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Apricots and peaches--what causes the reddish or purple-brown spots on new leaves, buds, shoots and fruit?

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A

It is called Coryneum Blight or "shot hole" disease.  It is a fungus that infests during cool, wet springs.  It first forms dark spots with brown centers on the leaves.  These centers eventually fall out, leaving a "shot-hole" appearance.  The fruit has rough, corky blemishes with a red ring around the spot.  Control includes: keeping leaves and fruit dry from sprinkler spray, proper pruning, maintaining good tree vigor and a fall clean up of debris around the base of the tree.  A fungicide maybe applied in the fall after all the leaves have fallen, again in the spring at pink bud stage, full bloom and when leaves begin to appear.
Reference: “Coryneum Blight of Stone Fruits”, at http://extension.usu.edu/plantpath/fruit_diseases/fd_coryneum_blight.htm

Posted on 13 Jun 2006

Karl Hauptfleisch
Salt Lake Master Gardener

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