Uji Aktivitas Insektisida Ekstrak Daun Serai Terhadap Ulat Daun Kubis (Plutella xylostella L.) di Laboratorium

Abstract

The study was conducted to evaluate effects of varied concentrations of methanol extract of lemon grass, Andropogon nardus L. (10.5%, 9.5%, 8.5%, 7,5%, 6.5%, and 0% as control) on mortality and feeding activity of the third-instars of P.xylostella larvae. It was used a randomized complete design with three replicates. The results showed that the leaf extract of Andropogon nardus at 8.5 % was the best treatment as it could caused high mortality of P. xylostella (66.67 %) and it was able to deter the feeding activity up to 82.66 %. The data suggested that extracts of Andropogon nardus contains toxic oil and feeding activity repellant.