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 ...

‘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 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 ...

It’s less than a half-inch long but it can fell a giant oak tree in no time. The goldspotted oak borer, GSOB or Agrilus auroguttatus, is a 0.4-inch bullet-shaped beetle with six golden spots on its ...

A drive to the mountains in San Diego County means you're surrounded by nature, trees especially, which have been facing a major threat from something so small you might not even notice it. You will ...