INSECTICIDAL EFFECT OF THREE ESSENTIAL OILS AND BEAUVERICIN NANO GEL ON SITOPHILUS ORYZAE AND SITOPHILUS GRANARIUS (COLEOPTERA :CURCULIONIDAE)

Abstract

Sitophilus oryzae and Sitophilus granarius (Coleoptera :Curculionidae) harmful insects cause a damages to stored product seeds. These pests controlled by chemical materials which pollute the environments. Essential oils are a natural compound used as insecticide to a lot of pests. In our research we controlled these pests by essential oils, Cinnamomum zeylancium, Zingiber officinale, Cuminum cyminum and Beauvericin nano gel 2%. Results showed that, the LC50s of S. Oryzae were 38, 44, 151 and 18 ppm for Beauvericin nano gel 2% C. zeylancium, C. cyminum and Z. officinale, respectively. Also LC50s for S. granarius obtained by the corresponding treatments were, 41, 144, 11and 29ppm. The accumulative of S. oryzae significantly increased after 48 (H) by 2.8 fold after application of Cinnamomum zeylancium oil. When Zingiber officinale Oil applications the accumulative mortality increased by 3,3fold. The Beauvericin nano gel 2% showed that the accumulative increased by increasing the exposure time.Cinnamomum zeylancium showed a higher effect on the wheat weevil S. granarius, where the accumulative mortality recorded 91 after 48 (H). The lower accumulative mortality after Beauvericin nano gel 2%, recorded 38 after 48(H). The repellency test showed that, the highest repellant found among the Beauvericin nano gel 2% treatments. Data presented show that the persistence effectiveness of oil significantly decreased by increasing the storage time. The potential of the insecticidal oils was high after 45 days of storage, against S. oryzae and S. granarius. The potential of the insecticidal effect of oil recorded the lowest percentage at the end of storage after 100 days to both S. oryzae and S. granarius.