Abstract
Thearmy worm Spodoptera litura(fabricius) is one of the most damaging pests of ground nut and castor in India. Wedetermine the susceptibility of S. litura reared on a castor leaves, tothree insecticides (Temephos, Dichlorvos, and lambda-cyhalothrin) underlaboratory conditions, associated withthe enzyme activities of acetylcholinesterase (AChE), carboxylesterase (CarE),glutathione S-transferase (GST) and glutathione S- reductase (GSH) in thislarvae. Among treatments Dichlorvos showed high mortality then lambdacyhalothrin and Temephos in whole body of the insect. The AChE activities of Spodoptera litura treated with lambdacyhalothrin, Temephos at 10ppm were almost 1.5 fold high. The CarE activity at10ppm was almost 3 fold high. The GSH and GST activity were low then control(0.2 ± 0.4, 1.5 µM mg protein-1 min-1). The present studysuggests that esterase and acetylcholine esterase may play a role in detoxificationof synthetic pyrethroid and organophosphates in Spodoptera litura from South India.
Highlights
Spodoptera litura (Lepidoptera: Noctuidae) is a polyphagous insect pest (Holloway, 1989)
The present study suggests that esterase and acetylcholine esterase may play a role in detoxification of synthetic pyrethroid and organophosphates in Spodoptera litura from South India
Insecticide resistance in lepidopteran is a major concern throughout the world
Summary
Spodoptera litura (fabricius) (Lepidoptera: Noctuidae) is a polyphagous insect pest (Holloway, 1989) It is an indigenous pest of a variety of crops in South Asia and was found to cause more than 26-100% yield loss in groundnut (Dhir et al, 1992). It is variously known as Indian Leaf worm and tobacco cutworm (Rao et al, 1993). The control of this pest has depended on application of chemical insecticides; as a result which may develop resistance (Armes et al, 1997; Kranthi et al, 2002) and subsequent control failures. In many cases detoxification enhancement causes metabolic resistance and involves three major groups of enzymes like esterases, glutathione complex and cytochrome P450 (Hemingway, 2004)
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