Insects, Pests, Diseases & Weeds
Eriophyid mite species cause a variety of pouch galls on red, sugar and silver maples. Pouch gall formation, a localized growth reaction of the infested plant, occurs as a result of mite feeding activity. The species of mite can be identified by the specific characteristics of the gall on the host plant.
"SP290-F Maple Leaf Pouch Galls," The University of Tennessee Agricultural Extension Service, 04-0164 SP290F 150 12/03(Rev) E12-4615-00-008-04, http://trace.tennessee.edu/utk_agexfores/27