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spinach-verticillium-wilt-2L

Longitudinal section through the root system of a healthy spinach plant (left), a spinach plant infected with Verticillium wilt (center), and a spinach plant infected with Fusarium wilt (right). Note the very light vascular discoloration caused by Verticillium wilt vs. dark, black discoloration from Fusarium wilt.
Photo Source: Lindsey du Toit