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

For example, jumping oak galls are caused by wasp eggs laid in the leaves of such trees as white oaks, bur oaks and swamp white oaks. The galls are little bumps, like beads.

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

Oak galls are popping up everywhere this fall! They're the tiny, fuzzy yellow or brown balls on oak leaves and branches. You could spot one or two, then dozens around the same tree.

The two-horned oak gall wasp is just one of dozens of species of gall wasps that incubate their eggs in oak leaves.

Oak galls, those small fuzzy yellow or brown balls on oak leaves and branches, may signify the health of your tree, Texas A&M AgriLife says.

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.

The range also extends into southern Canada. Lumber from the white oak group, which includes bur oak, is among the heaviest next to hickory, weighing in at 45 pounds per cubic foot. It is very ...

A massive bur oak in Lexington that had lived through hundreds of years of storms, droughts and human development finally succumbed to Friday’s powerful winds.

The Bur Oak, a landmark at the Lincoln Park Zoo, was about 300 years old. Before it was chopped down, people lined up to say goodbye. Cuttings from the tree are being nurtured into saplings.