Author(s): P. K. SARKAR, G. P. TIMSINA, H.VANLALDIKIAND S. CHAKRABORTY

Abstract: Two most obnoxious invisible enemies of chilli include yellow mite or broad mite (Polyphagotarsonemus latus) and thrips (Scirtothrips dorsalis) in Indian sub-continent. Dry weather during crop growth period increases the intensity of infestation of thrips vis-a-vis global warming from January last fortnight onwards, favours the attack of yellow mite. These two types of agro-climatic parameters prevail during pre-monsoon months in eastern part of Indian sub-continent. Hence, both the species appear simultaneously in chilli. Damage intensity due to their attack may reach to the tune of 25-100%. Under this context selectivity of chlorfenapyr 10SC, was evaluated for two consecutive years i.e. 2009-2010 and 2010-2011 in a farmer\'s field (8.75 m above msl) at Gangetic Alluvial plains of West Bengal@ 50, 75, 100 and 125 g a.i. ha-1 along with recommended check fenazaquin 10 EC (@ 100 g a.i. ha-1) and imidacloprid 17.8 SL (@ 20 g a.i). On the basis of post treatment on mite and thrips population, chlorfenapyr @ 100 and 125 g a.i. ha-1 were found to be most effective against the pests. There was significantly less infestation at both the stated concentration (100 and 125 g a.i. ha-1) up to 15 days after treatment. It was also found to be \"moderately toxic\" to beneficials in chilli including different coleopteran beetles. The molecule did not produce any phytotoxic symptom in chilli.

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