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 |
Occurrence and severity of Early blight of potato observed that the disease occured every year at Kanpur and Faizabad district of Utter Pradesh. It has observed that the disease was first appeared during 2–3rd weeks of December at Kanpur and 3rd weeks of December to 1st weeks of January at Faizabad district of Uttar Pradesh at the maximum temperature range 17–230C, minimum temperature 1.8–7.80C, relative humidity 46–93%, and 0–7.2 sun shine hours. The maximum severity with 28.20 per cent was noted on 24 January, 2012 after 40th days of first appearance of disease at the maximum temperature 23.0oC and minimum temperature 5.6oC, relative humidity ranges 54 -85% and sun shine hours 6.9 whereas, in the year 2013, maximum severity of 14.11 per cent on 23 January, 2013 after 41 days first appearance of disease at temperature range between 24.8oC to 8.8, relative humidity 62–90% and 7.0 sun shine hours, respectively. It has also found that infection rate increases with occurrence of rainfall, resulted high relative humidity and low sunshine hours which are optimum for growth and sporulation of the pathogen during both the year. Similar observation has also been recorded at Faizabad district of Uttar Pradesh. The co-relation between disease severity with temperature, relative humidity and sunshine hours were calculated by standard statistical calculation and the results showed that disease severity co-relate negatively with temperature (- 0.17845, - 0.51214) and sunshine hours (-0.04185, - 0.70934) and positive correlation with relative humidity (0.638215, 0.149054) at Kanpur during 2011 -2012. Similar observation has also been recorded in both the year at Faizabad.
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