Evaluation of resistance to Russian Wheat aphid, Diuraphis noxia in genotypes of wild barely, Hordeum spontaneum

Russian Wheat Aphid, Diuraphis noxia is an important pest on barely, which is also the vectors of viral diseases. In order to identify resistant genotypes, resistance of 30 wild barley genotypes, including international Hordeum spontaneum germplasms, was evaluated in the greenhouse experiments. In this experiment, plants infested with aphids at two-leaf stage and 21 days after infestation, were assessed qualitatively for leaf rolling and leaf chlorosis, based on a scale from 1 to 9 In the experiment, the content of chlorophyll a, b and total chlorophyll were evaluated. Results showed genetic variation among genotypes for leaf chlorosis and leaf rolling. Moreover, a significant positive correlation was found between leaf chlorosis and chlorophyll a and b, in general, according to all traits, genotypes of IG401552, IG140073, IG120794, IG40154, IG142356, IG119447, IG40155, IG38669, IG140189, IG1 and IG2 were placed in resistant group.