Abstract
The results of testing low concentrations of the insecticides: Cerin, Sibex, and Sypermethrin showed high significant percentages of killing the larval and adult stages of T. confusum and Trogoderma granarium comparing with hop leafs extract and garlic slices, reached 90 % for the adults and 100 % for larvae when Cerin insecticide used at 100 ppm, and 100 % for adults and larvae when Sibex used, and 93 % for the adults and between 93 % with ٍSypermethrin at 150 ppm concentration, while garlic slices gives 10 to 17 % for the adults and larvae of the red flour beetle( T. confusum). On the other hand the lowest concentrations of the three insecticides showed higher effects on the larval and adult stages of Khapra beetle (T. granarium). The percentages of dead insects 100 % for the adults 90 % for larvae when Cerin insecticide applied at 100 ppm concentration, and 93 % for adults and 80 % for larvae when Sibex used, while 90 % for the adults and 80 % for larvae when Sypermethrin applied at the same concentration. While the highest concentrations showed higher percentages of death for the two stages of the insect. Values of LD50 for the three insecticides against the flour beetle adults were: 0.028, 0.069 and 0.075 ml / L. , while these values for the adult Khapra beetle were: 0.021, 0.017 and 0.037 ml / L., moreover values of LD50 for the larval stages of flour beetle were: 0.028 , 0.074 and 0.076 ml / L. and that for the larval stage of Khapra beetle were : 0.023, 0.031 and 0.035 ml / L. for the three insecticides respectively . The extract of hop leafs showed no any effect against the two stages of the two beetles even the used concentrations were so high.
