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Arylpyrrole acaro-insecticide chlorfenapyr-a tool for managing yellow thrips Scirtothrips dorsalis Hood) and broad mite (Polyphagotarsonemus latus Banks) of chilli

Arylpyrrole acaro-insecticide chlorfenapyr-a tool for managing yellow thrips Scirtothrips dorsalis Hood) and broad mite (Polyphagotarsonemus latus Banks) of chilli

P. K. SARKAR, G. P. TIMSINA, H.VANLALDIKIAND S. CHAKRABORTY Department of Agricultural Entomology Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741 252, Nadia, West Bengal

Journal Title:Journal of Crop and Weed
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 (8.75m 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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