Co-Authors:
Palti, J., Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Abstract:
Pseudoperonospora cubensis is common throughout the world on Cucumis crops (cucumber, melon); less common on Cucurbita crops (squash, pumpkin, marrow), from which it is absent in Europe and parts of Asia; and more restricted on Citrullus, Luffu and Lagenaria spp. This divergence in distribution is due chiefly to different physiological races in various countries. This must be taken into account in quarantine and breeding work. Resistance of some local cultivars, and the differential effects of environment on infection, add to the uneven distribution. © 1974 Springer Science + Business Media B.V.
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