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Fusarium wilt of lettuce. Symptoms. The first symptoms of Fusarium wilt may occur as early as thinning, when some seedlings wilt and die. Infected plants display a characteristic red-brown streak extending from the upper taproot into the cortex of the crown. Older affected heads exhibit a tipburn that may often be limited to one side of the plant. Yellowing of leaves and a brown to black streaking of the foliar vascular tissue is often present.  1, fiche 1, Anglais, - Fusarium%20wilt%20of%20lettuce

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