- Acremonium wilt is a soil-borne fungus that causes wilting, yellowing and death of the lower leaves. Leaves may also be stunted and vascular tissue turns brown. Symptoms are more severe if the soil is overly wet. Control this wilt disease by fumigating the soil with methyl bromide-chloropicrin.
- Symptoms of verticillium wilt include yellowing and wilting leaves. As the disease progresses, the plants turn brown, usually starting at the base of the plant and working its way up. The vascular system, which moves water throughout the plant, develops a brown, olive-green or reddish discoloration that can be seen when the stem's cut open. Older leaves often show symptoms while younger leaves appear healthy. Control verticillium wilt by removing and destroying infected plants. Ensuring that flowers are properly fertilized and watered will help them resist this disease.
- Fusarium wilt is often confused with verticillium wilt because the symptoms are similar. Leaves turn yellow and wilt and, the vascular system develops a reddish-brown discoloration. Fusarium wilt infects Shasta daisies through their root system and spreads on contaminated tools and pots. Chemical fumigation of the soil can reduce the presence of this fungus in the soil, but won't completely eliminate it. Liming the soil to adjust the pH to 6.5 to 7.0, and using nitrate nitrogen fertilizer helps control fusarium in Shasta daisies.
- White, cottony fungal threads, and large, black fruiting bodies, form in and on the stems, when Shasta daisies have cottony rot disease. In addition, plant tissues appear bleached. This fungal infection causes plants to wilt and die. The soil needs to be very moist for at least 10 days before the fungus can germinate. Cottony rot spores only infect injured plant tissue but, the disease can spread to healthy plants if diseased plants come into contact with them. Fungicides can be used as protectants.
- There is no cure for bacterial leaf spot, which is caused by the Pseudomonas cichorii bacterium. This disease causes brown spots and blotches to appear on the leaves of Shasta daisies and other host plants, along with wilting of the leaves. Spots are usually surrounded by a yellow halo. As the disease progresses, the spots spread and get larger along the veins. To reduce problems with leaf spot, only plant disease-free plants. Avoid watering plants from overhead and don't handle wet plants. Remove and destroy infected plants, along with plants growing near them. Control whiteflies that spread bacteria.
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