In this Palo Alto Online article, George Reno from Davey's Menlo Park office talks about the two-horned gall wasp affecting oak trees and what to watch for this spring.
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 population of tiny gall wasps, most notably the two-horned gall wasp (Dryocosmus dubiosus), affecting their oak trees.
These insects are tiny, unassuming wasps that lay eggs in oak catkins (the tree’s flowers) and along the veins of leaves. When a female wasp deposits an egg on a leaf vein, the tree reacts by forming a gall: a small, plant-made structure that looks like a bump or blob on the leaf. The characteristic “two horns” give this species its common name.
To continue reading George's advice, click here.
For more information, contact the Menlo Park office.
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