tiny bumps on new growth of shrub sumac, planted along a walk way, that appears to be killing the pl

Asked September 27, 2019, 12:08 PM EDT

How and why is sumac, formerly robust, dying from tiny bumps in the new growth leaves. What can be done about this, will the sumac revive in the spring and are there ways to keep it from spreading. This hedge is planted along an entrance to an old church, the hedge about five years old, and borders a native prairie landscape on both sides. It is our desire to not use toxic chemicals if possible.

Minnesota galls leaf galls

2 Responses

Please send a picture of the bumps on the leaves.

The bumps on your sumac may be galls caused by eriophyid mites. Mites are not insects; they are arachnids. Eriophyid mites are microscopic mites that have only two pairs of legs. They are slow moving, usually white or yellow in color, and have a distinctive "carrot" shape. They are very host specific. The species of mite found on your sumac plant species will not usually feed on other plant species. Most eriophyid mites make their home on the surface of leaves where their feeding and can cause bronzing or galls on leaves. The damage is usually only cosmetic. Little damage is done to the health of the plant. They are difficult to treat. https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls




It may be a gall.