Growth on leaf

Asked May 23, 2018, 7:21 AM EDT

What is the growth on the leaf and what’s he tree, elm? Thanks

Montgomery County Maryland elm leaf gall tree

1 Response

This looks like an elm tree. This is a gall called the Elm Sack Gall. This is caused by an aphid. This is cosmetic damage only and no control is necessary. Here is our website on galls and there are many types. http://extension.umd.edu/hgic/shade-tree-galls

mh