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A plant disease is a dynamic process where a living or nonliving entity interferes with the normal functions of a plant over a period of time. Things that happen just once, like lawnmower blight or lightning strikes, are not considered diseases, but rather injuries. Plant diseases result in visible symptoms that can help diagnose the disease or disorder. Disease epidemics can also threaten entire plant species. Exotic pests can threaten the continued existence of a species. Historical examples of destructive plant disease epidemics include three American tragedies: American chestnut blight,...

Wood decay is a deterioration of wood by primarily enzymatic activities of microorganisms. For practical purposes, fungi are the only agents of wood decay. Fungi which grow on wood are sometimes called "lignicolous" fungi. But why develop a set of keys limited to fungi utilizing wood as a substrate? After all, being lignicolous does not define a taxonomic category. Lignicolous fungi include ascomycetes and basidiomycetes and a large number of classes and orders within each of these groups. Most of these taxa include both lignicolous and terrestrial species. Rather than taxonomy, the keys...