Fungal mats are reliable indicators for
diagnosis of Oak Wilt in Red Oaks. They
most often form in the spring on Red Oaks
that developed advanced symptoms of Oak
Wilt, the previous late summer or Fall. Red
Oak infections in late Summer or Fall
usually do not produce fungal mats due to
high tempature and low moisture conditions
in the soil. Fungal Mats can be found by
looking for inconspicuous narrow cracks in
the bark, leading to hallow areas between
the bark and wood. They often have a
distinctive odor similar to fermenting wood.
Fungal mats can be exposed by chipping
or pulling away the loose bark.