What Causes Foam to Come Out of an Oak Tree?

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By Mark Bingaman, eHow Contributor | updated August 17, 2011

Diseased oak limbs should be pruned away.
The oak tree (Quercus) stands tall as a stately specimen and dominates the landscape of homes and forests. Several forms of bacteria sneak into the tree and combust into a toxic material that forces a bacterial foam discharge. The disease generally does not seriously damage healthy oaks but can cause a decline over several years.
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Wetwood
When foam comes out of an oak tree, the specimen may be suffering from bacterial wetwood, a disease also known as bacterial slime, slime flux or alcohol flux.

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