![]() Severe infection can result in partial defoliation of the tree. These fruiting bodies occur in greater numbers on the upper leaf surface. Black fruiting bodies of the fungus develop in a circle in the centers of the spots. The spots are irregularly round and ¼ inch in diameter. On the leaves, spots appear with pale yellow centers and purple borders. Phyllosticta Leaf Spot: This disease, also known as purple eye, is caused by the fungus Phyllosticta minima. Phyllosticta leaf spot of maple ( Phyllosticta minima). A certified arborist should be contacted if chemical control is needed. The disease has been suppressed by oxytetracycline injections but not cured. Incorporate organic soil amendments into the soil to improve aeration and drainage of clay soils or to improve the water holding capacity of sandy soils. Prevention & Treatment: In general, practices that encourage root development and root function are recommended. The bacteria are transmitted by leafhopper feeding, through roots grafts between trees, and vegetatively through propagation grafts and cuttings. The symptoms are most noticeable in late summer to early fall, following extended periods of drought. Diseased trees lose vigor, and branches or entire trees may eventually die. Presumably, the symptoms develop because of water stress within the water-conducting vessels. Symptoms often start out as marginal chlorosis or yellowing of the leaves before they fade to a drab green or brown color.
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