Abstract
It has been studied the effect of three variaties of local wheat in Iraq which are : Sham6, Abu-Greb3 and Ibaa 99
in its three states ( whole, crashed, flour ) on the feed preference and the development average of Tribolium
castanium (Herbst) and Troguderma granarium (Everts.) under laboratory conditions. The result showed that
there are significant differences in the larval, pupal development stages, preoviposition and eggs incubation
period, the results showed that during the development stage concerning the T. castaneum and the development
was absent in the case of whole, the results have also showed the present of significant differences concerning
the general average of development period for the insect, where the T. castaneum showed the highest
development period on the crashed grains which reached 23.1 days, and in the flour grains it reached 20.3 days
whereas the highest development period for the T.granarium on whole grains was 32.76 days followed by the
flour in 29.73 days than crashed grain 28.20 days. Also found the present of significant differences in the
preference of the larvae of bath insects for the varieties and cases of grains in the number of attracted larvae to
each state, T. castaneum preferred the flour and crashed Ibaa99 with the average of 10.3% and 10.0% larvae
respectively, while lower number of larvae in case of the whole grain state of Sham6 with the average of 2.6%
larvae, the T.granarium preferred the crashed and flour Ibaa99 with the average of 8.3% and 8.0% larvae
respectively, while low in the whole grain state of Abu-Greb3 with the average of 2.6% larvae
in its three states ( whole, crashed, flour ) on the feed preference and the development average of Tribolium
castanium (Herbst) and Troguderma granarium (Everts.) under laboratory conditions. The result showed that
there are significant differences in the larval, pupal development stages, preoviposition and eggs incubation
period, the results showed that during the development stage concerning the T. castaneum and the development
was absent in the case of whole, the results have also showed the present of significant differences concerning
the general average of development period for the insect, where the T. castaneum showed the highest
development period on the crashed grains which reached 23.1 days, and in the flour grains it reached 20.3 days
whereas the highest development period for the T.granarium on whole grains was 32.76 days followed by the
flour in 29.73 days than crashed grain 28.20 days. Also found the present of significant differences in the
preference of the larvae of bath insects for the varieties and cases of grains in the number of attracted larvae to
each state, T. castaneum preferred the flour and crashed Ibaa99 with the average of 10.3% and 10.0% larvae
respectively, while lower number of larvae in case of the whole grain state of Sham6 with the average of 2.6%
larvae, the T.granarium preferred the crashed and flour Ibaa99 with the average of 8.3% and 8.0% larvae
respectively, while low in the whole grain state of Abu-Greb3 with the average of 2.6% larvae