Abstract
Verticillium dahliae isolates assigned to subgroups A and B of vegetative compatibility group 4 (VCG 4A and 4B) were tested for virulence to potato and ability to interact with the root-lesion nematode Pratylenchus penetrans in field microplot and greenhouse experiments. Microsclerotial inocula and the Verticillium-susceptible potato cultivar Superior were used. No differences in virulence were found between isolates from VCG 4A and 4B when plants were grown in soil infested with V. dahliae only. In contrast, plants grown in soil infested with V. dahliae isolates from VCG 4A plus P. penetrans exhibited higher disease severity and had lower tuber yields than plants grown in soil infested with V. dahliae isolates from VCG 4B plus P. penetrans [...]
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