The two-horned oak gall wasp is just one of dozens of species of gall wasps that incubate their eggs in oak leaves. Skip to content. All Sections. Subscribe Now. 70°F. Sunday, June 8th 2025 ...

Learn about the wasps that have a gruesome but fascinating way of surviving.

Q • My oak trees have more large galls than I’ve ever seen on them, and I’m worried about their health. What can I do about ...

Hugo’s father, Andrew Deans, a professor of entomology at Penn State, identified the objects as oak galls – abnormal plant ...

There are over 200 insects that cause oak galls including midges, mites, aphids, flies, and wasps. The undisputed champs of oak galls are a big family of little wasps called Cynipids.

Galls are abnormal growths and can be caused by a variety of different organisms, including insects and mites, and occasionally nematodes, fungi, and bacteria.

They are called galls. Oak galls are caused by gall wasps, a small cynipid wasp. The female wasp lays her eggs on the tree. This irritation causes the abnormal plant growth we ...

Of all the trees in your yard, the oak is practically a small habitat all by itself. So many creatures of all varieties depend on the mighty oak to provide it shelter, or food, or sometimes even both.

In fact, the tannin levels are so high in oak galls that when crushed and soaked in water, ... “The molecular mechanism by which cynipid wasps induce galls remains a mystery,” said Guiguet.

Galls are odd growths found on plants. Sometimes they are papery brown orbs on oak leaves, swollen balls on goldenrod stems, bulging kidney-shaped bumps on blueberry branches, or white woolly ...