Fusarium wilt (Fusarium oxysporum f.sp.vasinfectum)
This fungus is seed- and soil-borne. Diseased plants are stunted. Leaves of diseased plants turn yellow, wilt and later are shed. Usually the lower leaves are first affected. When a stem or main root of diseased plant is cut crosswise, brown discolouration is usually found in the ring just beneath the bark. Wilting of plants is mostly gradual. Water stress, warm soil temperatures, acidic soils and high content of nitrogen in the soil favour the disease. Infestation by root-knot nematodes aggravates Fusarium wilt.
- Use certified disease-free seeds.
- Treat seeds with a biopesticide preparation of Trichoderma viride (commercially available in Kenya).
- Control root-knot nematodes.
- Practise regular irrigation.
- Control weeds.
Fusarium oxysporum f.sp.vasinfectum