Efficacy of extracts of some Egyptian plants against economically important stored grain pest Sitophilus oryzae L.

Abstract

Stored grain IPM involves replacing some or all insecticide application with insect control practices such as sanitation, aeration and the use of natural resources as alternatives to pesticides. The aim was to study the efficacy of Egyptian wild plants namely, Gerba (Farsetia aegyptia), Egyptian mint (Mentha pulegium) and Halama, (Moltkiopsis ciliate) against Rice weevil Sitophilus oryzae L, for their insecticidal properties. Based on the solvents polarity separating funnel was used to fractionate the ethanolic extracts of each plant material (petroleum ether (fraction I), chloroform (fraction II), ethyl acetate (fraction III) and n-butanol (fraction IV)). The positive response of targeted insect toward treatments was indicating insecticidal and repellency properties. The results data revealed that high percent mortality of 52.0% was found in the fraction III (ethyl acetate) obtained from M. ciliate crude extract on D6 of treatment ime. And the maximum number of repelled alive insects was recorded in the extract fraction III (chloroform) of M. pulegium with percent repellency 30.0% on D2 and increased to 42.0% on D4. From the results; its highly recommend the tested plants to be used as efficient safe alternative source for rice weevil control.