The pathogenic fungus Cryphonectria parasitica is a member of the Ascomycota. This necrotrophic fungus is native to East Asia and South East Asia and was introduced into Europe and North America in the early 1900s. The fungus spread rapidly and caused significant tree loss in both regions.
Chestnut blight
Chestnut blight affecting a young American chestnut
A chestnut tree that has been felled, with blight on its inner bark and trunk
Experimental trials by The American Chestnut Foundation at Tower Hill Botanic Garden in Massachusetts
In biology, a pathogen, in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ.
A photomicrograph of a stool that has shigella dysentery. These bacteria typically cause foodborne illness.
Magnified 100× and stained. This photomicrograph of the brain tissue shows the presence of the prominent spongiotic changes in the cortex, with the loss of neurons in a case of a variant of Creutzfeldt-Jakob disease (vCJD)
Two pinworms next to a ruler, measuring 6 millimeters in length
Brown rot fungal disease on an apple. Brown rot typically target a variety of top-fruits.
