Ash Flower Gall: No Harm, No foul!

A teeny tiny little mite is responsible for those unsightly brown masses left behind over the winter on your ash tree!

​These are ash flower galls. The mites overwinter under the flower buds, then begin feeding in the spring. The feeding then stimulates plant growth under the flower, thereby creating a gall. The gall hardens and turns brown later in the season, then hangs on for the winter. 

Don't worry - the galls are purely an aesthetic issue and your tree won't be harmed. No need to control these mites!