الفهرس 
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Abstract
The aim of this study to evaluate three groups of insecticides, organophosphate (Chlorpyrifos), phenylpyrazole or Fiprole (Fipronil) and pyrothroids (Cypermethrin), against Subterranean termites. Data concluded as follow : 1- In the topical application technique, insecticides needed 24 hours to kill highly numbers of termites. Cypermethrin was the more toxic at 12 hr., followed by chlorpyrifos and fipronil, respectively. At 24 hr. the highest toxicity was recorded by cypermethrin, fipronil and chlorpyrifos respectively. 2- In long-tube study the three tested insecticides were more toxic in sub-surface layers of treated soil with the coarse soil but the treated fine soil were more safety toxicity to the ground water. Fipronil showed the highly toxic, followed by cypermethrin and chlorpyrifos, respectively. Samples analysis resulted that the chlorpyrifos it’s more save for water table, while fipronil was the lower safety. Statistics analysis showed significantly between the tested factors. 3-The first washed of treated soil were the highly efficacy and quicker in the killed against termites of all tested particle sizes than second and third, respectively, and the small particle size were the quicker and more toxic than others in the first washed of treated soil. Also cypermethrin showed the highly toxic, followed by fipronil and chlorpyrifos, respectively. The treated coarse soil showed more toxic in the second and third than the fine. the washed samples analysis indicated that, the chlorpyrifos showed the higher safety followed by fipronil and cypermethrin. Statistics analysis showed highly significantly between the tested factors. 4-Termites tunneling ability with treated particle size of soil recorded that the tunneling and branching were the highest with the coarse treated soil, while were the least with the fine. Tunneling activity and branching decreased by the concentration increases. Treated soil with cypermethrin showed the best and the more toxic to prevention of tunneling and branching followed by fipronil and chlorpyrifos respectively. Statistics analysis resulted highly significant between the tested factor.