Developmental and feeding alternations in Leptinotarsa decemlineata say. (Coleoptera : Chrysomelidae) caused by Salvia officinalis L. (Lamiaceae) essential oil

Abstract

Secondary plant metabolites can express the regulatory effects on development and survival of other plant species, microorganisms or animals. In this study, we investigated the toxic and antifeedant effect of ethanol solutions of derivatives obtained from sage (the essential oil, five fractions of the same oil F1 -F5, and the camphor) against the second instar larvae and adults of Colorado potato beetle (CPB). The bioassays were performed in laboratory conditions. Toxicity of tested solutions was negligible; with exception of S. officinalis essential oil which caused low mortality of insect (29.16% dead larvae and 20.83% dead adults, respectively). Alternations in development evaluated as number in both laid eggs and hatched larvae were insignificant. Antifeedant activity of tested solutions against the CPB larvae during the first 96h was significant; although their effectiveness decreased after 4 days, the LAM was still lesser in comparing with untreated control.