Northern fowl mite

Definition

A hematophagous mesostigmatid mite (Ornithonyssus sylviarum) that is a permanent ectoparasite of domestic poultry and wild birds, causing economic losses through reduced egg production, feed conversion inefficiency, anemia, and mortality at high infestation densities. Unlike the red mite (Dermanyssus gallinae), which resides in nest crevices and feeds intermittently, the northern fowl mite completes its entire life cycle on the host bird.

Etymology

Example

A commercial layer house in the Midwest detected Ornithonyssus sylviarum during routine inspection when birds showed feather soiling around the vent, pale combs indicative of anemia, and a 12% drop in weekly egg output; the mites were confirmed microscopically from skin scrapings.

Synonyms

• Ornithonyssus sylviarum

Related Terms

• red mite
• Dermanyssus gallinae
• mesostigmatid
• Ectoparasite
• avian mite
• poultry pest

Usage Notes

Distinguished from the red mite (Dermanyssus gallinae) by its permanent parasitic habit on the host; the northern fowl mite does not leave the bird to hide in nest materials. Infestations often cluster around the vent, breast, and wing bases. Control requires direct treatment of birds rather than environmental management alone.