Abstract
Seed tubers of susceptible and moderately resistant cultivars were inoculated withPhytophthora infestans and planted in a field in four trials over three years. After emergence, the foliage was periodically examined for late blight lesions. For the four trials, blight was first observed 9, 5,4, and 4 days after the accumulation of 18 severity values supporting the use of severity values for the prediction of initial appearance of blight as used in Blitecast. The first observance of blight followed a period of consecutive days which were favorable for blight development and ranged from 17 to 46 days after median emergence. Lesions were observed on foliage of the susceptible cultivars before detection on moderately resistant cultivars for three out of four trials. We conclude that late blight will usually, but not always, appear in susceptible cultivars before it appears in moderately resistant ones.
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