Galls are abnormal growths on a part of the plant. They can be caused by bacteria, insects, mites and fungi. They can be on any part of a plant and are the overgrowth of plant tissue in response to ...

The relationships that have evolved between plants and animals over many millennia of time spent coexisting are often as interesting as they are vast and varied. From the production of nectar and ...

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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 ...

Insect-induced galls represent a fascinating mode of plant-insect interaction where specialised insects manipulate host plant tissues to form complex structures that provide both shelter and nutrients ...

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: Can you tell me what is growing on my tree leaves? And is this growth causing the leave discoloration I’m seeing? Is my tree in trouble? I’ll drop off a sample. A: The tree Mike described is a pin ...

The pinkish-red spots on your birch’s leaves appear to be erineum patches, which are a type of gall caused by very tiny eriophyid mites feeding on the leaf tissue. You will need a microscope to see ...

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 ...

Only recently discovered, in 2017, soybean gall midge is a significant and fast-spreading new pest to Midwest growers. Significant yield reductions may occur, especially at the field edge where this ...