Invasive microbes are introduced microorganisms which are usually single-celled, or too small for the unaided eye to see, including bacteria, viruses, protists, and fungi.

• Legal Definitions - Executive Order 13112
  USDA. NAL. National Invasive Species Information Center.
• Invasive Species Definition Clarification and Guidance White Paper (PDF | 104 KB)
  Submitted by the Definitions Subcommittee of the Invasive Species Advisory Committee (ISAC), Approved by ISAC Apr 27, 2006.

Use our Microbes Custom Search Engine to search for invasive species information included in this section of NISIC's site:

Listed below are the microbial species for which we have completed species profiles - general information about microbial species commonly known as invasive. This is not a list of all invasive microbial species, nor does it have any regulatory implications. These profiles are provided as an educational informational tool.

Species not Established in the U.S.

Animal Pathogens

Avian Influenza (Orthomyxoviridae)
Exotic Newcastle Disease (Paramyxovirus)
Fowlpox (Avipoxvirus)
Viral Hemorrhagic Septicemia (Novirhabdovirus)
West Nile Virus (Flavivirus)
Whirling Disease (Myxobolus cerebralis)
White-Nose Syndrome

Plant Pathogens

Citrus Canker (Xanthomonas axonopodis)
Citrus Greening (Liberibacter asiaticus)
Dogwood Anthracnose (Discula destructiva)
Dutch Elm Disease (Ophiostoma ulmi and Ophiostoma novo-ulmi)
Gladiolus Rust (Uromyces transversalis)
Late Blight (Phytophthora infestans)
Laurel Wilt (Raffaelea lauricola)
Plum Pox (Potyviruses: Potyviridae)
Southern Bacterial Wilt (Ralstonia solanacearum)
Soybean Rust (Phakopsora pachyrhizi, Phakopsora meibomiae)
Sudden Oak Death (Phytophthora ramorum)
Thousand Cankers Black Walnut Disease (Geosmithia morbida)(Dec 14, 2010)
White Pine Blister Rust (Cronartium ribicola)