Co-Authors:
Leibovich, G., Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P. O. Box 90000, Haifa 31-900, Israel
Cohen, R., Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P. O. Box 90000, Haifa 31-900, Israel
Paris, H.S., Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P. O. Box 90000, Haifa 31-900, Israel
Abstract:
Powdery mildew development was assessed on squash (Cucurbita pepo) plants of a susceptible cultivar, a resistant accession, their F1, and their F2 in an early summer planting in the field, covered or not covered with a shading net. Three reaction types were observed: susceptible, powdery mildew on stems and on both, the upper and lower leaf surfaces, as in the susceptible parent; resistant, no powdery mildew on leaves or stems, as in the resistant parent; and partially resistant, powdery mildew on upper leaf surfaces only, as in the F1. Disease presence on the stem was associated with susceptibility. Shading hastened the appearance of powdery mildew and increased the severity of infection on partially resistant and susceptible plants, facilitating identification of resistant individuals in the F2 population.
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