Eriophyoid
Guides
Aceria brachytarsus
pouch gall mite, walnut purse gall mite
Aceria brachytarsus is an eriophyoid mite species that induces leaf-pouch galls on walnut trees (Juglans spp.). Formerly classified as Eriophyes brachytarsus, this microscopic arachnid is known for producing distinctive bladder-like galls on foliage. The species has been documented in California, Iran, Spain, and Belgium.