EFFECT OF AN INSECT GROWTH INHIBITOR ON THE NEWLY HATCHED LARVAE OF PECTINOPHORA GOSSYPIELLA (SAUND.); CYANOX RESISTANT AND SUSCEPTIBLE STRAINS

Document Type : Original Article

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Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt

Abstract

Laboratory experiments were conducted using the growth inhibi­tor, CGA- 72662 against the newly hatched larvae of the pink bollworm Pectinophora gossypiella (Saund.) to evaluate its biological activity and latent effect on this pest. Data revealed that LC5o values were 176.2 and 1046.44 ppm for susceptible and cyanox resistant strains, respec­tively. Treating the newly hatched larvae of the two strains with LC25 concentrations of the compound (10.86 and 247.13 ppm)resulted in a significant reduction of the pupal weight, number of deposited eggs/ female and eggs hatchability. Reduction in pupal weight was more evi­dent in case of susceptible strain (32,51%) than the resistant one (7.8%). Compared to control , reduction in the mean number of deposit­ed eggs reached 54.9 and 43.95% for cyanox resistant and susceptible strains, respectively. However, reduction of egg hatchability was about 27% for the two strains. The compound could be fairly considered po­tent against the larvae of the pink bollworm.

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