Effects of azadirachtin on embryological development of the desert locust Schistocerca gregaria Forskal (Orthoptera: Acrididae)

摘要

Azadirachtin prolonged the incubation period and reduced hatchability of desert locust eggs. Many embryos suffered morphological deformation of the compound eyes and legs and incomplete development of abdominal segments. Histologically, the brain was poorly developed, this being reflected in the compound eyes, neurosecretory cells and entire ventral nerve cord. The embryonic cuticle was insufficiently deposited. The electrophoretic mobilities of the egg proteins after the addition of 200 ppm of azadirachtin were characterized by SDS-PAGE analysis and revealed the appearance of new protein bands and the disappearance of others. We conclude that after suitable field trials, the use of azadirachtin may be a viable alternative to chemical insecticides for control of grasshoppers in Egypt.