International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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Original Research Articles                      Volume : 7, Issue:9, September, 2018

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : /
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2018.7(9): 3495-3502

Relationship between Weather Parameters and Sunflower Powdery Mildew (Erysiphe cichoracearum DC) in Various Sunflower Sowing Dates
A. Bheemaraya, M.M. Jamadar and Shalini Huilgol
Department of Plant Pathology, College of Agriculture, Bijapur, University of Agricultural Sciences, Dharwad – 580 005, Karnataka, India
*Corresponding author

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.

Keywords: Dates of sowing, Powdery mildew (Erysiphe cichoracearum), Weather parameters

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How to cite this article:

Bheemaraya, A., M.M. Jamadar and Shalini Huilgol. 2018. Relationship between Weather Parameters and Sunflower Powdery Mildew (Erysiphe cichoracearum DC) in Various Sunflower Sowing Dates.Int.J.Curr.Microbiol.App.Sci. 7(9): 3495-3502. doi:
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