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Red Cotton Bug, Dysdercus koenigii (Fabr.) (Hemiptera:Pyrrhocoridae), commonly called cotton stainer, is a damaging pest of cotton and other economical crops in Asia. Nymphs as well as adult of this pest suck the sap from the green bolls and leaves of cotton causing shedding of young bolls, rotting of green bolls, stained cotton fibers and loss of seed viability. The present study evaluates the toxic and growth regulatory effects of a pyrethroid, beta-cyfluthrin against D. koenigii. The newly emerged fifth instars nymphs were exposed to beta-cyfluthrin at concentration ranging from 0.00008% to 0.00128%. A volume of 1μL of beta-cyfluthrin was topically applied on the dorsal anterior thoracic region of nymphs (in 3 replicates, each replicate containing batch of 25 insects) and were observed for mortality after 24 hr. The nymphs were further reared till adults to observe delayed toxicity effects and developmental abnormalities, if any. The result revealed significant lethal effects of beta-cyfluthrin on D. koenigii nymphs with LD50 and LD70 values as 0.00051% and 0.00076%, respectively. A positive correlation was observed between percent nymphal mortality of D. koenigii and the dose of insecticide. The survived nymphal instars developed several development malformations; partial moulting, shrunk abdomen, abnormal adults with deformed wing, adultoids and adults with attached exuviae. Further studies are being conducted to assess the development of beta-cyfluthrin resistance in D. koenigii and strategies to counter resistance. These results can provide an important base for developing effective and desired strategies to control and monitor insecticides resistance in D. koenigii.

Assessment of Toxicity and Growth Regulatory Effects of Beta-Cyfluthrin Against Red Cotton Bug, Dysdercus koenigii (Fabr.) (Hemiptera: Pyrrhocoridae): An Emerging Cotton Pest