Phymatotrichum root rot

Phymatotrichum root rot is a plant disease caused by a fungus of the genus Phymatotrichum. One species, P. omnivorum, is known to cause root rot in cotton and over 2,000 other plant species, particularly in the southwestern United States. This disease is most severe in black, alkaline soils with a pH of 7.3 or higher and low organic matter. Symptoms can include wilting, yellowing leaves, and decay of the roots and lower stem. While Fusarium wilt, caused by a different fungus, shares some symptoms like wilting and stem discoloration, Phymatotrichum root rot is specifically associated with alkaline soil conditions.123