Seedling Root Rot and Postemergence Damping-Off . This stage occurs after the seedlings have emerged from the soil. Affected seedlings first turn light green and are stunted. As the disease progresses, seedlings wilt and then die. Symptoms on the affected seedlings vary according to the causal fungus involved.
Black root rot seedling disease.
Note coal-black tap root. Pythium causes a watery, straw colored decay of the roots. Pythium seedling disease is most severe during cool, wet conditions. Pythium seedling disease. Pythium seedling disease.