National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Sunflower (Helianthus annuus L.) is native of southern USA and Mexico. Among the different diseases on sunflower; the powdery mildew caused by Erysiphe cichoracearum DC has been serious diseases in northern Karnataka causes sever losses in present climate change situation. Hence the experiment is carried out in 2013-14 at College of Agriculture, Bijapur, to know the effect of weather parameters in seven dates of sowing on sunflower powdery mildew. Sunflower crop sown in I fortnight of October recorded maximum disease severity (39.64 %) followed by II fortnight of September (74.07%) and the least (8.80%) recorded in II fortnight of July sown crop. Maximum and minimum temperature, maximum and minimum vapour pressure and both morning and evening relative humidity had significant negative correlations with disease in irrespective of different crop growth periods (40, 60, 80 and 100 days after sowing). Marked significant positive correlation of cloud cover was noticed with disease intensity at 40, 60 and 80 days crop growth stages. However, rainfall was negative but non-significant in its relationship with powdery mildew infection.
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