Galls are structures made up of plant tissue, forming in response to the saliva of mites or small insects as they feed. The number and variety of galls found on trees in our landscapes are closely ...

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 ...

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 ...

Question. My oak tree has woody growths on the limbs. Should I be concerned? Answer. You have spotted the handy work of quite small insects or mites. Oaks, especially the live oaks, seem to be ...

Q : The attached photo is of a 32-inch red mulberry grown from a 6-inch bare-root seedling last spring. I am now going to plant it onto a preserve where it will get scant support over summer. I am ...

Dear Neil: What are the pimple-like growths on the leaves of my hackberry tree? Are they harmful? Those are insect galls that result when the female insect stings the leaves of the tree and lays her ...

‘I have some weird, seemingly hollow, green, round balls falling from my oak tree. What in the world are these things?” — S.Y. You are describing an interesting growth that can occur on a variety of ...

Q • I have an oak tree out front that dropped leaves in a recent storm. I picked up a leaf and noticed "nodules" all over the leaf. Can you tell me if my tree has a problem or if this is normal?

The adult female spruce adelgid is barely visible beneath her camouflage of white waxy threads, beside her eggs. Click here for larger image. Photo by Jeff Mitton. Tiny tangles of white fluff appeared ...

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 ...