Anthracnose
scouted Sept. 26, 2024
- Scientific Name
- Colletotrichum destructivum
- Background
- Soybeans in Cumberland County were scouted, and it was observed that about 30% of the field was affected by randomized browning. The previous year (2023), the field was planted with tobacco and treated with Command 3E as well as Spartan herbicides. In 2024, soybeans were planted after a burndown of the ryegrass cover crop in May. Velum was applied at planting (4 oz/acre), along with Gromolone and Envive herbicides. Follow-up herbicides included Roundup and Liberty. The first insecticide application consisted of bifenthrin and boron, while the second insect spray was Beleaf. The soybean seed was untreated. Issues were present during early season but began to look better. After Tropical Storm Debbie, issues progressed and continued to worsen following heavy rainfall in late September. The field is very sandy, yet still held a large quantity of water. Samples submitted include plants from multiple locations, including both healthy and affected areas.
- 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.
- Resources
-
- No resources have been added.
