Armillaria mellea
"Armillaria mellea" typically infects hardwood trees and conifers but sometimes will infect non-woody monocots and a few herbaceous plants. There are few signs, and the ones that do exist are often hard to find. The most prominent sign is honey-colored mushrooms at the base of the infected plant. Additional signs include white, fan-shaped mycelia and black rhizomorphs with diameters between 1/32nd of an inch and 1/8th of an inch. These usually are not as noticeable because they occur beneath the bark and in the soil, respectively. The symptoms are much more numerous, including slower growth, dieback of branches, yellowing foliage, rotted wood at base and/or roots, external cankers, cracking bark, bleeding stem, leaf wilting, defoliation, and rapid death. Leaf wilting, defoliation, and dieback occur after the destruction of the cambium.