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 evaluatethe response of the two spotted spider mite metatetranychus urticae koch (acari: teranychidae) on al-baqaand dair alla populations. the responses of the mite population against pesticides were estimated by calculationof the median lethal concentration (lc50). according to lc50 values, toxicity of pesticides to the egg stage oftwo spotted spider mite showed that etoxazol was the highest toxic than clofentezine and hexythiazox. dair allafield strain was more sensitive than al-baqa field strain to etoxazol and clofentezine, but it is more resistantthan al-baqa field strain to hexythiazox.,according to lc50 value in ppm of the field strain divided by lc50of syrian sensitive strain ; hexythiazox was less toxic than etoxazol and clofentezine .in addition , rf value ofhexythiazox was very high against the two field strains . therefore, hexythiazoxis is recommended to beunsuitable for use as a chemical pesticide for the two spotted spider mite control program.