Verticillium is a soil-borne fungal disease of many fruit, vegetables and ornamental plants that enters the plant through the roots. Infection with this fungus causes dieback and the leaves to wilt. The spots may be confused with alternaria early blight, but they are not definite, nor do they develop concentric bull's-eye rings.
Verticillium wilt diseases are difficult to control due to the long viability of the resting structures, the broad host range of the pathogens, and the inability of fungicides to eliminate the pathogens once they have entered the xylem tissues of the plant.
Verticillium of alfalfa is a disease which can cause serious stand thinning and yield loss in third year or older alfalfa fields.
The soilborne fungus Verticilliurn albo-atrum is present in most assuredness grimes of the northeasterly and dismiss impound over 200 plant species. Peculiarly Lycopersicon esculentum, spuds, garden egg, strawberry mark, and black raspberries. Another hypersensitive vegetables include globe artichoke, Beta vulgaris, European bean. Chicory root. Cucumis sativus, dandelion, Cichorium endivia, horseradish, muskmellon, okra. peppers, radish, rhubarb, salsify, and watermelon. Corn, other cereals, and grasses are nonabsorbent. When infecting ornamental trees like maples, elms, aspen, ash, beech, catalpa, oak and others, the first symptoms are midsummer wilting on one side of a tree or branch. The sapwood has greenish or brownish streaks, and the infection can take a few years to progress to the rest of the tree or move rapidly.
Many eudicot species and cultivars are resistant to the disease and all monocots, gymnosperms and ferns are immune.
Rather, under good conditions of moisture and nutrition, yellow blotches on the lower leaves may be the first symptoms, then brown veins appear, and finally chocolate brown dead spots.
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