Survey and surveillance for the incidence of powdery mildew of chilli in Northern Karnataka.

摘要

A survey was conducted for the incidence of powdery mildew (caused by Leveillula taurica) of chilli (Capsicum annuum) in different districts (Haveri, Dharwad, Gadag, Belgaum, Bellary, Raichur, Gulbarga and Koppal) of northern Karnataka, India, during kharif 2004 and 2005. The maximum disease severity of powdery mildew was recorded in Bellary and Gulbarga districts, where chilli crop was grown under irrigated condition. Less disease severity depended on factors such as location, cultural practices, followed by susceptibility of the cultivars grown, microclimate congenial for disease progress, and meteorological factors such as temperature, relative humidity and rain. The higher incidence of powdery mildew during kharif 2005 may be attributed to the temperature and relative humidity prevailing during the crop period, which were favourable for the disease development and spread.