Subject: Is this an insect sac?
Geographic location of the bug: Southeast MO
Time: 08:10 PM EDT
Found Oct 7, 2017 bear Lampe, MO.
How you want your letter signed: PJ
This is a Oak Gall, probably caused by a Gall Wasp in the family Cynipidae. According to Henderson State University: “Galls are abnormal, vegetative growths that are usually formed as a response by plants to the action of fungus, mites, or insects such as wasps, aphids, and true bugs. Galls can be formed in the leaves, petioles (stem) of leaves, twigs, buds, or on the roots.” More information on Galls can be found on Arborilogical. Your Gall looks similar, but distinctly different than the Eastern Speckled Oak Gall pictured on ISA Texas.