The first signs of Verticillium wilt that you may notice are individual branches that suddenly wilt and die. Affected branches may occur on one side of the tree or may be scattered throughout the tree. If you carefully peel away the bark of these branches, you may see brown or green streaking in the sapwood. Streaking is common in trees such as maple or redbud, but often is not visible in ash.
Remove and destroy severely infected trees, removing as much of the root system as possible. In severe cases, it may be necessary to plant only resistant genera (all gymnosperms, Betula, Carya, Celtis, Chaenomeles, Crataegus, Fagus, Gingko, Gleditsia, Juglans, Malus, Populus, Pyrus, Quercus macrocarpa & Q. alba, Salix and Sorbus) on sites with high numbers of Verticillium propagules in the soil. A soil test is availible to determine the number of propagules present. Control weeds, such as velvet leaf, that are susceptible to Verticillium.
If considering a nursery area for new plantings, soil fumigants can be used to prepare the area.
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