Katan, T., Div. of Plant Pathology, ARO, The Volcani Center, Bet Dagan, Israel

Failures to control gray mold with vinclozolin and iprodione in cucumber greenhouses in Israel, during the winter and spring of 1981, were attributed to the development of resistance to dicarboximide fungicides in populations of Botrytis cinerea Pers. In seven out of eight greenhouses where resistance had been found in 1981, most or all of the B. cinerea population was resistant also in January 1982. This demonstrates the capability of resistant strains to survive during the warm and dry Mediterranean summer, and to provide competitive inoculum for crop infection in the subsequent winter. © 1982 Springer Science + Business Media B.V.