Verticillium albo-atrum and Verticillium dahliae, the fungi that cause Verticillium wilt, can attack more than 200 plant species, including potato, pepper, eggplant, strawberry, watermelon, and radish. Like Fusarium wilt, this disease appears first on the lower leaves and progresses upward. Yellow blotches develop on lower leaves; the leaves rapidly turn completely yellow, wither, and drop off.
Unlike Fusarium wilt, symptoms of Verticillium wilt do not progress along one side of a leaflet, branch, or plant. Infected plants may survive through the growing season, but are stunted and yield is reduced. Verticillium wilt, like Fusarium wilt, causes internal browning of the water-conducting tissue in stems. The discoloration is most pronounced near the soil line and seldom extends more than 10 to 12 inches above this point.
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