Rhus Trilobata (Skunkbush Sumac) Galls
The sumac in my yard is infested with galls (see photos). Any idea what pest is causing this?
I have a lot of fruit trees and a viburnum nearby. Are any of those likely to also be susceptible to this pest?
I wouldn't miss the sumac, but there is a lot of it to remove.
Boulder County Colorado trees and shrubs
Ihttp://extension.colostate.edu/topic-areas/insects/insect-and-mite-galls-5-577/ Eriophyid mite. I am sending you a fact sheet on them. I hope it is helpful. Best of luck.
Thanks! Would you recommend removing the affected foliage to reduce spread of the mite to other plants and trees?