title: Bruchid (Coleoptera: Bruchidae) ovicidal phenylbutanoid from Zingiber purpureum.
abstract: The larvicidal activity of the dichloromethane extract of Zingiber purpureum Roscoe (Zingiberaceae) rhizome against the second instar of Aedes aegypti (L.) (Diptera: Culicidae) is shown to be due to 4-(3',4'-dimethoxyphenyl)buta-1,3-diene. The diene also showed ovicidal activity against the bruchid Callosobruchus maculatus (F.) (Coleoptera: Bruchidae). Most of the eggs laid by bruchids on treated cowpea seeds were transparent, and very few of them contained developing embryos. The few larvae produced from these embryos were unable to penetrate the seed coat and enter the seed. Similar effects were seen when adults were exposed to the compound and then placed on untreated cowpea seeds, suggesting that a new type of maternally mediated ovicidal effect was involved. Coated and impregnated granular formulations of the extract were evaluated for use in the control of bruchid infestation of stored cowpea seeds. Coated granules showed activity similar to that of the crude extract but were found to lose activity rapidly. Impregnated granules were found to be less active than the crude extract.
authors.affiliation: Department of Chemistry, University of Peradeniya, Peradeniya 20400, Sri Lanka.
authors.forename: K A Nimal P
authors.initials: KA
authors.lastname: Bandara
authors.forename: Vijaya
authors.initials: V
authors.lastname: Kumar
authors.forename: Ramesh C
authors.initials: RC
authors.lastname: Saxena
authors.forename: Puthenveetil K
authors.initials: PK
authors.lastname: Ramdas
mesh_terms: D000818:Animals; D002070:Butadienes / Q000737:chemistry / Q000494:pharmacology; D005260:Female; D007306:Insecticides / Q000737:chemistry / Q000494:pharmacology; D015394:Molecular Structure; D010058:Oviposition / Q000187:drug effects; D010063:Ovum / Q000187:drug effects; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D048889:Weevils; D030521:Zingiberaceae / Q000737:chemistry*
chemical_list: C479884:(E)-1-(3,4-dimethoxyphenyl) butadiene; D002070:Butadienes; D007306:Insecticides; D010936:Plant Extracts