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spinach-verticillium-wilt-3L

Longitudinal section through the stem of a healthy spinach plant (left) and a spinach plant infected with Verticillium wilt (right). The plants were incubated in a moist chamber for a week after they were cut. Note the small black microsclerotia of Verticillium dahliae in the vascular tissue of the infected plant.
Photo Source: Lindsey du Toit