evaluation of some acaricide agents against hard ticks

two hundred and ninty four engorged female ticks were collected from 4 different geographical regions for assessment of tick resistance against acaricide compounds.the 15-21 day- old larvae have been tested in accordance with fao recommended larvae packet test .resistant factor for each region was calculated by lc50 and lc99. minimum lc50 (0.008)and, maximum lc50 (0.024) for amitraz were seen in arid and northern regions with resistant factor equal 3. minimum lc50 (0.001) and,maximum lc50(0.003) for cypermehtrin were seen in mountainous and southern costal regions with resistant factor equal 3. minimum lc50(0.003) and maximum lc50 (0.014) for diazinon were seen in the northern and arid regions with resistant factor equal 4.7. in comparison with probit test results, the applied concentrations denote amitraz and cypermethrin at recommended concentration do not slay 100% of the larvae in the northern and arid region. however diazinon can slay all the larvae even at concentrations lower than the recommended doses.