Abstract
A high level of overall and seasonal variability of the Krasnodar greenbug population in terms of its virulence to sorghum and barley resistance genes, as well as RAPD markers, was discovered. Selection of insect genotypes specifically adapted to host plant species was recorded. Aphid clones that were avirulent to resistant sorghum samples were most abundant on barley. Greenbug migration from barley to sorghum led to rapid accumulation of clones that are virulent to sorghum resistance genes: Sgr1-Sgr4 and Sgr12. After alteration of the host, a significant shift of genotype groups similar in RAPD profiles was observed. Distribution of RAPD markers was independent of alleles of virulence of the insect.
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