Author(s):

Shikha Sharma, RS Ratnoo and HK Jain

Abstract: The experiment was conducted in department of Plant pathology research farm, RCA, MPUAT during the year 2013 to 2015 on Niger [Guizotia abyssinica (L.f.) Cass.] is commonly known as ramtil which is severely affected by blight caused by Alternaria blight. Disease progress was influenced by date of sowing and different weather factors viz., temperature, relative humidity and sunshine was carried out Results of disease progression in the year 2013 and 2015 revealed that the similar trends in both the years in all the dates of sowings. In the starting week disease increased slowly in month of July when crop was young after getting uniform temperature range of 29-32 ^oC and because of accidental rains it increased by faster rate and maximum AUDPC 147 to 289 and 180.87 to 290 was noted on 32^th to 34^th week i.e. in the month of August in the year 2013 and 2015 respectively. When crop at 40 to 60 days of age, temperature range from 29-32 ^oC, more than 70% relative humidity, more wind velocity, accidental rains which further helps in the progress of disease then in the 35^th to 39^th week disease remained more or less staple with slight up and down then from 41^th to 43^rd week AUDPC got declined.

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