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Alphabetical List of Critters - Hornets, Wasps and Yellowjackets

Hornets, Wasps and Yellowjackets

Many of Maine’s hornets, wasps and yellowjackets are members of the Vespidae family of insects. They are social insects capable of repeatedly stinging if they feel threatened or feel their nest is in danger. They can be a significant nuisance throughout Maine, particularly in mid to late summer when colonies reach peak numbers. The colony (nest) is started each spring by a single fertilized queen and continues to grow through summer as more workers hatch.  Hornets, wasps and yellowjackets may be aerial or ground nest builders, producing grayish paper nests in trees, shrubs, and under building eaves. They may also nest in the ground, in logs, or in the walls of structures. They prey on caterpillars and other insects, though yellowjackets will also scavenge and are often attracted to sugary and high-protein foods in garbage containers.

Yellowjackets are small, yellow and black wasps, approximately 1/2-3/4 of an inch in length. They tend to be more aggressive than other wasps and will defend their colony vigorously.

European hornets (University of Kentucky) (see photo above)

Bald-faced hornets have black and white patterns and range from 5/8-3/4 of an inch in length. They, too, are aggressive and may attack with little provocation.

Paper wasps are typically long-legged with spindle-shaped abdomens and tend to be less aggressive than yellowjackets and bald-faced hornets.

Management:
To reduce the risk of encountering yellowjackets and other stinging wasps, remove waste frequently and maintain tight lids on trash cans. If yellowjackets are present, avoid using perfumes and wearing bright colors, and keep food and drinks covered. Commercial traps can be effective for yellowjackets but are typically not attractive to bald-faced hornets or to paper wasps.  Hornet, wasp and yellowjacket nests should not be disturbed unless they pose a risk. Nuisance nests are most easily removed in early spring before the colony has had a chance to grow. Larger, well-established nests may pose enough of a risk to warrant treatment. Nests should be treated at night when the wasps are least active. Insecticide treatments should be sprayed directly into the nest entrance, whether it is above or below ground. If the nest is located inside a wall, the entrance should be located and treated but not plugged to ensure that the insecticide is carried into the nest and to avoid insects showing up inside the structure. Stings can be painful and potentially life-threatening to those with allergies. Be sure to wear protective clothing when treating and removing nests.

See also: Controlling Wasps, Hornets and Yellowjackets (University of Kentucky) (En español: El control de avispas, avispones y avispas)


**** IMPORTANT NOTICE **** [en español]
Pesticide registration status is subject to change and varies from state to state; therefore the University of Maine Cooperative Extension cannot assume liability for any recommendations made on non-University of Maine websites that we are linking to. It is the responsibility of the applicator to verify the Maine registration status of any pesticide BEFORE applying it. THE LABEL IS THE LAW! The Maine Board of Pesticides Control (Maine BPC) recommends that you check with your dealer for the Maine registration status of any pesticide, and that you always check and follow your label! You can also call and ask the Maine BPC: (207) 287-2731 or, if you like, visit them online at: www.maine.gov/agriculture/pesticides/

Image Description: side-by-side photos of a Yellowjacket and a European Hornet, for comparative purposes

Image Description: PaperWasps

Image Description: VespidWasp-02-smaller

Image Description: VespidWasp-2009-smaller

Image Description: GoldenPaperWasp-smaller

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Home and Garden IPM from Cooperative Extension
491 College Avenue
Orono, ME 04469-5741
Phone: 207.581.3880 or 1.800.287.0279 (in Maine)E-mail: james.dill@maine.edu
The University of Maine
Orono, Maine 04469
207.581.1865