Insect pest and disease situation of cotton in Haryana

摘要

Cotton is one of the most important commercial fibre crops in India. Us average yield in India is 153 kg lint/ha, which is very low in comparison to world average of 411 kg. Among the various causes responsible for the low yield, the losses caused bythe insect-pests and disease are of prime importance (Agarwal and Katiyar, 1979). Among insect pests, jassids (Amrasca biguttula biguttula), pink boll worm (Pectinophora gossypiella) and spotted bollworm (Earias sp.) are of great economic importance. Recently, American bollworm, Heliothis armigera has also acquired pest status, as unprecedented attack of Heliothis (Av.4.5) larvae/plant) occured on colton during Sept.-Oct., 1990 Kharif season (Anonymous, 1991) with an average loss of 15-20 per cent. Keeping in view the huge losses caused by insect-pests, regular surveillance was conducted during kharif, 1991 in the major cotton growing areas of Haryana to know the latest pest position at farmer's field with the aim of issuing forewarning so that timelycontrol measures are initiated. Similar surveys were also conducted to assess the relative prevalence of different disease in Haryana (Chauhan and Yadav, 1990).