Abstract
Six-year-old Bing cherry trees (Prunum avium) were artificially infected withCytospora cincta in late spring and groups of these trees were re-infected at intervals throughout the growing season to determine the effect of primary infections on secondary infections and the effect of secondary infections on primary infections. Results indicated that primary infections can have a significantly depressing effect on expansion rates of secondary infections initiated in late spring and fall but not during the summer. Numerical differences indicated that secondary infections might influence primary infections also.
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