Natural Inoculation of Apple Buds byBotryosphaeria obtusa

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Abstract
Black rot, caused by B. obtusa, is a major disease of apples in Georgia [USA]. Inoculum was found on and in buds as early as Oct. and reached levels as high as 77% at the silver tip stage. Bud infestation was evenly distributed through the tree, and was less in trees sprayed with fungicides in previous years than in trees not sprayed. There were no differences in bud infestation levels among ''Red Delicious'', ''Golden Delicious'', ''Rome Beauty'' and ''Detroit Red'' cultivars.