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Articles by A. Regupathy
Total Records ( 4 ) for A. Regupathy
  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%.
  D. Rajabaskar and A. Regupathy
  The bioefficacy of neem formulations, diafenthiuron and profenofos was tested individually and found effective against thrips Sciothrips cardamomi Ramk and shoot and capsule borer Conogethes punctiferalis Gunee in small cardamom. Based on the cost effectiveness, TNAU Neem oil 0.03 EC (1000 mL ha-1), diafenthiuron 50 WP (600 g ai ha-1) and profenofos 50 EC (500 mL ha-1) were used to develop different IPM modules. Eleven IPM modules were evaluated and found to the sequential application of Neem, Diafenthiuron, Diafenthiuron, Profenofos and Profenofos (NDDPP) at 21 days interval was the most effective against S. cardamomi and the sequential application of Neem, Profenofos, Diafenthiuron, Neem and Profenofos (NPDNP) was the most effective against shoot and capsule borer C. punctiferalis. These IPM modules were more cost effective compared to other modules.
  T. Ramasubramanian , K. Ramaraju and A. Regupathy
  Tetranychus urticae is known to have a high tendency to develop resistance to acaricides among the mite species. It has been heavily exposed to acaricides among the acari and had developed resistance to dicofol, amitraz, organotins, propargite, pyrethroids, fenbutatin oxide, hexythiazox, clofentezine, abamectin and METI (Mitochondrial Electron Transport Inhibitors) acaricides fenazaquin, fenpyroximate, pyridaben and tebufenpyrad around the globe. The compilation and subsequent comparison of resistance data reported for different strains world wide is a complicated task because of the difference in bioassay methodology adopted, variation in the susceptibility of reference strains used to calculate the resistance ratio and stage of the mite (adult female/larvae) assayed for by the toxicologists. The establishment of baseline LC50 to new acaricides before widespread use may allow better monitoring of changes in susceptibility over time and can provide opportunity to detect resistance before the occurrence of field failure. Discriminating concentrations need to be determined for quick and reliable monitoring of resistance in the future. Genetically established resistance mechanisms in spider mites were similar to those found in insects (reduced penetration, target site insensitivity and enhanced metabolism). An ARM (Acaricide Resistance Management) package for T. urticae need to be developed that may guide for the mitigation of resistance. The magnitude of resistance and the mechanisms responsible for the acaricide resistance in T. urticae around the globe have been reviewed.
  D. Rajabaskar and A. Regupathy
  The calling behavior and attractiveness of Conogethes punctiferalis to female crude extract and synthetic blend were investigated. The dose, age, sex of the C. punctiferalis, ratio of the compounds and airflow had significant influence over attraction of male shoot and capsule borer in cardamom. The calling of females started 03.45 h after start of scotophase and peak calling was observed 3 h prior to end of scotophase and attraction of male moths to synthetic blend (E-10-hexadecenal and Z-10-hexadecenal) was maximum at 90:10 and followed by 80:20 ratio.
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