Fusarium wilt (Yellows of cabbage)—Fusarium oxysporum
f. sp. conglutinans
Fusarium wilt can destroy susceptible cultivars of cabbage; cauliflower, broccoli, and brussels sprouts
are not known to be affected. Symptoms consist of the yellowing of the lower leaves, often on one side
of the plant. These leaves later turn brown and drop off. A brown discoloration of the water-conducting
tissues is characteristic of this disease. With time, the entire plant may yellow, wilt, and collapse.
Once present, this fungus survives indefinitely in the soil. Avoid introducing the pathogen to clean
fields. In areas where the fungus is known to occur, plant cabbage in spring or winter, as this fungus
develops most rapidly at temperatures ranging from 75° to 85° F. Some resistant cabbage cultivars are available.
yellows of cabbage