Mass screening of 76 barley genotypes for resistance to Russian wheat aphid Diuraphis noxia (Hom.: Aphididae), in greenhouse condition

Russian wheat aphid, Diuraphis noxia (Mordvilko), is a serious pest of cultivated barley, Hordeum vulgare L., in many parts of Iran. A greenhouse study was conducted to identify resistance of 76 barley genotypes along with oat, Avena sativa, as a resistant check. Test was arranged in complete randomized designs with four replicates. Plants were infested by different stages of D. noxia in first leaf stage. Twenty one days after infestation, resistance indices including: damage rating, stunting, percentage of leaf rolling and growth of infested plants in compared with control plants were estimated. We did not find highly resistant or highly susceptible genotypes in this study. On the base of three traits (damage rating, stunting, percentage of leaf rolling) genotypes and varieties: Desnod-navaro, Lokht, Makoei, B6, U.N.K, 74B4-4709, 74B4–4720, 74B4–4807, M73urbyt-1, 74B4–4814, M73urbyt-6 and M73 urbyt -14 were resistant, whereas other genotypes classified from moderate to highly susceptible.