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 |
Increase in disease severity index (DSI) of early blight of tomato was comparatively higher in the maximum and minimum temperatures (35.2 – 38.30C), Evening RH (30-58 %) and wind speed (1.2–2.2 km/hr) during 41th to 46th Standard meteorological week (SMW), which were most congenial for disease development. The abiotic factors like minimum temperature (r= 0.90) and evening relative humidity(r= 0.77) were negatively highly correlated, while maximum temperature (r= 0.59) had negative significant impact on alternaria leaf blight of tomato. Wind speed showed positive and highly significant effects (r= 0.69) on development of early blight. The partial regression between leaf blight and abiotic factors indicated that an increase in 10C in maximum temperature, an increase in 1 km/hr wind speed and one per cent in evening RH, increase the early blight to the tune of 3.62, 6.56 and 0.14 DSI, respectively. The value of coefficient of determination (R2) indicating 88.45 per cent variation in disease severity of weather factors in tomato crop. The severity of early blight of tomato progress with increase in maximum temperature and wind speed whereas it declined with increase in minimum temperature on tomato.
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