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Live Oak Leaf Galls


Galls are formed when an insect (in this case a type of tiny wasp) lays an egg just under the surface of a stem or leaf. A gall is formed because the tree is stimulated by the presence of the egg, and eventually the hatched larvae, to grow a structure around the wounded area. Galls are very common in oaks and are not considered harmeful to the health of trees.


Oak tree leaves

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Austin, Texas, USA

Spotted on Sep 28, 2015
Submitted on Oct 1, 2015

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