Survey for the powdery mildew of black gram [Vigna mungo (L.) Hepper] in parts of Northern Karnataka, India.

Abstract

Powdery mildew caused by Erysiphe polygoni DC is one of the major constraints in the production of black gram, which lead to a potential decrease in yield (40-90%). In order to know the severity of black gram powdery mildew, the roving survey was carried out to know the severity of the disease in five districts of northern Karnataka viz., Belgaum, Dharwad, Gadag, Haveri and Uttara Kannada districts during Kharif and Rabi season of 2012-13. Maximum mean per cent disease severity (PDI) was observed in Belgaum district (68.72%) followed by Dharwad district (59.73%), Haveri district (52.10%) and Uttara Kannada district (44.59%). Whereas, minimum per cent disease severity (PDI) was noticed in Gadag district (20.23%).