Research Article Risk Assessment of Trichogramma chilonis (Fab.) to New Molecules Evaluated against Spotted Bollworm, Earias vittella Ishii in Cotton


  • Tamil Nadu Agricultural University, Department of Sericulture, Coimbatore, Tamil Nadu, 641 003, India
  • Directorate of Rice Research, Hyderabad, Andhra Pradesh, 500 030, India


Studies were carried out in the laboratory to assess the acute toxicity of new molecules viz., abamectin, emamectin benzoate, indoxacarb and spinosad to target pest, Earias vittella (Fab.) and selective toxicity to non-target insect, Trichogramma chilonis (Ishii) in terms of LD50/LC50 and LD95/LC95 and assessing risk hazards associated with the use of new molecules for integration in IPM. Acute toxicity of the four test molecules was found to be 0.00264, 0.00266, 0.09270 and 0.00188 μg larva-1 and were less toxic to T. chilonis than the target pest when analyzed through various risk assessment methods and can be recommended for IPM. Among the four methods evaluated, hazard ratio is the best as it accounted for the field dose as criteria for determining the toxicity of the insecticides tested.


Abamectin, Emamectin Benzoate, Indoxacarb, Spinosad, Trichogramma chilonis, Earias Vittella.

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