Ring spot

Mycosphaerella brassicicola

Symptoms consist of circular leafspots (0.5 inch in diameter) that range in color from light brown to black. With time these spots develop concentric rings much like a target pattern. Small spherical fruiting structures may also be observed within the leafspots. If disease is severe, some defoliation may take place. This pathogen may also infect the sprouts, causing dark lesions on outer leaves.