Mediterranean oak borers were first identified in the city of Sacramento last July. They target oaks native to Sacramento, those trees with arching canopies that line the American and Sacramento ...

When most people think of scientists discovering a new species, they think of long treks and exotic jungles, not a suburban ...

A new pest may emerge in Ohio as Brood XIV cicadas conclude their 17-year life cycle. Oak leaf itch mites can bite people, ...

Galls can be on leaves, twigs, roots, or flowers and can take on various appearances. One of the more attractive galls you may encounter is wool sower galls.

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

The gall becomes a shelter for the wasp eggs, providing safety and nourishment to the larvae without harming the tree. You can identify where the adult wasps exit the gall by the small holes on the ...

Oak blister gall and oak-apple gall are common on oak leaves. However, oaks can also develop stem galls, such as oak bullet gall, which in high numbers may reduce plant growth.

Adult gall wasps will inject a chemical into the leaf buds as they're forming, and these little green balls form in that spot, providing us with these funky-looking mini-apples.

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

Woody oak galls are extremely common and not especially harmful to trees, but they are unsightly. They’re the work of female wasp-like insects that sting the small twigs and lay eggs in the ...

The upper surface of affected leaves tends to be of normal green color near the base with inner portions abruptly changing to yellow and light brown outward toward the leaf edges.

A Rice University student covered high-heeled shoes with galls for her sculpture to showcase the combination of science and art.