Insecticidal activity of 2-tridecanone against the cowpea weevil Callosobruchus maculatus (Coleoptera: Bruchidae)

• Published in: Anais da Academia Brasileira de Ciências Vol. 79; no. 1; pp. 35 - 39
• Main Authors: Braga, Yussef F B, Grangeiro, Thalles B, Freire, Eder A, Lopes, Helano L, Bezerra, José N S, Andrade-Neto, Manoel, Lima, Mary Anne S
• Format: Journal Article
• Language: English
• Published: Brazil Academia Brasileira de Ciências 01.03.2007
• Subjects: 2-tridecanona; 2-tridecanone; Animals; Bruchidae; Callosobruchus maculatus; Coleoptera; cowpea; feijão-de-corda; Female; Insecticides - administration & dosage; Insecticides - isolation & purification; Ketones - administration & dosage; Ketones - isolation & purification; MULTIDISCIPLINARY SCIENCES; Oviposition - drug effects; Phaseolus - parasitology; Pilocarpus; Pilocarpus - chemistry; Pilocarpus microphyllus; Weevils; cowpea; 2-tridecanone; Callosobruchus maculatus; Pilocarpus microphyllus; 2-tridecanona; feijão-de-corda
• ISSN: 0001-3765; 1678-2690; 0001-3765; 1678-2690
• DOI: 10.1590/S0001-37652007000100005

The effect of 2-tridecanone vapor on the cowpea weevil (Callosobruchus maculatus) development was determined. Seeds of cowpea were infested with adults and exposed to different doses of 2-tridecanone isolated from Pilocarpus microphyllus Stapf ex Holm, a plant species native from northeastern Brazil. The pure monoterpene was evaluated both undiluted as well as in the dilutions 1:10, 1:100 and 1:1,000 (v/v). The following parameters of the cowpea weevil life cycle were analyzed in response to decreasing doses of 2-tridecanone: number of eggs laid, percentage of egg hatching on seeds, percentage of adult emergence, adult weight at emergence, mean developmental time and number of adults emerged. Vapor of 2-tridecanone caused a significant (P < 0.05) reduction in the number of eggs laid, in the percentage of eggs hatched and in the number of emerged adults in infested seeds. The fumigant insecticidal effect of 2-tridecanone was mainly due to its ovicidal activity.