Wasps are a familiar sight in many environments, often drawing attention to their intricate paper nests. These structures, built from chewed wood fibers and saliva, serve as the hub for a colony’s activities throughout warmer months. A frequent question arises regarding these nests once the buzzing activity subsides: do wasps return to them?
Do Wasps Return to Old Nests?
Most social wasps, including common species like yellowjackets, hornets, and paper wasps, do not reuse their old nests. The colony life cycle of these wasps is annual, meaning the entire colony perishes with the onset of cold winter temperatures. Only newly fertilized queens survive the winter, hibernating in sheltered locations away from the nest, such as under tree bark, in leaf litter, or within wall voids.
When spring arrives, these queens emerge to build new nests. Building a new nest each season helps prevent the accumulation of diseases, parasites, and pathogens. While wasps do not reoccupy old nest structures, they might build a new nest in the same general location. This often occurs if the site offers optimal conditions such as protection, warmth, and easy access to food and water sources.
The Fate of Abandoned Nests
Once a wasp colony completes its life cycle, the abandoned nest typically remains until it degrades. These paper-like nests are susceptible to environmental factors. Over time, rain, wind, and freezing temperatures cause them to break down.
An empty nest can also become a temporary shelter for other small creatures. Spiders, small rodents, or other opportunistic pests may take refuge in the sturdy, paper-like construction. Additionally, due to their composition of dried wood fibers, abandoned wasp nests can pose a fire risk if located near flammable materials or ignition sources.
Managing Old Nests and Preventing New Ones
Safely managing old wasp nests begins with confirming they are truly abandoned. This is best done in late autumn or winter after a hard frost, when all wasp activity has ceased. When removing a nest, wear protective clothing, including gloves, long sleeves, and eye protection, even if you believe it is empty.
For nests within reach, a long stick, broom, or scraper can detach them. After removal, place the nest in a sealed bag and dispose of it in a covered trash bin. Cleaning the area with soap and water helps remove residual pheromones that might attract new wasps. For large or difficult-to-reach nests, or if unsure about activity, contact a pest control professional.
To prevent wasps from building new nests, focus on making your property less appealing. Seal cracks, gaps, or holes in your home’s exterior (siding, eaves, foundations), as these are common nesting points. Regular landscaping maintenance, such as trimming overgrown vegetation and removing dead branches, eliminates potential nesting sites.
Removing food sources is effective: keep trash cans covered, clean up outdoor food spills promptly, and remove ripe or fallen fruit. Some plants like mint, eucalyptus, and citronella can deter wasps and be planted around your home. Hanging decoy nests, such as an inflated brown paper bag, can trick territorial wasps into thinking an area is occupied, discouraging new nest construction.