Cotton
Root Rot (fungus - Phymatotrichum omnivorum): This disease occurs in
heavy alkaline soil but is not a problem in the High Plains, Panhandle areas,
or the Brazos River bottom. Areas of dead plants occur in fields, usually in a
circular pattern. Brownish, fuzzy strands of the fungus often appear on affected
roots (See Illustration). The bark is dead and rotted on the tap root. When affected
plants are pulled, they usually break off easily at or near the soil surface.
It occurs in warm weather following rain or irrigation. (See
section on Cotton Root Rot)
