Callery pear is one of the most rapidly-spreading invasive plants in the eastern U.S. This plant stems from cultivars of ornamental pears, most commonly the Bradford pear. Callery pear can have long thorns, and grows singly or in thick patches in old fields, roadsides, or forested areas.

Rhizoctonia blight is typically published as a fungal disease pathogen causing blight or mortality in seedling stock of pine nursery beds.

Bot canker is a serious pathogen of landscape and ornamental trees. This fungus is opportunistic and generally requires a weakened or damaged host.

Fungal Conks, or mushrooms growing from the trunk or base of a tree, are an indication that a rotinducing pathogen has taken up residence. Some of these fungi are significantly less harmful than others, but all warrant further investigation.