If you’ve noticed unusual bumps that look like tiny “horns” or brown spots on the leaves of your oak tree this winter, you’re not imagining it. Many residents in the region are seeing a higher ...

This small invasive beetle has infested dozens of Ventura County oak trees. Here's what to know.

‘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 ...

Welcome to our tree column, “Ask your local arborist.” Each month, arborists from the Davey Tree Expert Company in Menlo Park discuss a tree-related topic from general care and planting tips to how ...

The invasive Goldspotted Oak Borer beetles are responsible for killing at least 200,000 oak trees in SoCal, increasing fire ...

The Mediterranean oak borer, a miniscule beetle no bigger than a sesame seed, has been discovered in trees around the Portland area. The invasive pest native to Europe, the Middle East and North ...