Author(s):

Saurabh Dubey, Md. Minnatullah, Shivam Maurya, CS Chaudhary, SP Singh and Bipin Kumar

Abstract: Agro-climatic conditions influence the crop growth and nutrient use efficiency. A mean temperature of 28 to 32 ⁰C and relative humidity of 70-85 percent is best suited for the growth of sugarcane. Several factors which are responsible for the incidence of the disease in which different weather parameters also play a crucial role in determining the cause and severity of the disease. Thus, the present study was undertaken to find out the effect of weather on incidence of red rot disease caused by Collectotrichum falcatum Went in sugarcane at SRI, Pusa farm during cropping season of 2018. The maximum temperature ranged from 22.5 ⁰C to 36.9 ⁰C and minimum temperature ranged from 7.3 °c to 26.6 °c during the crop season. The maximum (25.5 %) disease incidence occurred during second fortnight of August. Weather parameters corresponding to this period were maximum and minimum temperature (33.1 and 26.4 ⁰C), relative humidity at 07 and 14 hours (88.0 and 74.0 %), rainfall (115.8 mm) and sunshine (2.4 hours). Minimum temperature, relative humidity at 14 hours and rainfall showed positive correlation (r = 0.512, 0.45 and 0.73) respectively whereas, sunshine showed negative correlation (r = -0.42) with disease incidence. Multiple linear regression also revealed that all weather parameters together governed 68.8% towards disease incidence (R²= 0.688). Thus, the minimum temperature, relative humidity and rainfall showed statically significant positive weather correlation with disease incidence and these weather parameters appeared to be most significant contributing condition for red rot disease development.

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