Oak Leaf Galls

Oak Leaf Galls

Oak Leaf Galls

We have a variety of galls growing on oak leaves. This leaf with its galls, is typical. According to a University of Minnesota “gall” web page, these are created by Cynipid wasps. This page has a nice set of photos and descriptions of different kinds of galls. The University of Michigan reminds us that “While galls may appear threatening, based upon their appearance, most galls actually pose very little threat to overall tree late to try and chemically control it. Pesticide sprays would have had to have been applied earlier in the growing season prior to gall formation. And since many galls form on the leaves of deciduous plants, these leaves will fall off in autumn – giving tree leaves a “clean slate” to start off in the next growing season.”

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