Dutch elm disease (DED) is a disease of elm trees caused by three species of Ascomycota fungi: Ophiostoma ulmi, Ophiostoma novo-ulmi, and Ophiostoma himal-ulmi. There are also two subspecies of O. novo-ulmi: subsp. americana and subsp. novo-ulmi. The pathogen is spread by bark beetles, which inhabit and traverse different elms....
Rhodococcus fascians is a Gram-positive, pleiomorphic actinomycete that causes leafy gall formation in a wide range of plant hosts. This particular phytopathogen has been a focus of research at the Oregon State University Plant Clinic, a diagnostic laboratory. Phylogeny of R. fascians isolates obtained from Plant Clinic submissions was determined...