| Sex ratio and female sexual status of the coconut pest, Oryctes monoceros (Coleoptera: Dynastidae), differ in feeding galleries and pheromone-baited traps. | |
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MedLine Citation:
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PMID: 18662429 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oryctes monoceros is a serious coconut pest, causing up to 40% damage in tropical Africa. Synthetic aggregation pheromone, ethyl 4-methyloctanoate, has been used to lure adults to traps. Traps with pheromone plus decaying palm material captured a high proportion of males. This raises the question whether individuals, which damage palms are receptive to the pheromone. We studied the sex ratio of the insects feeding on coconuts and those attracted to pheromone traps. Sixty two percent of adults from feeding galleries on living coconut palms were females. Pheromone with rotting palm material lured 43% females. To investigate the reasons for this difference, we compared the reproductive system of females lured to the odour traps or feeding in coconut galleries, or present in old rotting stems. Ninety six percent of the females trapped by pheromone had mated, and were sexually mature. In the galleries on living palms, 46% of females were immature, and 24% had not mated. In old rotting stems where eggs are laid and larvae develop, a mixture of 52% mated and 48% virgin females was found. Therefore, the pheromone together with the odour of rotting coconut stems signals a reproduction site to beetles, particularly mature females. In practice, the pheromone-baited traps will help in reducing the dissemination of gravid females, but will not affect directly the numbers of immature ones attacking palms. Our results show that when using pheromones for monitoring or controlling insects, the physiological status of the insects may have unexpected effects on the outcome. |
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Authors:
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K Allou; J-P Morin; P Kouassi; F Hala N'klo; D Rochat |
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Publication Detail:
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Type: Journal Article Date: 2008-07-29 |
Journal Detail:
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Title: Bulletin of entomological research Volume: 98 ISSN: 1475-2670 ISO Abbreviation: Bull. Entomol. Res. Publication Date: 2008 Dec |
Date Detail:
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Created Date: 2008-11-17 Completed Date: 2009-02-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2984715R Medline TA: Bull Entomol Res Country: England |
Other Details:
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Languages: eng Pagination: 581-6 Citation Subset: IM |
Affiliation:
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CNRA, Station Cocotier Marc Delorme, Laboratoire de Défense des cultures, 07 BP 13 Abidjan 07, Ivory Coast. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Beetles / drug effects, growth & development, physiology* Behavior, Animal / drug effects* Cocos / chemistry Feeding Behavior Female Insect Control / methods Male Ovary / anatomy & histology Reproduction Sex Attractants / pharmacology* Sex Ratio Sexual Behavior, Animal Spermatogonia |
| Chemical | |
Reg. No./Substance:
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0/Sex Attractants |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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