21 Kas 2024 Perşembe
Biological efficacy of Hyptis suaveolens (Lamiaceae) against antifeedant and repellency activity on Plutella xylostella (L.) (Lepidoptera: Plutellidae)
Abstract : Present paper highlights, the effects of Hyptis suaveolens (Vilaiti Tulsi) extracts on Plutella xylostella larvae have been assessed under laboratory conditions. The devastating insect, Plutella xylostella (Linnaeus), a devastating that attacks cruciferous vegetables (Cauliflower, Cabbage etc.), alone results in monetary losses of around US$4–5 billion worldwide. The result showed that the larval feeding was inversely related to concentration of aqueous, methanol and petroleum ether extract of Hyptes suaveolens. The repellent effect of different plant extracts of H. suaveolens on P. xylostella larvae was effective, however, the methanol extract (96%) of H. suaveolens was found more effective than petroleum ether (94%) or aqueous (88%) ether extract. The Antifeedant Index (AFI) for aqueous and methanol extract was found to be highly effective (R2= 0.99008 and R2= 0.72235). These results indicate that the methanol extract of Hyptis suaveolens could be used potentially for the management of diamond back moth (DBM), Plutella xylostella.