DefinePK

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.