Effect of Some Plant Extracts on Mortality of Khapra beetle (Trogoderma granarium Everts) (Coleoptera: Dermestidae)

Abstract

The experiment of the present study were conducted under laboratory condition at college of agricultural study, Sudan University of Science and Technology to evaluate the effect of two plants extracts Damas Conocarpus lancifolius and Kaphor Eucalyptus against the third (3rd) instar of the larvae of khapra beetle Trogoderma granarium (Everts) in wheat seeds. Three formulations (powder, aqueous and ethanolic extracts) of leaves for each plant were used at three concentrations (10%, 20% and 30%) in this study. The results showed that all concentrations of all tested plants in various formulations gave significantly higher mortality percentage than control. The mortality were assessed after 24 hours and 48 hours of treatments for the test of ethanolic and aqueous extracts. However, for the test of powder extract,data for mortality were collected after one and two weeks of treatment. The experiments were conducted at three replications with Completely Randomized Design (CRD). The highest concentration (30%) of Kaphor leaves for ethanolic and aqueous extracts, after 48 hours of exposure, gave the higher mortality percentages (63%), (47%) respectively compared with the other treatments. Whereas, the concentration (30%) of Damas ethanolic and aqueous extracts after 48 hour of exposure gave mortality percentages of 47%, and 37% respectively. For the leaves powder test, the highest concentration (30%) of Kaphor after two weeks of exposure, revealed higher mortality (40 %) compared with, the percentage (33%) achieved by the same concentration of Damas powder extract for the same period of exposure.