Stinging Insects
Hexapoda Hymenoptera
Appearance: Yellow Jackets - Banded
yellow and black, and are commonly mistaken for honey bees,
but they lack the hairy body and are more intensely colored.
Yellow Jackets typically nest underground using existing
hollows. Occasionally nests can be found in dark, enclosed areas
of a building, such as crawl spaces or wall voids. Nests are
enclosed in a paper envelope or ball, but they are not exposed
or observable unless excavated. The nest entrance is small and
inconspicuous.

The western yellow jacket is, by far, the most important
stinging insect in Colorado. Late in the season, when colonies
may include up to 200 individuals, they become serious nuisance
pests around outdoor sources of food or garbage. The western
yellow jacket is estimated to cause at least 90 percent of the
"bee stings" in the state. Colonies are readily defended and
yellow jackets will sting when the nest area is disturbed,
sometimes when just walking by.
Appearance: Hornets - Produce large,
some-what conspicuous grayish paper nests in trees, shrubs and
under building eaves. The most common species is the
Bald-faced hornet which is stout-bodied and marked with dark
and white striping. Hornets feed their young live insects
and do not share the scavenging habit of yellow jackets. Nests
often attract attention because of their large size, but hornets
rarely sting unless the colony is seriously disturbed.
Appearance: Paper wasps - Make paper, open cell
nests which are not covered by a papery envelope. Often these
nests are produced under building overhangs. However, a new
species to Colorado, the European paper wasp (Polistes
dominulus), will also nest in small cavities such as poles and
children's play equipment. Paper wasps are more
slender-bodied than other social wasps. Most social wasps
are reddish-brown and marked with yellow, but the European
paper wasp is marked with shiny black and yellow, allowing
it to be easily mistaken for a yellow jacket
Concerns: Health risks associated with stinging
insects are usually minimal, except in the case of sensitive
individuals who are allergic. If you are allergic, and get
stung, please seek medical attention. EpiPens are commonly
carried by persons with severe allergies and a risk of
anaphylactic shock because they can be self-administered and are
very fast-acting. In the U.S., Canada and the UK, EpiPens are
regulated medical devices and require a prescription.
Control: Yellow Jackets and wasps can be
treated if a nest exists. It could be an exposed nest (grey
paper) or the insects may be entering through a hole in the
exterior of the structure. If possible, do not seal the area
until the nest is dead/eliminated as the insects may try to find
a way out, sometimes via the inside your home.
**Honey Bees** build upon their nests year after year and
can be more difficult to shut down the colony. The nest is a
honey colored disc of cells attached to a surface, almost always
in a voids area such as eves, and enclosed portions of deck
flooring. Honey bees can swarm in the spring and may stay
in a swarm in an area from a couple to 48 hours before they move
on. If the honey bees are accessible you may be able to
call a beekeeper to remove them, as they are beneficial.
If a beekeeper can't help, an extraction is usually the next
step. The area with the nest is cut open, the hive, honey & bees
are removed, and the area is repaired. While this does not save
the bees, it does limit the number of treated bees that escape,
minimizing nearby hive impacts from treated bees.
*** Follow these general tips to help keep stinging insects at
bay: seal holes, screen vents, caulk gaps especially around
wiring or cable lines. Seal any gaps between foundations,
stoops, or patios. Pack soil into small holes along sidewalks
and driveways. Remove or securely cover with plastic sheeting
all brush heaps, firewood and lumber piles, cinder blocks or
machinery. Seal the gaps and spaces where two railroad ties butt
together, as yellow jackets love to build nests in these areas.
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Stinging Insects are found all along the
Colorado Front Range. To get rid of Stinging Insects contact
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