On Sep 27, 2010, vossner from Richmond, TX (Zone 9a) wrote:
Main predator for immature black and brown widow spiders. They use the spiders to build their nests. I think these are also called potter wasps b/c of the sophisticated nests they build, which looks tubular like urns. I find the nests annoying when they're on my brick walls but they're easy to remove w/ a water hose.
Wasp itself is rarely aggressive.