Nuisance Bees & Wasps
Wasps and bees occasionally cause concern for homeowners. In general, they are part of both urban and rural ecosystems and should be managed when they presentdifficulties, not because they are present.
Bees are beneficial pollinators and control for them is discouraged. Honeybees and bumblebees work blooming flowers and may cross paths withpeople. Typicallybees are not aggressive unless an unwary gardener grasps them.
Yellow jackets are a yellow and black striped, ground-dwelling wasp that are very aggressive in the late summer and fall. They are scavengers and will eat caterpillars and many types of sugars and meats at picnics. Frequent rains can disrupt nest building of these ground dwelling wasps reducing their numbers.
The Polistes or European paper wasp also has yellow and black stripes and is often confused with yellow jackets. This wasp is a predator that builds paper nests in the eaves of buildings and in small cavities. Their habit of nesting around homes leads to stings on unwary people. However, the Polistes wasp is not a problem for outdoor dining because it hunts for live prey. This wasp will not be attracted to traps.
Hunting wasps, such as mud daubers, cause concern when they blunder into homes looking for prey. Several species occur in Colorado, but in general they are harmless to humans.
If wasp nests are judged to be too close to the house or children's play area, use permethrin or other pyrethrin insecticides to kill the insects still living in the nest. For more information, see fact sheet 5.525 Nuisance Wasps and Bees.
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Updated Monday, February 17, 2014