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The laboratory experiments were conducted to study the effect of Exposure Period and Concentration of Abrasive dust (Silica gel, Limestone and Gypsum) on Killing effect of larva and adults of Trogoderma granarium Everts. under laboratory conditions (25±5Cº and 65±5% R.H) in College of Agricultural and Forestry. Mosul University 2013. The results showed that the killing percent was clearly increased So as to increased of Concentration. The Silica gel Exhibit highdoi:10.33899/magrj.2018.161509 fatcat:r5drcsfk5vf3lbpxfk54xytbk4