Brown Cubical Rot, caused by Polyporus schweinitzii USDA Forest Service Forest Health Protection, Southern Region Brown Cubical Rot, caused by Polyporus schweinitzii Importance.
Diseased trees are subject to windthrow and breakage.
Identifying the Fungus. When conks are produced on the base of trees, they are bracketshaped, while those arising from infected roots are supported by a stalk and are circular with sunken centers. The upper surface is reddish-brown with a light yellow margin and has a velvety texture. The underside is dark olive or green, with large irregular pores. Identifying the Injury.