The effect of the essential oils extracted from Artemisia dracunculus L. and Eucalyptus camaldulensis Dehnh. on adults of Callosobruchus maculatus F. in different temperatures and humidities

The cowpea weevil, Callosobruchus maculatus F. (Col.; Bruchidae) is one of the most important stored product of the pests that damages the seeds. In order to find biorational insecticides, fumigant effects of the essential oil of two plant, Artemisia dracunculus L. and Eucalyptus camaldulensis Dehnh. were assessed on adults of C. maculatus. Acute toxicity bioassay was carried out for calculating LC50. The LC50 value was compared in 3 different temperatures and relative humidities and finally the LT50 was tested. The LC50 values were 26 and 24.5 μl/lit air in 24 h for E. camaldulensis and A. dracunculus, respectively. The temperatures (20, 26, 32 ) affected the toxicity of the essential oils significantly but humidity did not. LT50 values for E. camaldulensis and A. dracunculus were 6.3 and 8.9 hours, respectively. The results showed that the effects of the essential oils were increased by increasing temperature. Our results showed that the applied essential oils were effective against the pest and could be used in IPM programs.