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Apple Scab Symptoms Starting to Appear
This article was published originally on 6/9/2010
The cool, wet weather we have experienced this spring has created ideal conditions for the development of apple scab on susceptible crabapple and apple trees. Apple scab is caused by the fungus Venturia inaequalis. Symptoms appear in early spring as nearly circular, velvety, olive-green spots on both the upper and lower sides of the leaves. The spots eventually turn dark-green to brown and develop a rough texture (See below). Affected leaves will turn yellow and fall from the tree. Heavily infected trees may lose nearly all of their leaves by early summer. Fruit develop black, rounded, rough-textured spots.