Curling leaves and wilting branches are early symptoms of this fungal disease, which clogs the vascular system of infected plants and inhibits the flow of water and nutrients. Cut the stem of an infected plant near the base, and you’ll find that the stem interior is brown in color. In vegetable plants the disease progresses rapidly. Leaves turn yellow, then brown, and drop off; plants may succumb in just a few weeks.
In woody plants, such as trees, fusarium wilt may be present for years before the diseased plant dies. The fungus can survive in the soil for many years, and multiple strains have proven resistant to fungicides. Verticillium wilt causes similar symptoms.
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