Abstract
Epidemics of potato late blight progressed more slowly in plots of intermediate-aged plants than in plots of older plants. The suppression of epidemics achieved by intermediate-aged plants relative to old ones was equivalent to the suppression achieved by weekly applications of chlorothalonil of as much as 0.30 kg a.i./ha. The age effect on epidemic development was most noticeable for late-season cultivars and least noticeable for early-season cultivars.
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