Toxicity and behavioral effect of 3 β,24,25-trihydroxycycloartane and beddomei lactone on the rice leaffolder Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae)

• Published in: Ecotoxicology and environmental safety Vol. 72; no. 4; pp. 1156 - 1162
• Main Authors: Senthil-Nathan, Sengottayan, Choi, Man-Young, Seo, Hong-Yul, Paik, Chae-Hoon, Kalaivani, Kandaswamy
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.05.2009
• Subjects: Antifeedant; Biology; Deterrence; Dysoxylum; Leaffolder; Oviposition; Toxicity; Triterpenes; Weight; Triterpenes; Deterrence; Toxicity; BL; FDI; Biology; 3 β,24,25-THCL; RLF; Weight; Leaffolder; ODI; Dysoxylum; Antifeedant; Oviposition; EC
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2008.02.005

Treatment of Dysoxylum pure triterpenes 3 β,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 3 β,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.