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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2018, Volume : 6, Issue : 3
First page : (483) Last page : (489)
Article doi: :

Studies on Epidemiology and Disease Development of Cucumber Powdery Mildew

Parameshwar Naik H.* and Shripad Kulkarni and Naik

Department of Plant Pathology, College of Agriculture, UAS, Dharwad-580005, Karnataka
*Corresponding Author E-mail:
Received: 18.04.2018  |  Revised: 26.05.2018   |  Accepted: 7.06.2018  



Powdery mildew is very important foliar disease of cucumber among major cucurbits growing areas of Karnataka which results in huge economic loss. Disease first appear on the leaves thirty days after sowing and continue to produce white mycelial growth on various aerial plant parts up to the harvest. To establish relationship between environment factors and disease development present study has been conducted. Results reveals that among different dates of sowing, second fortnight of August recorded maximum disease severity and first fortnight of July resulted in least severity and all the dates of sowing are significantly correlated negatively with weather parameters. Relative humidity and temperature were positively correlated whereas rainfall and number of rainy days are negatively correlations. In lab conditions Maximum per cent conidial germination of 48.52 per cent was observed at 25 0C, and at 30 0C observed 46.12 per cent which are on par with each other from temperature levels tested. Among the relative humidity levels tested maximum conidial germination of 46.72 per cent was observed at 85 per cent relative humidity, which was significantly superior to other treatments. Relative humidity of 90 percent was the next best treatment with 41.86 per cent conidial germination.

Key words: Cucumber, Epidemiology, Powdery mildew, Karnataka, India.

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Cite this article: Naik, P.H. and Kulkarni, S., Studies on Epidemiology and Disease Development of Cucumber Powdery Mildew, Int. J. Pure App. Biosci.6(3): 483-489 (2018). doi: