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Oak Apple Gall.  Insects choose a specific plant and lay eggs in plant tissue, causing a lump (gall) to form on the tree/plant (Zim & Cottam 140).  This is an Oak Apple Gall, caused by the Gall Wasp Amphibolips confluenta.  The female wasp lays an egg in the developing leaf bud, and the leaf tissue develops around the egg.  The wasp larva feeds on the tissue as it grows.  “When the insect pupates and leaves, the gall can be used as a rich source of tannin that can also be used as a dyestuff” (Grieve).  The hole in the gall is where the wasp escaped from after it pupated into an adult.

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Photographs by Valerie Lykes

 

Home | Division of Parks and Recreation | Virtual Tours | Union Furnace Nature Preserve

Photographs by Valerie Lykes