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 |
Collar rot disease caused by Sclerotium rolfsii Sacc. is one of the most important disease of sunflower in India. In the changing climate, this disease in sunflower has been recognized as a major threat in causing more economic loss than before. Environmental parameters such as relative humidity, temperature, bright sunshine hours and rainfall have been shown to influence infection and subsequent damage caused by S. rolfsii. Keeping this in view, experiment on epidemiology of collar rot of sunflower (Helianthus annus L.) caused by Sclerotium rolfsii Sacc. was conducted under field conditions at research farm of CCS, Haryana Agricultural University, Hisar in 2014-2015.The maximum disease incidence was found during 1st date of sowing followed by 3rd date of sowing on two different hybrids HSFH-1183 and Pioneer 64A57 varied from 30.6-36.4 per cent and least disease incidence was recorded during 2rd date of sowing varied from 19.8-21.8 per cent on the same hybrids. Present investigations indicate that sunflower sown by mid July was good to protect the crop from collar rot disease under present conditions. Correlation matrix for the development of collar rot disease in relation to weather variables also revealed that minimum temperature had negative and significant correlation with the disease incidence in both hybrids and during all the three dates of sowing, whereas relative humidity morning had negative and significant correlation during third date of sowing, but negative and non significant correlation during first two dates of sowing. Rainfall had negative but non significant correlation with the disease incidence. Maximum temperature had positive and non significant correlation with the disease incidence during first two dates of sowing but positive and significant correlation during 3rd date of sowing in both hybrids. Sunshine hours had also positive and non significant correlation with the disease incidence during 1st and 2nd date of sowing, but positive and significant correlation during 3rd date of sowing in both hybrids.
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