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Diseases caused by pathogens

A pathogen is a living organism or virus directly capable of causing disease. The term “disease” is defined as a harmful deviation from the normal functioning of physiological processes. Many taxonomically diverse organisms become phytopathogenic (cause plant diseases) under suitable conditions. Plant pathogens can be categorized by their formal biological classification (taxonomy).

Index of disease names and scientific names of their causal pathogens

The entries for diseases caused by pathogens have sections containing nomenclature and taxonomy; general information and importance; distribution and hosts; symptoms and signs; disease cycle; damage; prevention and management; selected references; and photographs depicting various stages of the pathogen and the damage caused.

Ice break

Pathogen name: Ruptio gelicidii Nature

Ink spot of aspen

Pathogen name: Ciborinia whetzelii (Seaver) Seaver

  • Revision 2024

Inland spruce cone rust

Pathogen name: Chrysomyxa pirolata G. Wint. in Rabenh.

Inonotus obliquus (Pers.:Fr.) Pilát

Disease name: Sterile conk trunk rot of birch

Inonotus tomentosus (Fr.:Fr.) Teng

Disease name: Tomentosus root rot

Isthmiella abietis (Dearn.) Darker

Disease name: Fir needle cast (Isthmiella abietis)

Isthmiella faullii (Darker) Darker

Disease name: Needle cast

Isthmiella quadrispora Ziller

Disease name: Fir needle cast (Isthmiella quadrispora)