Anthracnose

scouted July 26, 2023

Scientific Name
Colletotrichum destructivum
Background
Soybeans in Montgomery county, variety AG54XFO, were scouted and observed 5% of the field was affected by dieback, browning and yellowing, in random areas of the field. The sample was taken pre-fungicide treatment. However, the majority of the field was healthy.
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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