Akademik Veri Yönetim Sistemi
Turkiye Entomoloji Dergisi, cilt.36, sa.3, ss.377-389, 2012 (SCI-Expanded)
Toxic and behavioral effects of Tanacetum abrotanifolium (L.) DRUCE (Asteraceae) stem and flower extracts were tested on Sitophilus granarius (L.) and S. oryzae (L.) (Col, Curculionidae) under laboratory conditions. The stem and flower extracts were obtained using three different solvents that were hexane, ethyl acetate and methanol. Both stem and flower extracts of T. abrotanifoliium produced very high level of contact toxicity to the granary weevil. The greatest contact toxicity to granary weevil was seen with the stem hexane extract which caused 64% mortality. Dose-response bioassay with granary weevil exhibited that stem extracts were more toxic than the flower extracts and LD50 values were 5.54, 4.81 and 5.01 μg/insect for stem hexane ,ethyl acetate and methanol extracts respectively. In the second series of experimets, deterrent and antifeedant effects of plant extracts were tested with choice and non-choice set up. All tested plant extracts caused reduction in feeding of both S. oryzae and S. granarius. T. abrotanifolium extracts showed high level of deterrent activity to both species and their activity increased as the incubation time was extended. In choice set up, the most pronounced antifeedant activity was seen with stem methanol extract (71%) for the granary weevil and with flower-hexane extract (69%) for the rice weevil. In non choice set up, flower-hexane and flower-ethyl acetate extracts yielded the highest antifeedant activity (47%) against S. granarius and flower-hexane extract (71%) was the most active extract for S. oryzae. The results indicate that T. abrotanifolium has a potential in control of S.granarius.