beans 4-24-12 CLEAN - Vegetableipmasia.org

ORGANIC SNAP BEAN PRODUCTION
Management Option
Scouting/thresholds
Coverage
Resistant varieties
Crop rotation
Site selection
Planting
Fertilization
Postharvest
Seed selection/treatment
Note(s)
Recommendations for Botrytis Gray Mold
Botrytis cinerea can infect many species of plants. A reliable forecasting system has not been
developed for gray mold on beans. However, here are a few helpful hints on the development of
gray mold. Gray mold tends to develop in dense plant canopies. The disease tends to be worse in
fields where leaves have mechanical damage and where dead leaves are on the ground. The
fungus grows and produces spores on dead and living material. These spores will subsequently
infect bean pods. Gray mold tends to develop when the weather is warm and moist. Begin
scouting when the first buds are showing. Record the occurrence and severity of gray mold. See
Reference 5.
The best coverage can be obtained by using a minimum of 50 gallons per acre and high pressure
(100 to 200 psi).
No resistant varieties are available.
Regular crop rotation is recommended. Grains and corn are good rotation crops.
Avoid planting in shaded areas and in small fields surrounded by trees; do not plant in fields that
drain poorly.
Plant rows in an east-­‐west direction, and use wide row spacing (36 inches) to promote drying of the
soil and reduce moisture in the plant canopy.
Avoid over-­‐fertilization with nitrogen.
Incorporate debris immediately after harvest to hasten decomposition of the material.
This is not currently a viable management options.
Avoid mechanical damage to leaves.
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 (Link 2). ALWAYS CHECK WITH YOUR CERTIFIER before using a
new product.
Table 11.2 Pesticides Labeled for Management of Botrytis Gray Mold
Class of Compound
Product
(Active ingredient)
BIOLOGICALS
ActinoGrow
(Streptomyces lydicus WYEC
108)
Rate/A
PHI
(days)
1-­‐6oz/A foliar 0 1 or when
dry
REI
(hours) Efficacy Comments
?
Actinovate AG
(Streptomyces lydicus)
Regalia Biofungicide
(Reynoutria sachalinensis)
BOTANICALS
Sporan EC
(herbal oils)
3-­‐12 oz (soil
treatment)
0 1* ? *1 hour re-­‐entry or until solution is dry.
Foliar spray must be reapplied every 7-­‐14 days
using a spreader sticker. Use as soil drench.
2 – 4 qts 0 4 ? Apply every 7-­‐14 days as needed.
1.0-­‐3.0 pts in a
minimum of 25 gal
water/A
0 0 ? exempt – 25(b)
18 2012