Abstract
The study was conducted in Swaratuka region in Dohuk governorate during October 2002 on the occurrence of oak seed weevil Curculio longipennis Rett on oak trees of Quercus aegilops L. to evaluate the effect of interaction between the direction of forest and the direction of trees with its highest on the percentage of infestation, and the number of larvae in the seed. Statistical analysis showed that there were significant differences at probability 0.05 between the direction, highest for the forest and trees on the characteristic under study. West direction of forest and tree were represented high percentage of infestation and the same direction of the forest and east of the tree were represented high average number of larvae 2.23 at the highest more than 3 m for trees, but the north direction of the forest and north of tree at the highest under 3 m were represented a lower percentage as 28.16% and 0.53 larvae for characteristic under study respectively. Finally the percentage of germination of non-infesting oak seeds or which infested with one larvae, tow larvae, three larvae or four larvae and more, under natural condition of Mosul region (average temp. 12cْ and 58% relative humidity) were 72.6, 66.66, 48.22, 21.22, 8.53 % ,respectively.
