Status and etiology of Cercospora leaf spot of greengram in Kashmir province of India
DOI:
https://doi.org/10.59797/jfl.v32i1.700Keywords:
Cercospora canescens, Etiology, Epidemiology, Green gram, Leaf spotAbstract
Green gram fields were surveyed in ten geographical blocks distributed from north to south of Kashmir valley at 1580 to 2000 meters above sea level and Cercospora leaf spot was found predominant disease ranged 6-28 per cent leaf area. Maximum disease was recorded in Lalpora (26-31%) followed by Shalimar with disease intensity of 26-30 per cent. Conidia of the fungus were hyaline, straight to sub-straight or slightly curved, obclavate-cylindric, 40.2-180.3 × 2.5-3.4 μm with an average of 102.8 × 3 μm having 1-14 septa. The diagnostic symptoms comprised of roughly circular to irregular, white centered reddish brown to brown leaf spots measuring 2-12 mm in diameter. Under natural epiphytotic conditions minimum disease (2-5%) was recorded during 1st week of august which picked up later and reached 42-44 per cent by 1st week of october. Higher values of periodic disease (6-9%) coincided with average maximum temperature 27-30oC, minimum temperature 10-16oC, RH 82-84 per cent and periodic rain of 2-34 mm. While maximum temperature, RH and rain persay masked their statistical significance by fluctuating around respective optima, the influence of minimum temperature on disease was, however, statistically significant for the period between 4th week of July and 2nd week of September.
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