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 ...

Over the past few years, we've seen quite an increase in the number of oak trees affected by oak gall. These galls are roundish, very hard growths that surround the twig of several types of oaks ...

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 ...

Hundreds of species of small wasps called gall wasps live in the forests of North America. Hundreds more species of them are spread worldwide. In Southeast Missouri oak trees are a favorite host plant ...

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.