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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 Type
Dr Grade
Email
زراق عيسى علي الفيفي
Al-Fifi, Z I.A
Researcher
Doctorate
zalfifi@kau.edu.sa
Files
File Name
Type
Description
31807.pdf
pdf
Abstract
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