LATENT EFFECT OF IGRs ON EGG-MASSES OF SPODOPTERA LITTORALIS (BOISD.) TREATED WITH THREE IGRs IN EGYPT

Document Type : Original Article

Authors

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

2 Plant Protection Department, Faculty of Agriculture, Zagazig University, Egypt

Abstract

Three new insect growth regulators namely, Diafenthiuron. Bu-profezin, and Pyriproxyfen were evaluated against the egg stage of S.littoralis. Egg-masses were used to evaluate the ovicidal effect of IGRs and also to study the latent effect using dipping technique in 500 ppm solu‌tions. All the tested IGRs decreased hatchability. the most active com‌pound as ovicide was Buprofezin which recorded 27.3% reduction of hatchability and 30.5 mortality in hatched larvae. Also, the highest re‌duction in percentage of pupation were recorded in eggs treated with Buprofezin as compared with the untreated eggs.