ABSTRACT
Downy mildew (Pseudoperenospora cubensis) is an extremely destructive disease of cucurbits, and it was first reported from Cuba in 1868. During 1985-1988, epidemics of downy mildew (Pseudoperenospora cubensis) were recorded on cucumbers in Poland grown under plastic and in the field condition. It has now been reported from Japan, England, Brazil, New Jersey, Africa, etc. In India it occurs on all the cultivated cucurbits (Rondomanski and Wozniak, 1989).
