Verticillium Wilt of Yellow Poplar

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Abstract
The pathogenicity of Verticillium dahliae and V. albo-atrum to yellow poplar (Liriodendron tulipifera L.) was demonstrated. V. albo-atrum ATCC 13542 from Acer platanoides L. (Norway maple); V. dahliae ATCC 11405 from Menthapiperita L. (peppermint); V. dahliae ATCC 18697 from Solanum tuberosum L. (potato); V. albo-atrum ATCC 13391 from S. tuberosum L. (potato); V. dahliae ATCC 16535 from Lycopersicon esculentum Mill. (tomato); V. albo-atrum ATCC 26001 from L. esculentum Mill. (tomato) were tested for pathogenicity to maple, yellow poplar, eggplant (Solanum melongena L. ''Black beauty''); tomato (L. esculentum Mill. ''Bonnie Best''); potato (S. tuberosum L. ''Katahdin''), and dahlia (Dahlia pinnata Cav.). The order of relative susceptibility of these hosts, from most to least, was eggplant, maple, tomato, yellow poplar, potato and dahlia. Cultures from root and soil samples collected in a survey from 96 yellow poplar sites located in woodlots throughout Delaware [USA] indicated an incidence of Verticillium spp. of 14.6%. V. albo-atrum was isolated from the roots of asymptomatic mature yellow poplar trees and diseased yellow poplar seedlings; whereas, V. dahliae was isolated only from rhizospheres. Eleven isolates obtained from the survey all induced disease when inoculated into yellow poplar or cv. Bonnie Best tomato seedlings.

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