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Articles by T. Ramasubramanian
Total Records ( 3 ) for T. Ramasubramanian
  T. Ramasubramanian and A. Regupathy
  Survey on insecticide resistance monitoring for a period of one year indicated that the Helicoverpa armigera population of Tamil Nadu developed very high level of resistance to synthetic pyrethroids, medium level of resistance to chlorpyrifos and quinalphos, low level of resistance to endosulfan, thiodicarb and profenofos and cent per cent susceptibility to the new chemistry spinosad. Synergistic studies with piperonyl butoxide, pungam oil and profenofos clearly indicated that the common MFO mechanism was responsible for the high level resistance observed to synthetic pyrethroids.
  T. Ramasubramanian and A. Regupathy
  The bouquet bioassay experiments under laboratory condition revealed that the corrected percentage mortality of Helicoverpa armigera was 76.9-80.0% at recommended dose of spinosad. Good biological efficacy of this new molecule was also reflected in the suppression of larval population and reduction of damage to bolls, squares, locules and kapas in the field.
  T. Ramasubramanian and A. Regupathy
  In Helicoverpa armigera, withdrawal of selection pressure for fourteen consecutive generations resulted in 2.58 and 3.01 fold increase in the susceptibility to lambdacyhalothrin and betacyfluthrin, respectively. Similarly, continuous selection enhanced the resistance level to the extent of 6.77 and 7.14 fold to the respective pyrethroids. Populations selected for resistance to lambdacyhalothrin and betacyfluthrin showed positive cross resistance to all other pyrethroids tested and no cross resistance to endosulfan. The increased level of mixed function oxidases with advancement of generation favoured the positive cross resistance among the pyrethroids.
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