Southern blight
lesions on the stem. As the damage progresses, it causes darkening and rotting of the stem, resulting in the destruction of the cortex and the main root [...] darkening and rotting of the stem, resulting in the destruction of the cortex and the main root. As a consequence, leaves higher up in the plant start yellowing [...] vigorous mycelium. The fungus may reduce the stand of the plants. Damping-off may occur during germination or establishment of the plant (seedling phase)