What are these blister-like things on the leaves of my oak tree? Will it harm them? P.T., Tulsa The structure on your leaves is a common oak leaf gall and will not harm a mature tree. Galls are ...

Dear Neil: I found these many small lumps on the backs of my oak leaves. I've read they are insect galls caused by wasps laying eggs, and that they may cause these leaves to fall early. Will there be ...

It can be unnerving to find that the leaves of an oak or hackberry tree are as bumpy as a rock-covered seashore in late summer. Other trees’ leaves may break out in acne-like red spots or sport ...

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 common ...

A gall is an abnormal growth or swelling of a plant caused by hormones released from insects, mites, bacteria, or nematodes. They can appear on any part of the plant with vast variation in morphology, ...

Q: My red oak is about 10 years old. Some of the leaves are starting to look distressed, so I looked closely. I noticed small red ants climbing up and down the trunk, almost as if they are harvesting ...

While walking around our property this week, I came across two interesting things going on with our pin oak trees. The first thing that caught my eye was what looked like a white grape growing from an ...

Persisting in the winter months as ball-shaped shells on oak trees, galls, which are considered an eyesore by landscapers in the summer months, appear as a sort of curiosity in winter. What are these ...

While walking to the mailbox one sunny morning I saw odd-looking spheres hanging from one of the young white oaks. About the size of golf balls, they were white with a few brown spots and fuzzy.

The National Garden Bureau recognizes and thanks the experts at PanAmerican Seed, an NGB member, as the author and contributor to this fact sheet, which is provided as an educational service with no ...