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A study was conducted in Karnataka, India from 2013-14 at College of Agriculture, Bijapur, (UAS, Dharwad) to know the effect of weather parameters in seven dates of sowing from I Fortnight (FN) July to I FN of October on sunflower powdery mildew. Weather correlations in I FN July dates shown significant positive impact of cloud cover at 20-1 days before observation (DBO) on the powdery mildew incidence, highly significant parameters that affected the powdery mildew at 20-16 DBO were minimum temperature (- 0.95) as well as maximum temperature (0.98) and maximum vapour pressure at (-0.95) at 5-1 DBO. | Relationship between weather parameters and sunflower powdery mildew Erysiphe cichoracearum DC in various sunflower sowing dates