Aerial yellowjackets, make their paper nests in branches of trees, bushes, house eaves, or other places in the open air. They are considered beneficial because they only feed on insects. They can help control flies and other harmful insects like caterpillars and aphids. They can sometimes be confused with paper wasps, which are a less annoying species.
One of the most common wasps in North America. Nest construction begins in March with most colonies dying out by July. Nests are usually above ground ranging from a few inches up to the tops of trees. Colonies can also be found in or on man-made structures such as sheds, houses, garages, etc. The number of workers in an active colony at any one time can be as high as 700. Adults tend to be less aggressive than most other species of yellow jackets, although when aroused they have been known to spray venom out of the sting.
Adult Activity Period: March – July
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Website Accessibility Policy
Napa County Mosquito Abatement District is fully committed to providing accessible facilities, elements and
channels of communication to all members of the public. As part of this commitment, Napa County Mosquito Abatement District
has a policy of providing an accessible website compatible with the Web Content Accessibility Guidelines (WCAG 2.1) and
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other impairments to understand and use the website to the same degree as someone without disabilities. We welcome
feedback and can often resolve issues in a timely manner if they arise.
If you need any special assistance or accommodations:
Napa County Mosquito Abatement District has designated a compliance officer for website disability-related accommodations.
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In addition to testing with users with a wide range of disabilities and coding our website to WCAG standards,
Napa County Mosquito Abatement District regularly scans its website to ensure ongoing compliance, and makes timely
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