Abstract
The feasibility of using criteria for infection by Botryosphaeria obtusa, Venturia inaequalis, and Gymnosporangium juniperi-virginianae on foliage of apple (Malus × domestica) in a combined weather-based forecasting system for frogeye leafspot, apple scab, and cedar-apple rust was evaluated through computer simulation and in a field study. Ten sets of historical weather data from two locations in North Carolina were analyzed. Using a 7-day minimum waiting period between eradicant sprays, eight to 15 fungicide applications per season were required (...)
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