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Wasps prey on the lavae of other insects we find a pest, like mosquitoes, moths, flies etc, so they keep these populations under control. Also, many species do pollinate, and some carry and cultivate yeast.
http://insects.about.com/od/antsbeeswasps/f/What-Good-Are-Wasps.htm
William.
Mr_Sworld
Bad_Science
Just saying...