Abstract
Field experiment was conducted to estimate the damage caused by number of nymphs and adults of Sunn Pest Eurygaster integriceps Puton to four wheat varieties (Aras, Tamuz-2, Atra,S and Crezo) In Duhok province during both seasons 2004-2005 and 2005-2006. It has been shown that if there is increasing in the adult Sunn Pest from one pair to five pairs/m2 and from five to ten nymphs/m2, there would be decreasing in the weight levels of 1000-grain, grain yield (Kg/donum) and protein sedimentation value/cm3 for wheat varieties Aras, Tamuz-2, Atra,S and Crezo. The above studied characters have influenced greatly in the case of bread wheat in comparison with the durum wheat. The weight of 1000-grain, grain yield and protein sedimentation for durum wheat reached 42.99, 42.91 g & 980.91, 963.24 Kg/donum & 17.95, 16.36 cm3 compared with bread wheat 28.28, 27.89 g & 825.64, 826.21 Kg/donum & 23.02, 23.83 cm3 for two seasons, respectively.