Toxicity of Some Acaricides Against Egg Stage of The Two-Spotted Spider Mite Metatetranychus urticaea Koch (Acari: Teranychidae) Under laboratory Conditions

Three acaricides (Hexythiazox , Etoxazole, Clofentezine ) were tested under laboratory conditions to evaluate the response of the two spotted spider mite Metatetranychus urticae Koch (Acari: Teranychidae) on AL-Baqa and Dair Alla populations. The responses of the mite population against pesticides were estimated by calculation of the median lethal concentration (LC50). According to LC50 values, toxicity of pesticides to the egg stage of two spotted spider mite showed that etoxazol was the highest toxic than clofentezine and hexythiazox. Dair Alla field strain was more sensitive than AL-Baqa field strain to etoxazol and clofentezine, but it is more resistant than AL-Baqa field strain to hexythiazox.,According to LC50 value in PPM of the field strain divided by LC50 of Syrian sensitive strain ; hexythiazox was less toxic than etoxazol and clofentezine .In addition , RF value of hexythiazox was very high against the two field strains . Therefore, hexythiazoxis is recommended to be unsuitable for use as a chemical pesticide for the two spotted spider mite control program.