a disease of stone fruit trees caused by the imperfect fungus Clasterosporium carpophilum. It affects the foliage and aboveground parts of the plant, appearing in the form of spots. On shoots and branches the spots are round at first, then become elongated and cracked and develop into wounds and sores that ooze gum. On leaves they are round spots with light brown to reddish brown borders that fall off. On fruits they are red, reddish brown, or brown, and either wartlike or flat. On sweet and tart cherries the fungus causes the fruit pulp to dry.
Clasterosporiosis is encountered throughout the USSR, causing the heaviest damage in southern regions to apricots and peaches. Countermeasures include cutting and burning infected shoots and branches and treating the plants with fungicides.