INSECT REGULATORY EFFECT OF MARGOSAN A NATURAL AZADIRACHTIN - CONTAINING PREPARATION ON THE DESERT LOCUST, SCHISTOCERCA GREGARIA (FORSK.) ( ORTHOPT., ACRIDIDAE )

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt

Abstract

The morphogenetic and metabolic effects of neem kernel extract, azadirachtin of the neem tree Azadirachta indica were investigated as in­dicators for its insect regulatory action in Schistocerca gregatia. Three doses of Azadirachtin (10,20 and 40 pg/nymph) were injected into one day old 4th instar nymphs. The injected doses had resulted In prolonga­tion in the duration of the last instars and a positive correlation between failure in ecdysis to 51h instar and adult stage. These morphogenetic fea­tures induced by azadirachtin in 4th and 5111 instar nymphs were consid­ered as Juvenilizing effect of this compound . The same doses were injected into one and 5 day-old 51h instar nymphs to disclose the metabolic effects of azadirachtin on their haemo­lymph main metabolites . This had resulted in high level of proteins and carbohydrates and low levels of lipids and cholesterol this reflecting the juvenilizing action of azadirachtin in S.gregaria . It was concluded that azadirachtin plays the same insect regula­tory role of Juvenile hormone in delaying or prohibiting metamorphosis, increasing levels of proteins and carbohydrates and suppressing lipids and cholesterol in gregarious nymphs of S.gregaria.

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