title: Toxicity and behavioral effect of 3beta,24,25-trihydroxycycloartane and beddomei lactone on the rice leaffolder Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae).
abstract: Treatment of Dysoxylum pure triterpenes 3beta,24,25-trihydroxycycloartane and beddomei lactone to the rice leaffolder (RLF), Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae), resulted in prolonged larval duration and reduced larval weight. In leaf cut choice assay and topical application experiments, beddomei lactone and 3beta,24,25-trihydroxycycloartaneto showed strong antifeedant and growth inhibitor activity against fourth instar larvae of C. medinalis. Also average leaf consumption was decreased (89%) by the treatment of the two terpinoids when compared with controls. Number of eggs laid by the female (fecundity) was decreased and oviposition deterrence index was increased due to the treatment. This result further shows that the pure triterpenes of Dysoxylum act as both an antifeedant and chronic toxin to the rice leaffolder larvae.
authors.affiliation: Plant Environment Division, Honam Agricultural Research Institute (HARI), National Institute of Crop Science (NICS), Rural Development Administration (RDA), #381 Songhak-dong, Iksan, Chonbuk 570-080, Republic of Korea. senthilkalaidr@hotmail.com
authors.forename: Sengottayan
authors.initials: S
authors.lastname: Senthil-Nathan
authors.forename: Man-Young
authors.initials: MY
authors.lastname: Choi
authors.forename: Hong-Yul
authors.initials: HY
authors.lastname: Seo
authors.forename: Chae-Hoon
authors.initials: CH
authors.lastname: Paik
authors.forename: Kandaswamy
authors.initials: K
authors.lastname: Kalaivani
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D001835:Body Weight / Q000187:drug effects; D005247:Feeding Behavior / Q000187:drug effects; D005298:Fertility / Q000187:drug effects; D007814:Larva / Q000187:drug effects / Q000254:growth & development; D007915:Lepidoptera / Q000502:physiology*; D029582:Meliaceae / Q000737:chemistry*; D013729:Terpenes / Q000633:toxicity; D014315:Triterpenes / Q000633:toxicity*
chemical_list: C529712:3beta,24,25-trihydroxycycloartane; D013729:Terpenes; D014315:Triterpenes; C489878:beddomeilactone