Pesticidal effect of leaf, root and bark extracts of multipurpose trees and cashew nut shell liquid on coconut root grub (Leucopholis coneophora Bur.).

摘要

Leaf, root and bark extracts of fully grown mature trees of Artocarpus heterophyllus, Mangifera indica, Ailanthus triphysa, Anacardium occidentale, Tamarindus indica, Tectona grandis, Thespesia populnea, Casuarina equisetifolia, Gliricidia sepium and Strychnos nux-vomica and cashew nut shell liquid (CNSL) were evaluated for their insecticidal activity against coconut root grub (Leucopholis coneophora). Application of the extracts at 10% concentration gave mortality values on par with the control. However, application of the extracts at 20% concentration generally resulted in significant larval mortality. CNSL also showed potential in controlling the root grub. Phenols and tannins were identified in the extracts; these compounds are believed to be responsible for the insecticidal property of the trees.