Suction-Cups on the Bottom of Oak Leaves
I'm always amazed at how the population densities of certain gall-making wasps on oak seem to synchronize over wide geographical areas so that large numbers of the same gall appears over a wide region. I don't know how they do it. These are very tiny insects and they have an intimate relationship with their host trees; it's best for them not to stray too far.
Oak button galls on white oak are very common this season throughout southwest Ohio; I even spotted some on oaks in central Indiana. The galls are produced by the gall wasp, Neuroterus umbilicatus (...
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