Those weird balls on your oak tree are from gall wasps
Oak Gall Wasp | From the Ground Up - YouTube
Galls on Oak Leaves and Twigs | Horticulture and Home Pest News
Growths on Oak Leaves and Twigs :: Melinda Myers
What is growing on that oak tree?
How to Get Rid of Oak Galls
What are these ugly bumps on my tree's leaves? - MSU Extension
Oak tree 'galls' are fairly harmless
Brown balls on oak trees aren't harmful | San Luis Obispo Tribune
How Wasps Make Beautiful and Complex “Oak Apples” | Brandywine Conservancy and Museum of Art
Mystery Balls | Garden Housecalls
What Is Wrong With My Tree? Gouty Oak Gall
What Are Oak Galls - Learn About Oak Apple Gall Treatment
Oak Galls and Mistletoe: Nature's Decorations - The Real Dirt Blog - ANR Blogs
The English Oak – Dover District Council
Oak Galls and Mistletoe: Nature's Decorations - The Real Dirt Blog - ANR Blogs
What Are Oak Tree Galls?
Fuzzy Orange Galls from Parasitic Wasps on Oak Leaves – Observations from 2013-2020 – Naturalis Historia
What's wrong with my plant? : Garden : University of Minnesota Extension
What Are the Balls on Oak Trees? - ProGardenTips
Oak Diseases & Insect Pests | Home & Garden Information Center
What's wrong with the acorns? | Nature Watch
