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Articles by P. Duraimurugan
Total Records ( 6 ) for P. Duraimurugan
  P. Duraimurugan and A. Regupathy
  Insecticide resistance in Helicoverpa armigera (Hubner) is a major threat to cotton production in India. The virus infection was found to increase the susceptibility of H. armigera to the insecticides. But, use of Nuclear Polyhedrosis Virus (NPV) on larger scale and on cotton due to leaf alkalinity possess certain practical problems. Hence, studies were carried out to assess the effects of push-pull strategy with trap crops, neem and NPV in cotton for the management of insecticide resistant H. armigera. Field experiments were conducted on cotton (MCU5) 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 NPV. 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. Push-pull strategy with conjunctive use of trap crops, restricted application of NSKE on cotton leaving trap crops and restricted application of NPV 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 NPV infected larvae varied from 37.5-47.5, 32.8-39.2 and 14.2-20.2% on okra, pigeonpea and cotton respectively. The synthetic pyrethroids resistance in field survived H. armigera at the end of the season was reduced from 87.5-93.1% to 76.4-84.3%.
  P. Duraimurugan and A. Regupathy
  Resistance to synthetic pyrethroids was diagnosed in the field population of American bollworm, Helicoverpa armigera (Hubner) from Coimbatore, Tamil Nadu, South India during 2003-2004 cropping seasons. A Discriminating Dose (DD) bioassay technique was used to monitor fortnightly changes in resistance at Coimbatore where number of crops served as host plants for this pest. The resistance level of various synthetic pyrethroids to DDs varied from 80.0 to 96.4%. The extent of resistance in terms of percent survival was 88.1-96.4, 87.2-94.3, 87.0-94.0, 84.3-94.2 and 80.0-91.8% for cypermethrin, fenvalerate, deltamethrin, lambda-cyhalothrin and beta-cyfluthrin, respectively.
  P. Duraimurugan and A. Regupathy
  In the present study, the talc-based formulation of Pseudomonas fluorescens strain (Pf1) was tested against H. armigera in cotton, okra and pigeonpea. The susceptibility of H. armigera fed on P. fluorescens treated and untreated plants was bioassayed against cypermethrin on cotton bolls, okra fruits and pigeonpea pods. The susceptibility of third instar larvae of H. armigera to cypermethrin, fed on P. fluorescens treated plants did not differ significantly with the untreated plants. However, there was variation in the protein banding pattern among the P. fluorescens treated and untreated plants with or without infestation of H. armigera. Protein bands of molecular weight 83 and 40 kDa in cotton, 130 and 52 kDa in okra were observed in the Pseudomonas treated plants with infestation of H. armigera.
  P. Duraimurugan and A. Regupathy
  Push-pull strategy with conjunctive use of trap crops, neem and Trichogramma chilonis Ishii was evaluated against cotton bollworm, Helicoverpa armigera (Hubner) under field conditions. Neem seed kernel extract (NSKE) was applied on cotton crop leaving trap crops (okra and pigeonpea) commencing from 46 DAS at weekly interval to increase the pushing of H. armigera away from cotton. Application of NSKE on cotton improved the oviposition preference ratio from 1:1.35 and 1:1.40 to 1:3.02 and 1:2.43 on cotton:okra and cotton:pigeonpea, respectively. Egg parasitoid, T. chilonis cards were tagged after each application of NSKE on the trap crops. The percent parasitism of eggs of H. armigera on cotton sole crop system ranged from 14.8 to 16.4% and that on trap crops was 10.4 to 12.0 and 14.5 to 15.5% on okra and pigeonpea respectively. Cotton (treated with NSKE) + Trap crops (Trichogramma released) system recorded the lowest mean egg, larval population and fruiting bodies, boll and locule damage. The synthetic pyrethroids resistance in field survived H. armigera at the end of the season was reduced from 85.3-94.0 to 84.8 -92.1%.
  P. Duraimurugan and A. Regupathy
  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%.
  M. Djanaguiraman , M. Pandiyan , P. Duraimurugan , J. Annie Sheeba , D. Durga Devi and U. Bangarusamy
  A pot culture experiment was conducted in tomato and cotton to evaluate the compatibility of Atonik with insecticide and fungicide. Atonik was sprayed at four different concentrations (0.1, 0.2, 0.4 and 0.8%) along with monocrotophos (2 ml L-1) or Atonik 0.4% and monocrotophos (2 ml L-1) alone and at three different concentrations (0.1, 0.25 and 0.5%) along with Confidor (0.2 ml L-1) or Atonik 0.25% and Confidor (0.2 ml L-1) alone to assess the bioefficacy on 25 and 45 DAS, in tomato and cotton, respectively. To assess the compatibility with fungicide the above mentioned Atonik concentration with fytolon and carbendazim in tomato and cotton, respectively was tested. The results revealed that Atonik is compatible with tested pesticides. The insecticidal property of monocrotophos or confidor or fungicidal property of carbendazim or fytolon was not altered along with growth promoting activity of Atonik. The plants sprayed with Atonik or in combination with pesticides showed zero grades of phytotoxic symptoms.
 
 
 
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