Wildflowers Found in Oregon

Wild Cherry Pouch Gall

Wild cherry pouch gall occurs primarily on wild black cherry, so is primarily noticed on trees at the edge of forests. The galls turn from green to red and appear as slender pouches up to one-eighth inch long on the leaf upperside. There are a number of eriophyid mite species that cause galls on trees at this time of year. Generally, these mites spend the winter under bud scales, then leaving the buds to attack expanding leaves. They typically feed on the leaf underside, eventually being enclosed inside the growing leaf tissue. Galls that are produced as a result of this feeding generally form on the leaf upperside even though the attack was on the underside. However, all of these galls cause little damage to the trees. Considering the cost of control makes treatment generally unnecessary.