Impact of chromenes compounds on some biological aspects of the three cotton bollworm species under constant temperature

الملخص EN

The experiments were conducted in Plant Protection Research Institute, Sharkia branch, Agriculture Research Center to study the toxic and biological effects of chromens compounds against the pink bollworm (PBW), Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae) the spiny bollworm (SBW) , Earias insulana (Boisd.) and the American bollworm (ABW) , Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae).

Data revealed that chromens compounds had highest toxic effect against newlyA hatched larvae attained of American followed by spiny and pink bollworms larvae.

On the other hand, the latent effects of the chromens compounds on the three insect species were presented in increasing the accumulated of larval and pupal mortality percentages, non-significant increasing on larval duration of the three cotton bollworms insects, and significantly decreased in larval and pupal weight, increasing pre and post-oviposition periods, decreasing oviposition periods, male and female longevities and also reduced fecundity, while the highest reduction in laid eggs recorded on spiny followed by pink and American bollworms compared with untreated control, while the hatchability percentages decreased significantly with pink bollworm and highly significant with spiny and American bollworms compared with untreated control.