Bean Anthracnose: Colletotrichum lindemuthianum
Symptom:
-
Bean pods with black, sunken lesions or reddish-brown blotches most likely have anthracnose, a fungal disease caused by Colletotrichum lindemuthianum.
-
Black, sunken lesions about ½ inch in diameter develop on stems, pods and seedling leaves (cotyledons) but are most prominent on pods.
-
A salmon-colored ooze on lesions and the veins on lower leaf surfaces turns black. On lima beans, symptoms are sooty- appearing spots on leaves and pods.
-
Anthracnose develops primarily during the spring and fall when the weather is cool and wet, and not during our hot, dry summers. Lima beans are particularly susceptible.
Management:
-
Prevent this disease by using the certified disease-free seed for planting and removing all plant debris after harvest.
-
Anthracnose can survive in the soil for two years on plant debris or be brought to the garden on infected seeds.
-
Do not plant bean seeds in an area that had the disease for two to three years. Avoid overhead watering and avoid splashing soil onto the plants when watering.
-
Fungicide sprays of fixed copper are the only recommended chemical that can be used on lima beans for anthracnose control.
Source-
- TamilNadu Agritech Portal
