Even if you’re experiencing cold temperatures or even have snow on the ground, it’s not too early to be thinking about how to minimize the yellowjacket, wasp, and hornet populations that often plague our picnics and cookouts by the end of the summer.
Many people are confused with how to tell the difference between bees, wasps, and yellowjackets. Here’s how to tell them apart:
Bees, such as the bumble bee or honey bee that are so important to the pollination of our crops, usually have a chunkier appearance and appear to be fuzzy. They won’t join you at the picnic table because they are more focused on pollen and nectar.
Wasps are sleek and skinny in appearance, with the paper wasp being distinguishable with its hind longs hanging behind them during flight.
Yellowjackets have the classic black and yellow pattern on a shiny body, and can range from ¾ of an inch to just over an inch in length.
Bald-faced hornets look particularly menacing with a black body and white head making them fairly easy to spot even from a distance.
Although there’s nothing like having a picnic ruined by constant visitation from yellowjackets, or even worse being stung by one, the first step in preparing for them is to know the specific types and the lifecycles of the most common species.
Yellowjackets are the primary bad characters in many parts of the country, and are blamed for the most aggressive behavior. Even so, not all yellowjackets are alike. The aerial yellowjacket (Dolichovespula arenaria) creates paper nests in trees and shrubs, and is primarily a predator feeding on caterpillars and insects around the yard and garden. Its cousin, the western yellowjacket (Vespula pensylvanica), is typically the uninvited guest to picnics and outdoor gatherings as it’s a scavenger that clues into sweet items. The western yellowjackets are also the ones that nest in the ground or in crevices of the home or structures, and can surprise people when they mow or work around a nest potentially filled with thousands of stinging residents.
Bald-faced hornets (Dolichovespula maculate), which are a type of yellowjacket, also build their large papery nests in trees and shrubs, and are predators like the aerial yellowjacket. They can aggressively protect their nests, but don’t otherwise pose a nuisance at the table.
Identifying The Nests
Paper wasps build their smallish, open papery nest underneath eaves, and unfortunately, sometimes below grills or other frequented areas. While not typically aggressive, they will protect their nest.
Most of these species rely on a single, mated queen to produce the workers and following year’s queen, except for the paper wasps who might start out with several queens in a nest that are ultimately whittled down to a dominant one.
By the end of last season, the mated queen of any of these species found a protected place to spend the winter, and will come out as the temperature warms in the spring. This is when homeowners need to start paying attention.
“When the queens emerge, they are looking for a nice, quiet place to build their nest,” said Jeff Hahn, Extension entomologist for the University of Minnesota.
The good news is even if you had a nest in the wood pile, or found a large paper nest tucked in your lilac bush, they won’t reuse them. All of the entomologists with whom I’ve spoken indicate that no wasp or yellowjacket species reuse their nests. But, to be extra cautious, you may want to check with your local Agricultural Extension agent, just to be sure, before removing any nests for closer inspection.
But these means you need to start looking at your home and property to see where they might end up instead.
“Look for the nests right away in the spring and early summer,” said Hahn. Regularly inspect the eaves of the house or outbuildings, and pay particular attention to rodent burrows or cracks and crevices on the outside of the home where yellowjackets may create their home. Remove small nests, and fill or cave in holes in the ground. Even openings between concrete blocks can be advantageous to the ground dwelling species. Seal them before they set up residence. The one situation you want to desperately avoid is allowing yellowjackets access to the inside of your home.
Traps baited with pheromones are a popular option for many homeowners as a way to capture the mated queens before they’re able to start laying eggs for the season. Hahn is dubious of the effectiveness of this method since it’s practically impossible to catch all of the queens in a neighborhood. Just because you catch a few from your property, doesn’t mean there aren’t hundreds across the fence line.“There’s not a magic solution,” said Hahn. “People just need to be aware.”
And once summer and the higher wasp and yellowjacket populations arrive, you probably can’t significantly reduce the population, but you can learn to live with it.
Traps, whether baited by a chemical attractant or by a homemade sweet smelling concoction, work the best on the yellowjacket scavengers. While they don’t make a huge dent in the population, people can place them in areas to draw them away from the major human activity. If you do use traps, keep them along the perimeter of the yard. Don’t have them close to where people eat and socialize since, in essence, by doing so you’re bringing the yellowjackets to the party.
More good news: beneficial bees are not attracted to the same bait — whether it’s a pheromone or a food bait — they’re looking for nectar, so there is never a problem with trapping good bees.
Hahn recommends keeping any food at picnics covered until you sit down to eat, and even then, be very cautious as yellowjackets can be in the most inopportune places. Be particularly careful with beverages. Keep them covered when you’re not actively drinking, or at least check the inside of the can or bottle thoroughly before taking a big gulp. Many picnics have been ruined with swollen lips or painful tongues.
Speaking of stings, Hahn said yellowjackets and wasps do not bite. They sting. They are different than honey bees, who can only sting once and then die, as they have barbless stingers that do not tear out of their body. You might receive a brief nick, but it is a painful sting nonetheless.
As the weather warms, look at your yard and home with the eye of a queen searching for the perfect place to raise her brood, and do your best to minimize her options. While we never know how abundant the population might be each season, you can reduce the numbers directly around your home.