Club root

Plasmodiophora brassicae

Symptoms vary slightly from host to host. The first observable above ground symptom is day wilting. Otherwise healthy looking plants wilt on hot dry days, recovering once the sun sets or temperatures cool. As the disease progresses, leaves yellow and die. Diseased plants are obviously stunted compared to uninfected plants and will often be localized in low, wet areas of the field. When dug up, roots exhibit a variety of symptoms. New infections cause small knot like galls on roots, where as more developed infections display long spindle shaped clubs on primary and lateral roots. Some hosts, such as turnips and radishes, do not form clubs when infected. These hosts have black sunken lesions along the root surface.

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