Aphanomyces euteiches is a destructive soilborne plant pathogen. This oomycete organism survives in the soil for decades and infects and degrades roots of plants from 11 families. Infected roots develop a golden-brown color, begin to disintegrate and the entire root system is destroyed. Symptoms of Aphanomyces root rot are gray and water-soaked roots and as the disease progresses, the roots become golden-brown, decayed and soft. Aboveground symptoms such as chlorosis and necrosis of leaves at the base of the plant follows. In the advanced stages of root rot, the cortical tissue surrounding the vascular tissue begins to slough off and can be removed easily.
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