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The vascular discoloration just above the soil line in this cowpea stem is characteristic of Fusarium wilt, caused by <i>Fusarium oxysporum</i> f. sp. <i>tracheiphilum.</i>. — The vascular discoloration just above the soil line in this cowpea stem is characteristic of Fusarium wilt, caused by Fusarium oxysporum f. sp. tracheiphilum..
Credit: Carol A. Frate