Abstract
Insecticides with different mode of actions viz., spinosad, emamectin benzoate, thiodicarb, monocrotophos and fenvalerate were applied at LC50 and field recommended concentrations (FRC) to study the persistence of insecticides under elevated CO2 (550 ± 25 ppm) and temperatures (28, 29, 31, 33 and 35ºC). These insecticides often caused significantly higher mortalities at 28ºC than at 35ºC. The mean per cent corrected mortality, persistence in days and persistent toxicity values decreased for all insecticides with increase in temperatures at both levels of CO2 and corresponding temperatures. Among the five insecticides, emamectin benzoate (13 days) and spinosad (12 days) persisted for longer periods with highest mean per cent corrected mortality (58.1 and 56.3) with PT values of 749.5 and 675.0, respectively. The next in order were thiodicarb, monocrotophos and fenvalerate.
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