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Monitor Your Forecast for Pome Disease Threats

May 3, 2019
this agronomic image shows apple scab.

Moderate temperatures across the Northeast may lead a protracted bloom season. Such steady and mild temperatures create favorable conditions for disease development in pome fruit. With bloom around the corner, keep a close eye on your growth conditions and weather forecasts as you evaluate your insect and disease management needs. Below you’ll find considerations for Northeast growers to ensure maximum growth and fruit quality.

Preventing Apple Scab

Trees are under the maximum risk for scab between pink and petal fall. When left unmanaged, apple scab will cause significant damage. As bloom nears, protect your fruit with a fungicide application. We recommend a management program including Aprovia® fungicide for control of apple scab and other diseases. If apple scab is your primary concern, apply Aprovia between bloom and petal fall 7 to 10 days or within 48 hours of forecast of infection.

Preparing for Fire Blight

Temperatures before and during bloom can best predict fire blight intensity. According to Penn State University, daily temperatures must average 65° F or above from pink through petal fall to cause severe disease. With a moderate prolonged bloom season predicted in the Northeast, protection against fire blight protection starts now.

For fire blight susceptible trees, Actigard® plant activator is recommended. Implementing a management program that includes Actigard and traditional antibiotics can help the plant protect itself against attacks from diseases. Triggering the tree’s natural defense system, Actigard works much like a vaccine.

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