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Five natural ethanolic plant extracts of Rhazya stricta, Caralluma tuberculata, Capparis spinosa, Marrubium vulgare and Argemone ochroleuca were tested in the laboratory for their insecticidal and repellent effectiveness against saw-toothed grain beetle, Oryzaephilus surinamensis (L.). Four concentrations of each plant extract, 200, 400,600 and 800 ppm were tested. Larvae and adult beetles were exposed to plant extracts for 6 days. Mortality percentage was recorded after 2, 4 and 6 days from exposure. The repellent action of the previous plant extracts was also, studied. All of these extract showed remarkable toxicities. Results showed that complete mortality of O. surinamensis was achieved by C. tuberculata and R. stricta at the concentration of 800ppm for both larvae and adult beetles. The rest of plant extracts increased mortality with increasing of concentrations. Of five plant extracts, the effect of C. tuberculata and R. stricta were relatively more pronounced with LC50 values of 203, 970 and 244, 245 ppm, respectively, two days from treatment. Corresponding LC50 values after six days exposure for larva, values were 114, 615 and 117, 775. As for adult, the LC50s values after 2 days were 210.062 and 238.563. After 6days, LC50s were 123.295 and 127.182 respectively. Moreover, R. stricta and C. tuberculata exhibited high repellency 100% and 90.08% at concentration of 800 ppm against O. surinamensis adults. The application of these extracts may be promising in protecting of stored date and grains against the attack of O. surinamensis specially extracts of C. tuberculata and R. stricta.

journal of plant protection and pathology /journal of plant protection and pathology

INSECTICIDAL AND REPELLENT EFFECT OF SOME INDIGENOUS PLANTextracts Against Saw-Toothed Grain Beetle, Oryzaephilus surinamensis (L.) (Coleoptera: Sivanidae)