Optimization of the application of Fenphyroximite, Propargitis and Fenazaquin against twospotted spider mite

Cowpea is widely cultivated worldwide and used as an important food source. Tartanychus urticae, Koch is one of the Cowpea is widely cultivated worldwide and used as an important food source. Tartanychus urticae is one of the most important pests of beans. This study was conducted to optimize the use of acaricides by Central Composite Design, CCD, and Response Surface Method, RSM, using Design Expert 7.00 software to reduce the use of chemical pesticides and to evaluate the optimal conditions for whole female mortality. Process input variables were in the temperature range of 25–30°C, 55–65% humidity and 200–1260, 900–2300, 69–2330  ml /1000 ml  H2O for Fenphyroximite, Propargitis and Fenazaquin, respectively. Eye– popping bean leaf discs were used for inoculation and bioassays. The results of analysis of variance confirm that the linear model and the dose and relative humidity factors are statistically significant with the best peak mortality of mite for Fenphyroximite, in H: 57.03% and D:1045.14 ml /1000 ml  H2O, M:22% and the significance of the 2FI quadratic model, temperature and relative humidity interactions for propargite mites with the lowest dosage,T:26.01 °C , H:62.97% about M:16% and linear model with humidity factor for use of Fenazaquin with best mortality rate of full female mites at H: 62.97%, D: 527.30 ml /1000 ml  H2O, about M: 9% which the most favorable conditions for use the three acaricides. s