers infected with other diseases. Tubers grown with excessive amounts of nitrogen are very susceptible to soft rot. 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 Pesticides Labeled for Management of Bacterial Soft Rot Class of Compounds Product Name (active ingredient) SEED TREATMENT Agri-­‐mycin 17 (streptomycin sulfate) FOLIAR TREATMENT AND DRENCH ActinoGrow (Streptomyces lydicus WYEC 108) Product Rate 4 oz/50 gal water or 100 ppm PHI (days) 1-­‐6oz/A foliar 0 1 hour or when spray has dried REI (hours) Efficacy Comments -­‐ 12 ? From label: soak cut seed pieces in streptomycin solution for several minutes; plant as usual ? Only labeled for foliar treatment for this disease. Actinovate AG (Streptomyces lydicus WYEC 108) 3-­‐12 oz/A foliar 0 1 ? Label recommends using a spreader sticker for foliar applications. PERpose Plus (hydrogen peroxide/dioxide) POST HARVEST TREATMENT StorOx 2.0 (hydrogen peroxide/peroxyacetic acid) 1 fl oz/Gal (initial/curative) 0.25-­‐0.33 fl oz/gal (weekly/preventative) 5-­‐ 1 1/4 fl. oz/gal of water (newly harvested) -­‐ 1 (interior); until dry (field) ? For initial or curative use, apply higher rate for 1 to 3 consecutive days. Then follow with weekly/preventative treatment. For weekly or preventative treatments, apply lower rate every five to seven days. At first signs of disease, use curative rate then resume weekly preventative treatment. 0 0 ? For newly harvested potatoes, apply to runoff achieving full and even coverage. Use 1 to 2 gallons of water per ton of potatoes. 1 ¼ -­‐ ½ fl. oz/gal water (storage humidification water) PHI = pre-­‐harvest interval, REI = restrictedentry interval. -­‐ = pre-­‐harvest interval isn't specified on label. Efficacy: 1-­‐ effective in half or more of recent university trials, 2-­‐ effective in less than half of recent university trials, 3-­‐not effective in any known trials, ?-­‐ not reviewed or no research available 12.2 Fusarium Dry Rot primarily Fusarium sambucinum, but also F. coeruleum and F. graminearumTime for concern: During planting, harvest, and postharvest, if soil is cold and pathogen is present.Key characteristics: Fusarium spp. fungi cause dry rot in stored tubers and seed piece decay. Symptoms include sunken272012