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 |
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. The weather correlations in II FN July date of sowing indicated highly significant negative relation of minimum temperature (-0.88) at 20-1 DBO, At 5-1 DBO evening relative humidity (0.81) showed positive relationship. Correlations of weather parameters in I FN August sowing date indicated that at 20-1 DBO all the weather showed negative and highly significant relationship except cloud cover (0.83) which was positive and significantly correlated. Interestingly rainfall (-0.84) indicated negatively significant relationship with powdery mildew severity. The weather correlations in II FN August sowing indicated that at 20-1 DBO highly significant negative relationship with most of weather parameters but rain fall (-0.79) significant and negative at 20-1 DBO. Crop sown in I FN of September revealed At 20-16 DBO none of the weather parameters had the significant influence on the powdery mildew intensity except maximum temperature (-0.83) which was significantly negatively correlated, here rainfall (-0.85) was significant and negatively affected the powdery mildew severity. In II FN September sowing indicated that highly significant and negative relation of maximum temperature (-0.95) among all the weather variables on powdery mildew intensity at 5-1 DBO. Powdery mildew severity in I FN October sown crop were observed except morning relative humidity (-0.78) at 20-1 DBO and maximum temperature (0.88) at 20-16 DBO.
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