Contact toxicity of methanol extract of Eucalyptus globulus (Labill.) (Myrtaceae) against adults of the surface grasshopper, Chrotogonus trachypterus Blanchard (Orth.: Pyrgomorphidae)
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
Surface Grasshopper, Chrotogonus trachypterus Blanchard (Orthoptera: Pyrgomorphidae) is a polyphagous and the most important pest of field crops, vegetables etc. and caused considerable damage especially during seedling stages in semi-arid areas like Sistan (Iran, Sistan and Baluchistan, Zabol) region every year. We conducted this study in order to evaluate the contact toxicity of methanolic extract from leaves of Eucalyptus globulus (Myrtaceae) againt C. trachypterus in a completely randomized designs and factorial experiment with three replications using topical application under laboratory conditions. Adult’s mortality was counted 24 h after exposure. The results showed significant contact toxicity (at doses between 4.125 and 33 mg/mL) and at the highest concentration, the mortality of E. globulus was 86.6%. LC50 values of methanol extract, calculated through Probit analysis was 78.12 mg/ mL (P<0.05) after 24h of exposure of adults. Based on our results, we can conclude that leaves extracts of E. globulus, have potential for use in the integrated management of Ch. trachypterus in field. Due to the adaptation and abundance of eucalyptus trees in different parts of Iran, including Sistan-Baluchistan province, eucalyptus leaves extracts, could be used as a new alternative to chemical insecticides for control of Ch. trachypterus especially in combination with other tactics in an IPM program in field crops.
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