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Not AvailableThe experimental materials consisted of 42 accessions of Cucumis spp including the wild type Cucumis hardiwickii, Cucumis sativus var sativus and SM 12735 (Bitter in taste).After calculating the PDI, the germplasm in the population was categorized into four groups namely resistant (0-25), moderately resistant (26-40), susceptible (41-60) and highly susceptible(>60). In open field screening, wild species Cucumis hardiwickii-14 and 15, Cucumis sativus var sativus and SM 12735 exhibited a high level of resistance to powdery and downy mildew diseases with 0-25 % PDI under natural conditions. Five accessions namely (IIHR-27, IIHR-35, IIHR-303, IIHR-64 and 82) had < 40 % PDI exhibited moderately resistance to PM and DM diseases and rest of the accessions showed > 60 % PDI depicting highly susceptible to both the diseases. This preliminary work must be repeated by screening all lines under artificial conditions in the glasshouse in order to confirm the results.Not Availabl