comparison of advanced wheat lines and cultivars resistance to sawfly (cephus pygmaues)

in order to performance this project, 16 number of advanced lines and varieties of wheat which received from spii section was evaluated to studying wheat resistance to wheat stem sawfly in kurdistan agricultural research station in qamlo. the study was based on complete randomized block design with 4 replications. in period of two years the different stage of growing of wheat’s lines and pest was studied. comparison of two years mean by means of tukey method showed that seven’s variety had the highest (3.75%) whereas sixteen’s variety (sardary) had the lowest infestation by sawfly. also comparison of thousand seed weight (tsw) between the infected and uninfected heads determined that six’s variety by 6.17 g reduction had the highest and nine’s variety by 1.33 g had the least reduction in tsw. in addition the results showed that seven’svariety by the number of 7 fallen bunches had the highest and sixteen’s variety by attention to its dominant in the region and to be control plant in this study by 3 fallen bunches had the lowest loses. in this study also the study of relationship between morphological characteristics such as number stem in bush, number node in stem, stem diameter, hardness and softness, to be empty or solid and smooth or coarse of stems was recorded and relation of each factor with the amount of bushes infestation studied and revealed that past’s wormsprefer the thick stems.