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Effects of Azadirachta excelsa on feeding behaviour, body weight and mortality of Crocidolomia binotalis Zeller (Lepidoptera: Pyralidae)

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We investigated the effects of methanolic extracts of Azadirachta excelsa wood (SWE) at concentrations of 5, 10 and 20 g l−1 against Crocidolomia binotalis. Second instars were fed a diet of cabbage leaves treated with SWE or were contacted topically with SWE. The results indicated that SWE produced significant (p < 0.05) antifeedant and contact toxicity effects. However, among the different treatments, a lesser effect on pupal weight was noted in the contact toxicity test. In most instances, untreated leaves were severely damaged, whereas leaves treated with SWE were not attacked or were only slightly damaged. Although both methods of SWE treatment caused a significantly high mortality rate, there was no difference in dose response in the range studied. Thus SWE at a concentration of 5 g l−1 was shown to be as active as that at 20 g l−1. The results indicate that SWE is a potent antifeedant and also has toxicity against C binotalis. Copyright © 2003 Society of Chemical Industry
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Keywords: Azadirachta excelsa; Crocidolomia binotalis; bioinsecticides; sentang

Document Type: Research Article

Affiliations: 1: Department of Food Science and Technology, Tajen Institute of Technology, Pingtung, Taiwan, ROC 2: Malaysian Agricultural Research and Development Institute, GPO Box 12301, 50774 Kuala Lumpur, Malaysia 3: CABI-SEARC, PO Box 210, 43409 UPM, Serdang, Selangor, Malaysia 4: Forest Research Institute Malaysia, Kepong, 52109 Kuala Lumpur, Malaysia

Publication date: October 1, 2003

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