This is the work Contarinia racemi, a midge that forces these swellings on black cherry racemes. You really have to immerse yourself in the foliage this time of year.
There are a lot of these out there. So far I’ve found some 9 species of gall mites; 20 species of gall midges, and 33 species of gall wasps in Brooklyn, almost all in Green-Wood Cemetery.
Backyard and Beyond 
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