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Management Strategies for Optimizing Summer Fungicides Applied to Apples In New York's Upper Hudson And Champlain Regions 1997

Project Leader: Kevin Iungerman


1. Validate the degree-day model for predicting the end of the primary scab season.

2. Evaluate/revise/validate the NY flyspeck model for timing summer fungicides in northeastern NY.

a. Establish weather stations at each test site to monitor leaf wetness, an essential parameter for driving the flyspeck model.

b. Compare the growers' conventional fungicide program, a model-driven IPM summer fungicide program, and control treatment receiving no summer fungicides on at least four commercial farms.

c. Compare high-inoculum and low-inoculum sites on each farm to determine whether the flyspeck model should be adjusted to compensate for predicted inoculum levels.

3. Use and evaluate Sky-Bit temperature data for model components that require temperature inputs.

4. Use participating orchards as field meeting sites, and develop presentations for grower meetings relevant to technology transfer.


Temperature data collected for each site were redundant. Fruit samples from all orchards disclosed no differences in incidence of sooty blotch and flyspeck between plots close to natural sources of inoculum and plots distant from them. This may be due to low disease pressure and relatively dry conditions. IPM treatments generally resulted in one or more fewer fungicide applications than conventional treatments applied this season in the same orchards. Future replications of the research under wetter conditions would be desirable.