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Abstract

Incidence of groundnut bud necrosis disease in Karnataka.

Abstract

This paper presents the results of a roving survey conducted in 10 major groundnut growing districts of Karnataka (India), i.e. Bagalkot, Belagavi, Ballary, Chitradurga, Dharwad, Gadag, Haveri, Koppal, Raichur and Tumkur, to determine the incidence of groundnut bud necrosis disease during the kharif 2012 and rabi/summer 2012-13 seasons. A total of 123 villages in the 10 districts were surveyed during kharif 2012. The highest bud necrosis disease incidence of 19.09% was recorded in Raichur, followed by Koppal (16.0%), whereas the lowest incidence of 8.2% was observed in Dharwad. During the rabi/summer 2012-13, 86 villages in the 10 districs were surveyed. The highest incidence of 24.0% was recorded in Raichur, followed by Tumkuru (20.1%), whereas the lowest incidence of 10.5% was recorded in Dharwad. The highest mean incidence of 21.6% was recorded in Raichur, followed by Koppal (17.9%) and Tumkuru (17.1%). The least incidence of 9.4% was recorded in Dharwad. In both kharif 2012 and rabi/summer 2012-13 seasons, groundnut was grown on red and black soil types. The highest mean incidence of 15.8% was recorded in red soil fields compared to black soil (12.7%) fields. The crop at maturity stage recorded the highest mean incidence of 17.5% compared to pod filling stage (12.8%) and in the irrigated fields (16.0%) compared to rainfed (12.8%) conditions. The incidence of bud necrosis increased with increase in latitude, longitude and decrease in elevation.