Abstract

C Three types of solvents organic extracts, i.e. Ethyl alcohol, Ethyl acetate and n-Hexane of leaves and flowers of carnation (Dianthus caryophyllus L.) were tested under different concentrations to test the toxic effects on some biological aspects of the Khapra beetle (Trogoderma granarium), and the study of the repellency effect against the adult beetle. Results revealed that ethyl alcohol extracts of leaves and flowers caused a higher mortality rates on different life stages of insect (larvae – pupae - adults) it reached (%35.8) compared to the other extracts: Ethyl acetate and hexane where the percentage of mortality were( 27.7,31.8%) respectively, Extracts of flowers outpaced than the Extracts of leaves on effect of different stages of the insect, reaching rates of mortality (40.7,22.9%), respectively. The study showed an increased rates of destruction of various insect stages as the concentrations of the extracts were increased .It was found that the first instar larva was more susceptible than the mature instar larva. The study also showed that, hexane extract of flowers seems to be more effective on repellency than other extracts that used in the experiment as the percentage of expulsion (81,6%), followed by the effect of ethanol extract by the expulsion of (59,%) and by Ethyl acetate extract (54,8%).

The article was added to IASJ on 2012-05-21

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