Synthetic insecticides have been the major control method of insect
pests since 1950s. The widespread and unwise use of insecticides
has resulted in the development of insect strains that are
resistant to insecticides. The level of insecticide resistance was
evaluated in two economically important stored grain pests,
Tribolium castaneum (Herbst) and Rhyzopertha dominica (Fabricius)
in the present study. Resistance level was checked against one
organophosphate and four pyrethroid insecticides by using filter
paper method and residual film method. Mortality was recorded after
48 hours of treatment. Resistant insects were identified on the
basis of their LC50 values. T. castaneum (H.) appeared to be more
resistant as compared to R. dominica (F.). Results indicated that
deltamethrin 2.5% SC was more toxic of all test insecticides while
DDVP 50% EC was least toxic.
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