Our native oak trees face a new threat. In November 2019, scientists in Calistoga discovered tiny symbionts — an insect-fungus team — killing mature valley oak trees (Quercus lobata). It was the first ...

Defying its typical seasonal pattern, my beautiful backyard oak tree — which, at over 300-years-old, predates the neighborhood — recently shed its leaves unexpectedly. Upon a thorough evaluation ...

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 ...