Insecticidal activity of 2-tridecanone against the cowpea weevil Callosobruchus maculatus (Coleoptera: Bruchidae).
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.
Braga
Yussef F B
YF
Laboratório de Genética Molecular, Departamento de Biologia, Universidade Federal do Ceará, Fortaleza, CE, 60971-270, Brasil.
Grangeiro
Thalles B
TB
Freire
Eder A
EA
Lopes
Helano L
HL
Bezerra
José N S
JN
Andrade-Neto
Manoel
M
Lima
Mary Anne S
MA
D000818:Animals; D005260:Female; D007306:Insecticides / Q000008:administration & dosage* / Q000302:isolation & purification; D007659:Ketones / Q000008:administration & dosage* / Q000302:isolation & purification; D010058:Oviposition / Q000187:drug effects; D027805:Phaseolus / Q000469:parasitology*; D032103:Pilocarpus / Q000737:chemistry*; D048889:Weevils
D007306:Insecticides; D007659:Ketones; C009541:2-tridecanone