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Azadirachtin induced changes in development, food utilization and haemolymph constituents of Schistocerca gregaria Forskal



Azadirachtin induced changes in development, food utilization and haemolymph constituents of Schistocerca gregaria Forskal



Journal of Applied Entomology, 1023: 217-224



Azadirachtin, a compound from seed kernels of the neem tree, Azadirachta indica A. Juss was tested at 2 .mu.g/g for its effect on development, food consumption and utilization and hemolymph constituents of final instar Schistocerca gregaria. The effective dose in causing 50% moult inhibition (ED50) was 1.66 .mu.g/g. In the range of 1-8 .mu.g/g azadirachtin caused reduction in body weight which was, in general, dose dependent. Even the highest dose failed to induce absolute feeding inhibition. Some of the azadirachtin treated nymphs survived beyond 40 days without moult and those attempted to moult after the normal moulting period (16-18 days) generally died during ecdysis. It significantly reduced the rate of feeding, growth and utilization of food to body matter in both sexes. Its effect on females was more drastic as they showed negative growth rate revealing the catabolic state. Maximum changes in hemolymph protein and amino acid levels were observed particularly in females between 5th and 8th day after treatment.

Accession: 001534339

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DOI: 10.1111/j.1439-0418.1986.tb00914.x

Download PDF Full Text: Azadirachtin induced changes in development, food utilization and haemolymph constituents of Schistocerca gregaria Forskal



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