A genus of itch mites (family Cheyletidae) parasitic in cattle, sheep, and goats. Psorergates bos is the itch mite of cattle, described in New Mexico; Psorergates ovis is the small itch mite of sheep in the U.S., Australia, New Zealand, and South Africa.
[G. psora, itch]
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Examples: glitazone, GI cocktail, etc.