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Field and Growth Chamber Approach to Epidemiology of Pseudoperonospora cubensis on Cucumbers. Y. Cohen, Division of Plant Pathology, The Volcani Institute of Agricultural Research, Bet Dagan, Israel; J. Rotem, Department of Life Sciences, Bar-Ilan University, Ramat Gan, Israel. Phytopathology 61:736-737. DOI: 10.1094/Phyto-61-736.

Field experiments showed that the outbreak of epidemics caused by Pseudoperonospora cubensis on cucumbers depends more on the proximity of a given field to a source of inoculum than on the prevailing temperature. To verify other, inconclusive results reached in field work, mini-epidemics were produced in growth chambers. These epidemics confirmed that the comparative damage depends more on the rate of foliage development of the host than on the weather conditions.