 |
ProCrop |
Anthracnose
Anthracnose (Colletotrichum lindemuthanianum) is a potentially devastating disease that is not established in North Dakota commercial production. The most characteristic symptoms appear on the undersides of leaves where small, angular, reddish to purplish-brown lesions develop predominately along veins. Older lesions become darker, extend to the upper surface, and proceed along the veins. Pod lesions are very sunken, circular, chocolate brown to black with a raised dark margin surrounded by a thin zone of reddish tissue. On the lesion surface, tan spores dry into dark, granular masses.
Anthracnose is not established in North Dakota or Minnesota, but it is established in Manitoba, Michigan and Ontario. Its range in Manitoba includes the southern part of the province, near the North Dakota border.
Anthracnose can be blown from field to field in crop refuse, and it spreads within the field in splashing rain showers. It is seed borne and can be introduced into an area on seed.
The most important disease management procedure is to keep the pathogen out. Seed produced in infested areas should not be introduced for planting in North Dakota or Minnesota. Genetically resistant varieties and tested "pathogen free" seed are primary controls in areas where the disease is established. Several races of the pathogen are known.
Anthracnose resistant varieties available in our area all require a long growing season. The navy varieties Vista and Mayflower are resistant and the black varieties Black Knight, Jaguar and Phantom are resistant.
Chlorothalonil, Maneb, Azoxystrobin, and Topsin M are registered for anthracnose control. Multiple applications may provide moderate control, but the economics of control is questionable.
Back to Diseases - Dry
Beans Menu
Back to Dry Beans Menu
Back to Main ProCrop Index
