Rhizoctonia crown and stem rot
scouted July 6, 2022
- Scientific Name
- Rhizoctonia sp.
- Background
- Soybeans in Onslow county, variety Pioneer 68AX07, were scouted and observed 10% of the field was affected by nutritional deficiencies. The new growth appears to have a bleached appearance. Corn was planted in 2021, and exhibited some of the same signs. There are high spots and low spots in sunny portions of the field are experiencing these symptoms.
- Conclusion
- This issue was identified as Rhizoctonia crown rot and Rhizoctonia stem rot. Rhizoctonia crown rot 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. Rhizoctonia stem rot can result in both pre- and post-emergence damping-off, leading to delayed emergence and stunting of infected seedlings. Rhizoctonia prefer warm and moist soil conditions.
- Resources
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- No resources have been added.
