Document Details

Document Type : Article In Journal 
Document Title :
Molting inhibitory and lethal effects of azadirachtin on the desert locust, Schistocerca gregaria (Forskål)
Molting inhibitory and lethal effects of azadirachtin on the desert locust, Schistocerca gregaria (Forskål)
 
Subject : Biological 
Document Language : English 
Abstract : Dose-response studies of azadirachtin, dissolved in 90% aqueous ethanol and injected into freshly molted crowded fifth (last) instar nymphs of Schistocerca gregaria revealed three kinds of responses: (I) Delay of the next molt and death in the delayed molt, or after apolysis, without being able to escape from the old exuviae; (II) Production of over-aged nymphs surviving up to 83 days without molt or apolysis; (III) Death within 20 days after treatment, without molt, presumably due to a direct toxic effect of the azadirachtin. Solvent injected controls molted to adults within 8-10 days. With increasing doses, response I decreased and response III increased. A dose of 30.4 μg g -1 (μg azadirachtin per g fresh weight) resulted in response III in all nymphs. A dose of 15.2 μg g-1 induced the highest proportion of over-aged nymphs, but even with this dose only 13.1% over-aged nymphs were obtained. With doses lower or higher than 15.2 μg g-1, the proportion of over-aged nymphs was even lower. Over- aged male nymphs exhibited sexual behavior, courting and mounting over-aged female nymphs and adult females, without being able to copulate. 
ISSN : 1812-5689 
Journal Name : Journal of Entomology 
Volume : 3 
Issue Number : 4 
Publishing Year : 1427 AH
2006 AD 
Article Type : Article 
Added Date : Tuesday, December 27, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
زراق عيسى علي الفيفيAl-Fifi, Z I.AResearcherDoctoratezalfifi@kau.edu.sa

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