سميت تنفسي و دوركنندگي اسانس گياه درمنه كوهي

Fumigant toxicity and repellency of the essential oil of Artemisia aucheri on four species of stored pests

Fumigation toxicity and repellency of essential oil of Artemisia aucheri Boiss (Asteraceae) was investigated on four species of stored products pests including: Callosobruchus maculatus F.(Col.; Bruchidae), Tribolium ccastaneum Herbst (Col.; Tenebrionidae), Sitophilus oryzae L, Sitophilus granarius L. (Col.; Curculionidae) at 30 ± 2 °C, 60 ± 5 r. h. under dark condition. After 48 h. of fumigation, mortality of adult insects was found to increase as the essential oil concentration increased. At the highest concentration of essential oil (0.926 µl / cm) mortality was recorded 84.41, 85.41, 84.70 and 83.04 % for C. maculatus, T. castaneum, S. oryzaeand S. granarius, respectively. During 3, 6 and for 9 h. after fumigation adult insects of C. maculatus with 20.33, 35.70 and 47.96 % mortality were found more susceptible than other species. LC50 values of essential oil were found to be 0.1074, 0.1221, 0.1277 and 0.1389 pi l cm3 for C. maculatus, T. castaneum, S. oryzae and S. granarius, respectively. The essential oil significantly repelled insects and at 0.03 pi l cm3 caused 41.99, 51.45, 47.31 and 46.31% repellency for C. maculatus, T. castaneum, S. oryzae and S. granarius, respectively. Repellency of the essential oil for all tested species was found to increase as its concentration was increased.