The Unusual Oak Felt Scale
![Photo of oak felt scale on pin oak](https://www.arbordoctor.com/media/site/blog/1 Oak Felt Scale Ovisacs Roth Moyer Elem School Ft Thomas 3.jpg)
My friend Ron Rothhaas (Arbor Doctor, LLC, Cincinnati, OH) texted a series of images last week showing a pin oak (Quercus palustris) festooned with small, white structures superficially resembling insect cocoons. However, a closer look revealed the structures to be “ovisacs” of the Oak Felt Scale (OFS), Acanthococcus quercus (formerly Eriococcus quercus), family Eriococcidae.
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