Investigation of the tolerance of promising lines of durum wheat and two wheat cultivars to E. integriceps in Neyshabur

The Sunn pest, E. integriceps, is the most important pest of wheat fields in Iran. In order to investigate the lines of Durum wheat in terms of resistance to E. integriceps, was conducted experimental in 2016, Neyshabour Research Center. The experimental design was a randomized complete block design with three replications. The treatments consisted of 20 genotype: 18 lines of durum wheat, two cultivars of Dena control and Parsi wheat cultivar. According to the results, the highest number of overwintered adults of E. integriceps was located in genotype 1 (Dena wheat) and the lowest in genotypes 12, 2 (Persian wheat) and 16. The highest number of damaged leaves was in genotype 11 and the lowest number was in genotypes 16, 10 and 6. Investigating the traits of number of sprouts showed that genotypes number 1 and 6 had the highest and lowest number of buds respectively. The days to spike emergence and number of days to physiological treatment were affected by the treatments. The highest number of days until the appearance of spike was genotype number 18 and the least of these traits were genotypes number 9, 1, 11 and 14. The maximum length of peduncle was recorded in genotypes Number 11, 9 and 15, and the lowest peduncle length was observed in genotypes1 (Dana), 16, 18 and 19. There was no significant difference between the 20 genotypes in terms of yield, biological yield and harvest index. Genotypes 1, 13 and 18, along with the important indices of Yp, Ys and GMP in the region with high production potential and low sensitivity to E. integriceps Genotypes adjacent to SSI and TOL sensitivity indexes (Genotyp 4) are also low 1000 seeds weight. Weight of 1000 grains in non-activity of E. integriceps condition (Yp) had a positive and significant correlation with geometric mean (GMP), stress tolerance index (STI) and yield index (YI). Weight of 1000 seeds in terms of activity of E. integriceps (YS), was a positive and significant correlation with all indices. Accordingly, the mean of productivity (MP), geometric mean (GMP), stress tolerance index (STI) and yeild index (YI) were the only indices that showed a positive and significant correlation with grain yield in terms of E. integriceps activity and E. integriceps inactivity. Finally, within the scope of the study, three genotypes 1, 13 and 18 were sunn pest tolerant genotypes in Neyshabur region and genotypes 4, 7 and 15 were susceptible to sunn pest with lowest 1000 seeds weight.