Abstract
The oriental spider mite is the common name of Eutetranychus orientalis (Klien). The efficacy of Huwa-San TR50, abamectin and bifenthrin for the control of the oriental spider mite was evaluated under field and laboratory conditions. Seven concentrations of Huwa-San TR50 (500, 1000, 2000, 3000, 4000, 5000 and 6000ppm) and the recommended dose (RD) of abamectin and bifenthrin including a control (well water) were applied in the field and laboratory. E. orientalis were susceptible to certain concentrations of Huwa-San TR50 and the RD of abamectin and bifenthrin. All these substances produced a significant reduction on the adults' mortality of E. orientalis. Nevertheless, the compared efficacy showed differences as HuwaSan TR50 was found to significantly kill E. orientalis and can also cause a failure in the eggs hatching of E. orientalis under field and laboratory conditions. In addition, it caused a dose dependent on the population and number of larvae hatching form eggs of E. orientalis. In contrast, abamectin and bifenthrin can only cause a significant reduction on the population of E. orientalis whereas Huwa-San TR50 can cause a reduction on both the population and number of larvae hatching form eggs of E. orientalis, as Huwa-San TR50 can reduce the number of larvae hatching from eggs of by similar to 2-fold of the reduction gained with the application of the RD of abamectin and bifenthrin.
The application of Huwa-San TR50 would be considered as a promising method for controlling E. orientalis as it is environmentally friendly chemical compound compared with other acaricides such as abamectin and bifenthrin.