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Apple Scab Disease
GardenGuides — Apple Scab Disease. Apple scab is a fungal disease present in apple trees. According to the New York State Agricultural Experiment Station, apple scab is considered the most destructive disease of apples in the world. Th... Apple scab is a fungal ...More…
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Apple Scab
Clemson University Extension — Many diseases commonly occur on apple (Malus domestica) and flowering crabapple trees (Malus species), which can reduce flowering and the quality of the fruit in South Carolina. Planting resistant varieties is one of the best ways to reduce many ...More…
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Apple Scab, caused by Venturia inaequalis
Apple scab is of major economic importance in the mid-Atlantic region. If not controlled, the disease can cause extensive losses (70 percent or greater) where humid, cool weather occurs during the spring months. Losses result directly from fruit ...More…
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Apple Scab
NY State IPM — Wayne F. Wilcox Department of Plant Pathology, NYS Agricultural Experiment Station, Cornell University Apple scab is the most economically destructive disease of apples in the world. In the Northeast it is usually not possible to produce apples ...More…
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Apple Scab Management Guidelines
University of California IPM — Apple scab, caused by the fungus Venturia inaequalis, is generally considered a serious disease of apples in California, causing loss or severe surface blemishing of fruit. Apple scab is most severe in coastal areas where spring and early summer ...More…
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Apple Scab & Black Knot
University of Illinois Extension — Members of the apple and cherry families provide many of our common small flowering trees but each family is susceptible to a disfiguring fungal disease. During spring these two diseases may infect disease prone plants. Cool, wet weather in ...More…
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Apple Scab
University of Illinois Extension — The fungus that causes apple scab on apples and crabapples is Venturia inaequalis. There are related fungi that cause scab on other plants in the rose family. Symptoms usually start on the undersides of leaves. Spots, at first, are small, ...More…
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Stateline Yard & Garden - Apple Scab Management Starts Early
University of Illinois Extension — If apple scab has not appeared on your crabapple or apple tree the past few years, chances are it is a resistant cultivar. Apple scab first appears as olive green to black spots or lesions on leaves. As the season advances, leaves turn yellow or ...More…
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Apple Scab Management Starts Early
University of Illinois Extension — With the return of spring this week, it won't be long before trees and shrubs are again leafing out. As leaves develop in spring, certain diseases may infect some trees. One example is apple scab, a fungus disease of flowering crabapples and ...More…