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Abstract
The objective of the present study is to ascertain the effect of certain
insecticides on some physiological responses of the cotton leafwrom
They comprise consumption, utilization of food and growth of larvae
survived after treatment, as well as delayed effect of these insecticidal
treatments on some biological aspects. We used three insecticides
namely, (CU) profenofos (O.P.), (OR) alanycarb ro.c.) and (M:
lufenuron (benzoyl urea) (IGR). The treatment was done with constam
LC25 of each, to 4th instar larvae to (lab), (cu-t) and (k-f) strains. The
results infer to the conclusion that the following factors may affect the
physiological responses of the cotton leafworm: the toxicity of applied
insecticides, the order of succession of insecticides, the degree ol
susceptibility or tolerance of larvae tested, age of instar larvae testec
and recent molts of instars larvae or its approach of maturity.