Rhizoctonia crown and root rot
scouted Sept. 8, 2021
- Scientific Name
- Rhizoctonia sp.
- Background
- Soybeans in Onslow county were scouted and observed with 5% of the field affected by defoliation, yellowing in a mottle pattern, leaf spots, as well as scorch and burn in patches throughout the field. The field was in a low, sunny, and dry site.
- Conclusion
- The issue was identified as Rhizoctonia root rot and Rhizoctonia crown rot. Both diseases are caused by Rhizoctonia sp. Rhizoctonia root rot can result in both pre- and post-emergence damping-off, leading to delayed emergence and stunting of infected seedlings. Prevalence tends to increase in warm and moist, but not saturated soils.This issue was identified as Rhizoctonia Crown rot. The disease can occur under various moisture conditions, preferring warm and moist soil. It is more prevalent can be increased by plant stress from herbicide or hail injury or the soybean cyst nematode (SCN). To manage Rhizoctonia crown rot, it is recommended to encourage seedling health with good agronomic practices and the use of high-quality seed. Avoiding or reducing plant stress, such as from herbicide injury and SCN infection, is crucial. Crop rotation and tillage may be beneficial where disease has been severe. Some seed treatment fungicides can reduce Rhizoctonia infection for a few weeks after planting. However, no commercial corn or soybean cultivars are fully resistant to this disease.
- Resources
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- No resources have been added.
