Pest identification
and confirmation—Armillaria root rot (Oak root fungus)
To confirm the presence of Armillaria, look for thin white leathery patches of fungus by carefully peeling
the bark away from the trunk just below the soil line; if the fungus has not girdled the tree, check
several areas. The fungus has a characteristic fresh mushroom odor and occasionally after a heavy rain
in fall it may form clusters of mushrooms at the base of infected trees. Dark shoestringlike structures
develop and grow into the healthy underground tissue. | 
Mushrooms
may form at the base of trees
Shoestring
structures of Armillaria root rot
|
