Coast live oak leaves with brown, scorched margins due to feeding on the leaf underside by the two-horned oak gall wasp. (Photo by Jack Kelly Clark) These wasps are native to California, and form ...

Hedgehog galls appear on oak leaves as clumps of bristly pink fur, while wood sower galls look like white or creamy cotton balls. The fluff is actually a group of wasp-induced galls.

While commonly-observed oak galls are spherical and woody, some oak leaf galls are horn-shaped, star-shaped, or form tiny jumping galls. In the wintertime in Butte County, ...

A: It sounds like you have jumping oak galls. These are tiny, seed-like galls that form on the undersides of valley oak leaves. They are caused by the tiny gall wasp, Neuropterus saltatorius.

Some cause growths at the edges of the leaves, and others cause these larger growths called oak apple galls. There are three groups of insects that can cause galls: aphids, gall midges and gall wasps.

Oak galls may form on the branches or the leaves. Maples commonly have galls form on the leaves of the trees from aphids and mites as well as on the bark. Ash trees will potentially form galls on the ...

Leaf galls are essentially harmless to the tree, causing primarily aesthetic damage that does not hurt the long-term health of the tree. Skip to main content Skip to main content. Register ...

Galls are growths on leaves, stems, branches, trunks, and roots caused by various agents. But they are usually induced by either insects or a fungus of some sort. The exact manner in which insect ...

Each year in late spring and early summer, homeowners begin noticing strange growths on the leaves or stems and are concerned for the health of their trees. Several different types of galls are ...

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 ...

A new pest may emerge in Ohio as Brood XIV cicadas conclude their 17-year life cycle. Oak leaf itch mites can bite people, and cause an itchy, rash-like reaction. They also feed on cicada eggs. Oak ...

Don’t jump to the conclusion that those mysterious marks are evidence of disease. They may be leaf mines or galls — and that’s a good thing. 13 Photos View Slide Show › By Margaret Roach ...