Chemical used to eliminate a pathogen from a host or an environment.
A compacted mass of hyphae that supports sexual fruiting bodies.
Note the black stroma within this sunken eastern filbert blight canker.
Photo by Jay W. Pscheidt, 1990.
Outermost whorl of organs of a flower.
Clear, translucent.
A strain of a pathogen characterized by the limitation of its host range to certain species and varieties of plants.
Strong ability to produce disease.
Progressive death of shoots, branches, and roots generally starting at the tips.
Dieback of these shoots on mountain hemlock.
OSU Plant Clinic Collection, 2010.
Nematode that tunnel into the roots, establishing permanent feeding sites from which they do not move. They may protrude from roots as they grow. (Examples: root-knot, Meloidogyne spp.; and cyst nematodes, Heterodera spp.)
A substance that prevents, retards, or destroys microorganisms.
A major group of fungi for which no sexual production of spores is known.
