The galls you are seeing on your tree are often called "oak apple galls," which is a common name for galls shaped like small apples. Dr. Eileen Buss of the University of Florida entomology ...

Will thousands of oak leaf galls produce a mass invasion of wasps? The red cone galls, also known as Hershey kiss galls, are thick on many oak trees throughout the Bay Area this year, but there ...

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 ...

Adult gall wasps will inject a chemical into the leaf buds as they're forming, and these little green balls form in that spot, providing us with these funky-looking mini-apples.

Tallamy describes oak galls being make from a cynipid gall wasp, but not what we typically think of as a wasp, “cynipids are tiny and cannot sting you and most people would dismiss them incorrectly as ...

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

The oak apple gall wasps’ neighborhood pride is not always shared by the owners of the oak trees they’ve developed. Appearances aside, the galls rarely damage the host tree, even when present ...

When you look up into the bare branches of some oak trees at this time of year, you can see ball-shaped growths hanging there, looking almost like nature’s Christmas ornaments.

Oak apple galls are a commonly found type on oak trees. Hackberries on the South Shore may have witches' broom galls on their branches and both blister galls and nipple galls on their leaves.

Galls on oak leaves are harmless growths caused by specific insects. They have different shapes depending on the insect species causing the gall.

The most well known gall is the oak apple gall, found on leaves of oak species.

A spiny gall can be found attached to witch-hazel stems.. Probably the most obvious and well known type is the “oak apple” gall, which displays small tan balls from 1-2 inches in diameter.