Soybean Phytophthora root and stem rot
scouted Aug. 10, 2023
- Scientific Name
- Phytophthora sojae
- Background
- Soybeans in Yadkin county, variety AG45XF2, were scouted and observed 50% of the field affected by Stem snaps off just above the soil. The lower leaves are turned a gray green color. Disease is in a random pattern but everywhere. The roots look healthy.
- Conclusion
- The issue was identified as Phytophthora root rot. Phytophthora root and stem rot of soybean is caused by Phytophthora sojae. P. sojae is not a true fungus, but belongs to a group of fungal like organisms called oomycetes (water molds). Cultural practices that improve soil drainage is important to limit the spread of P. sojae. Because infections often take place early in the growing season, use of a seed treatment or soil-applied fungicide may be beneficial to reducing infections by P. sojae. Chemistries containing mefenoxam or metalaxyl are both effective to reducing disease caused by P. sojae.
- Resources
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- No resources have been added.
