Abstract
In large commercial fields, the ratio of Alternaria macrospora to A. alternata lesions was 1:0‐4 in cv. Pima and 1:19 in cv. Acala. The frequency of A. alternata on Pima and of A. macrospora on Acala increased in an experimental field with mixed Pima and Acala plots. In both cultivars disease was inhibited by fungicidal treatment and by removal of flowers. For all parameters measured (leaf area, number of leaves, flowers and bolls, and yield), the responses to treatments were greater in Pima than in Acala.
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