Cabbage ring spot on cabbage-Ghana: Mycosphaerella brassicicola (syn. Cercospora albomaculans) ; black ringspot of crucifers: PlantwisePlus Knowledge Bank: Vol Pest Management Decision Guides, No null
Fact sheet - Cabbage ring spot (286)
Spot Hogg Multiple Ring Technology: What is it and Why Does is Matter? - S&S Archery