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Journal of Biological Sciences

Year: 2005  |  Volume: 5  |  Issue: 6  |  Page No.: 681 - 686

Stimulo-deterrent Diversionary Strategy with Conjunctive Use of Trap Crops, Neem and Bacillus thuringiensis Berliner for the Management of Insecticide Resistant Helicoverpa armigera (Hubner) in Cotton

P. Duraimurugan and A. Regupathy

Abstract

Studies were carried out to assess the effects of stimulo-deterrent diversionary strategy with trap crops, neem and Bacillus thuringiensis Berliner in cotton for the management of insecticide resistant Helicoverpa armigera (Hubner) at Agricultural Research Station, Vaigaidam and Agricultural Research Station, Bhavanisagar, Tamil Nadu Agricultural University, Tamil Nadu during 2003-2004. Field experiments were conducted on cotton (MCU7) with trap crops (okra and pigeonpea) and neem was used to diversify the pests to trap crops where by the control of these pest was assessed with the application of Bt (Delfin®). The preference of H. armigera was towards okra and pigeonpea as a trap crop compared to cotton. Application of NSKE on cotton diversified the H. armigera towards untreated okra and pigeonpea. Stimulo-deterrent diversionary strategy with conjunctive use of trap crops (okra and pigeonpea), restricted application of NSKE on cotton leaving trap crops and restricted application of Bt on trap crops was highly effective in reducing the incidence of H. armigera and damage to fruiting bodies, boll, locule and inter locule basis over cotton sole crop (untreated check). The percent recovery of Bt infected larvae varied from 43.3-48.8, 40.0-48.3 and 32.7-38.6% on okra, pigeonpea and cotton, respectively. The synthetic pyrethroids resistance in field survived H. armigera at the end of the season was reduced from 88.0-92.7 to 81.1-89.7%.

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