Sumac Leaf Galls: Aphid-Created Structures on Volunteer Shrubs

Identifying the Plant and Its Galls

That volunteer shrub with strange "fruit" is sumac (Rhus species), and the balloon-like structures are leaf galls formed by aphids—identical to those described in the previous article but on a different host presentation.

Natural History

Sumac gall aphids induce the plant to create protective chambers on leaf tissue. Inside, multiple aphid generations develop safely from predators. The galls start green, often coloring yellow and red as they mature, creating striking ornamental interest.

Expert Confirmation

Naturalist Shannon Pable notes the galls' "amazing" appearance. While they may look alarming, they represent a specialized insect-plant relationship that doesn't threaten the sumac's survival.