Under the laboratory conditions, toxicological evaluation of two compounds, Radiant
SC 12% and Hexaflumuron (IGR) EC 10% against eggs of Pectinophora gossypiella
(Saund.) and biological effect of these compounds on larvae, pupae and adult emergence
resulted from treated eggs was also studied. The results revealed that LC50s were 3.15,
0.811and 0.522 ppm., when one, two and prehatching days old eggs, respectively were
treated with Radiant, while LC50s were 3.754, 2.863 and 2.004 ppm, respectively for
Hexaflumuron. The obtained results show a prolongation in larval and pupal developments
resulted from treated eggs by Radiant, estimated by 20.8, 18.5 and 8.2 days, respectively for
larvae and 8.9, 8.8 and 7.9 days for pupae. In case of Hexaflumuron, duration were 22.3, 20.6
and 20.4 days, respectively for larvae after egg treated and 10.8,10.0 and 11.3 days,
respectively for pupae. In contrast, in adult stage, the results indicated high reduction in total
eggs laid, percentage of hatchability and longevity.