author(s)
Emami Keykhosro, Valizadegan Oruj, Aramideh Shahram

abstract
In this research, three herbal insecticides namely Sirinol, Palizin and Tondexir were evaluated for their efficacy in the control of Tribolium castaneum (Herbst), under laboratory conditions. The LC25 and LC50 values of Sirinol, Palizin and Tondexir were estimated on adult insect. Furthermore, LC25 and LC50 values for Sirinol, Palizin and Tondexir treatments on adult insect were 451, 262 and 452 ppm and 1025, 362, and 744 ppm, respectively. After determining the LC50 and LC25 values of three agents, to evaluate the combined effects of Sirinol, Palizin and Tondexir an experiment was conducted in the form of completely randomized design with eight treatments including LC50 (Pal), LC50 (Sir), LC50 (Ton), LC25 (Pal) plus LC25 (Sir), LC25 (Pal) plus LC25 (Ton), LC25 (Sir) plus LC25 (Ton) and control. Our results demonstrated that Palizin was more effective. The results showed that percentage mortality combination three herbal agents treatments on adult insect compared with Sirinol, Palizin and Tondexir alone and control have significant differences (P<0.001).The results showed that the combination of Sirinol, Palizin and Tondexir have good additive effect when compared with applied individually treatments.