Close-up view of hypoxylon canker (Hypoxylon mammatum) on the trunk of an aspen tree (Populus tremuloides).
Symptoms of hypoxylon canker (Hypoxylon mammatum) on the trunk of an aspen tree (Populus tremuloides).
Canker of Populus tremula caused by Hypoxylon mammatum.
canker on stem
10" dbh aspen girdled by canker