Anthracnose

scouted Aug. 15, 2024

Scientific Name
Colletotrichum destructivum
Background
Soybeans in Iredell County, variety P42A84E were scouted, and it was observed that 5% of the field was affected by browning and yellowing, as well as root rot and stem rot in localized areas of the field. The field is a wet site. Soybeans were planted in a river bottom. A sample was submitted to the PDIC for diagnosis.
Conclusion
The cause of disease was identified as Anthracnose, caused by Colletotrichum. While usually a disease that shows in the stems and the petioles, it can also cause leaf curling and reddening of the veins. Warm, wet weather favors infection and disease development. Crop rotation and tillage can reduce inoculum, while foliar fungicides will reduce disease, but it's usually not profitable.
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