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Fusarium Yellows
Fusarium yellows has been identified by field symptoms, and the pathogen (Fusarium oxysporum f.sp. phaseoli) has been isolated from plants in a systematic field survey. The pathogen is soil borne and can penetrate roots directly through wounds. The pathogen plugs the vascular tissue in bean roots and stems. Initial symptoms are yellowing and wilting of lower foliage. Yellowing and wilting progress upward into the youngest foliage. Plants become stunted and leaf margins become necrotic. Severely infected plants wilt permanently, defoliate, and die. Symptoms are sometimes confused with nutrient deficiencies, but discoloration of the vascular tissues is diagnostic. Crop rotation, seed protection (high vigor plus fungicides) and cultivation practices that promote good root growth help control the disease. Resistance genes have been identified.
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