Coast live oak leaves with brown, scorched margins due to feeding on the leaf underside by the two-horned oak gall wasp. (Photo by Jack Kelly Clark) These wasps are native to California, and form ...

You might unknowingly be doing one thing that could easily lead to dead, brown leaves. By Laura McKenna 11:59, Wed, Feb 5, 2025 | UPDATED: 11:59, Wed, Feb 5, 2025 ...

Q: Most years, my hawthorn tree gets lots of brown patches on the leaves. It always seems to grow normally, though, so I wonder if this is a disease I need to worry about?