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Scab on Crabapples
This article was published originally on 6/9/1995Why are the leaves falling from my crabapple? This has been a common question. The answer in most cases is scab. Scab is a disease caused by the fungus Venturia inaequalis. In early stages, spots on occur on leaves as small olive-green to black areas. The spots may coalesce, especially along the midvein of the leaf. Infected leaves will eventually turn yellow and fall from the tree. The extended wet conditions this spring have favored the development of the disease.
To diagnose scab, examine fallen leaves or the leaves remaining on the tree for the presence of leaf spots. The disease is called scab because infected fruit on apple trees typically show raised brown areas that have a scabby appearance.
To control scab:
Year of Publication:
IC-470(14) -- June 9, 1995