Comparison of efficacy of Insecticides, Dichlorvos, Imidacloprid, Spinozad and Chlorantranilpyrrole on Bemisia tabaci in vitro

The cotton Whitefly is one of the most important pests in crops, greenhouses and ornamental plants. Due to the multiplicity of generations and the short time of one generation, this pest has the potential to be resistant to various insecticides. Over the years, control of cotton whitefly by common insecticides has not been effective. In this study, the susceptibility of adult whitefly to Dichlorvos, Imidacloprid, Spinozad and Chlorantranilpyrrol alone and pre-treated with PBO (Pyrphenyl butoxide), TPP (triniphenyl phosphate) and DEM (MEM) synergists was investigated. . Leaf dipping method was used for bioassay. The lowest level of LC50 on adults was related to the insecticide Chlorantranilpyrrole (1.25 mg a.i / L) and the highest level of LC50 was related to the Dichlorvos (269.59 mg (a.i / L)). The levels of LC50 Spinozad and Imidacloprid (mg a.i / L) were estimated to be 3.22, 87.61, respectively. The interaction of  Dichlorvos, Imidacloprid, Spinozad and Chlorantranilpyrrol with synergistic pre-treatments showed an  increase in efficacy of insecticieds so that with TPP The LC50was 2.35, 3.89, 2.36 and 1.68, respectively. The interaction between DEM and Imidacloprid, Spinozad and Chlorantranilpyrol increased mortality to 2.84, 4.79, 3.15 and 1.71mg ai.l. respectively. Resistance to Diclorus and Imidacloprid observed in this study is likely to be due to overuse of these pesticides. To prevent resistance, it is recommended to apply these pesticides inside the frame of pest manangment program