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| Yellow Oak Leaves - Marin County 2024 |
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| Yellow Oak Leaves on Ground - Marin County 2024 |
Virtually all the oak tree leaves in Marin were turning yellow this winter, due to, I believe, a "Twohorned oak gall wasp—Dryocosmus dubiosus."
Fortunately, according to the linked article, "Gall wasps are naturally killed by a complex of fungi, parasites, predators, and competing insects (primarily moth larvae and other wasps) that live within galls. Although aesthetically undesirable, these oak gall wasps do not seriously threaten tree health. No control is known or recommended."
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