Anthracnose

scouted Sept. 7, 2021

Scientific Name
Colletotrichum destructivum
Background
Soybeans in Pitt county, variety Pioneer 52A26R, were scouted and observed with 3% of the field being affected by browning/yellowing as well as blight and canker in patches throughout the field. The site was sunny and excessively wet for much of the growing season but became very dry for 2-3 weeks.
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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