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When studying stored grain (Triticum aestivum) healthy and injured with numerical levels 5,10,20 apair of whole bugs of an insect Tribolium. castaneum(Herbest) and for two generations it is found that there is aspecific contamination of the following an aerobic bacterial speciesEscherichia.coli, Pro.mirabili , Klebsiella.pneumonia,Staphloccocus aureaus , S. epidermids , P. aerugenosathis level of quantitative contamination of the above bacterial species differed according to the numerical level of the initial infecation with the insect, where the highest rate tocontamination at the infection level 20 pairs where it was(1225*103) colony/ g and lower him at level 5 pair ,where it was (392*103) colony/ g.
Injured wheat seeds surpassed healthy ones in terms of numbers as it reached the total population of bacterial colonies isolated in the infected wheat (1885)*103colony/ g , while the total number of colonies on healthy grains (615)*103 colony/ g .
And the highest rate of bacterial contamination was at the exit of the second generation ,as the rates were (392,883,1225)*103 colony / g ,for level 5,10,20 pairs of insects respectively.