|
Email Page
|
Print Page
|
New Search
|
Back To Search Results
|
|
|
|
| Anthracnose |
Photo Identification |
|
- Pest Type: Disease
- Crops Affected: Pulse crops, Lentils, Soybeans, Legumes, Beans (all types)
- Scientific Name: Colletotrichum dermatium var truncata; Glomerella glycines
Symptoms
This fungal disease can be caused by either of two fungi. Glomerella glycines generally infects older plants. These fungi produce similar symptoms of reddish brown or dark brown areas on infected stems and pods; and in later stages, scattered black dot-like structures develop on the stems and pods. Stems, pods, and leaves may be infected without showing external symptoms until weather conditions become favorable for further disease development. Anthracnose-infected seeds may be shriveled and moldy, or they may show no visible signs of infection. Infected seeds will have reduced germination and damping off. Dark brown sunken cankers may develop on the cotyledons of young seedlings.
Disease Cycle
These fungi overwinter as mycelium on infected seeds or on soybean crop debris. They spread to healthy plants in the spring, favored by warm moist weather. Mainly seed-borne but may be stubble-borne. Infected seed produces seedlings with diseased cotyledons, where sporulation occurs. Spread in the field is by rain-splash, wind and machinery.
Control Measures
Plant healthy seed that has been treated with an approved fungicide, apply foliar fungicides if needed, and rotate soybeans with nonhost crops such as corn, grain sorghum, cotton or forages.
|
|