Anthracnose

scouted Aug. 19, 2022

Scientific Name
Colletotrichum destructivum
Background
Soybeans in Wilson county, variety DG48xt90s, were scouted and observed 5% of the field was affected by defoliation, leaf spot, mold/mycelium, root rot, and stem rot randomly throughout. These soybeans are 4.8 maturity, close to senescence. Plant stems, crown and root are affected
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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