Why Are There So Many Boxelder Bugs Around My Home?

Boxelder bug crawling on a rocky terrain - Keep Boxelder bugs away from your home with Griffin Pest Solutions

Boxelder bugs congregate near homes to stay warm, seek shelter, and remain close to food. They’re attracted to sunny, heat-reflecting surfaces like windows, concrete, and homes with southern or western exposure. Boxelders also tend to stay close to their food sources: acer trees such as boxelder, maple, and ash trees.

If you feel like you’re seeing boxelders constantly this summer, it’s probably not just you. Boxelder bugs really are more attracted to some homes than others. Unfortunately, the more attracted boxelders are to your home, the more likely you’ll have to deal with them all year. Unless you do something about it! Here’s what you should know about the boxelders attracted to your home, including how to keep them away. 

What are boxelder bugs?

Boxelder bugs, or Boisea trivittata, are a species of true bug native to North America. They’re ½” long with black bodies, dark red eyes, and distinctive red markings on their abdomens and wings. Seeds from trees in the acer genus, including maple, ash, and boxelder trees are boxelder bug’s primary food source.

Boxelder bugs are considered “nuisance pests” because they’re not dangerous and can’t inflict serious damage to the plants they feed on. Boxelder bugs typically annoy or disturb homeowners by congregating near or on homes in large numbers. They may also secrete a foul-smelling, yellowish liquid when frightened or crushed. If they secrete a large amount of this liquid, it could stain nearby surfaces. 

Boxelder seeds on a boxelder tree

Why are boxelder bugs here now?

Starting in mid-spring, boxelder bugs re-emerge from their overwintering sites. Boxelder bugs are very temperature sensitive, and upon awakening, they’re usually lethargic and cold. To order to warm themselves up and regain their energy, boxelders seek out heat-reflective surfaces. During spring, you may see large concentrations of boxelders congregating around sunny places such as windows or porches.

By summer, boxelders are seeking mates and food. To find both, they’ll seek out other boxelders around food sources such as acer trees. When boxelders congregate, they release a pheromone that attracts more boxelders to their location. These boxelders eat, mate, and lay eggs on or near their food sources.

What do boxelder bugs want?

During the summer, boxelder bugs are primarily looking for mates and food. They’ll typically leave their usual sunning places in favor of food sources. During summer, you may find congregations of boxelder bugs clustered around the lower trunks of acer trees. These bugs feed on the seeds falling from the branches and lay eggs on the trunk and leaves.

Boxelders are slightly less common around homes during the summer, but they’re not unheard of. You may continue to see boxelder congregations around your home all summer, especially if there are acer trees nearby. Boxelders also like to sun themselves to warm back up after cloudy weather or rainfall. The more you see boxelders during summer, the more likely they’ll attempt to overwinter near you in fall.

Boxelder bug on a hardwood floor

Why are boxelder bugs around my home?

If you’re seeing boxelders around your home constantly, it’s probably because they’re getting food nearby. Boxelders feed almost exclusively on the seeds of boxelder, maple, and ash trees. Once they find a good food source, they’ll spend all summer feeding off of it and mating nearby. Boxelders lay eggs near food sources, usually on trunks, branches, and leaves.

Boxelder bugs are also naturally attracted to warm, sheltered areas, which may bring them closer to you. Homes with southern or western exposure tend to deal with more boxelders than most, because the sun shines on those homes longer every day. Tall buildings and structures with many large glass windows also tend to attract boxelders. If you find boxelders near your home, you’ll probably see them on garden level windows, porches, decks, or sidewalks.

What can I do about all of these boxelders?

The most effective way to avoid dealing with boxelders is to remove the boxelder tree from your property. You probably don’t want to do that, however, so follow these alternative tips instead. First, don’t crush the boxelders you find. Smashing the bugs will only release the foul-smelling liquid they also release when threatened. This liquid contains pheromones other boxelders find attractive. In other words, killing boxelders will only attract more boxelders to you.

Instead of killing them, vacuum up the boxelders you find and throw out the bag when you’re finished. Wipe down the surfaces where boxelders congregate with soapy water to remove the pheromone they secrete. Mow your lawn frequently to pick up fallen acer seeds as much as possible and deprive the bugs of their food source. To prepare for fall, you should also look for signs of gaps or cracks near areas where the bugs congregate. Patch up any gaps you find with weatherproofing or caulk.

 

If you’ve tried all of this and still have a boxelder bug problem, don’t give up hope! You can always get in touch with Griffin Pest Solutions. Our experts have the tools and know how to remove your boxelder problem this summer… before they move in with you this fall!

Why Do Boxelder Bugs Come Back in Spring?

Boxelder Bug swarm on wood

Starting in early spring, boxelders re-emerge from their overwintering sites to feed and mate. The bugs re-appear so quickly every spring because they often find their overwintering sites around homes and neighborhoods. Adult boxelders begin reproducing immediately after they wake up from winter dormancy, triggering population growth all season long.

Although “boxelder season” is generally considered to be fall, you may find boxelders are equally prevalent in spring. You probably find them a little too prevalent. Unfortunately, if you have boxelders in spring, you’ll probably have them in fall… and next spring. Fortunately, you don’t have to have them in either season! By learning about why boxelders come out in spring, you can learn to keep them away from your home for good. Here’s what you should know about the other boxelder season, and what you can do about it:

boxelder bug

Why They’re Back

Technically, it would be more accurate to say they never left! During the winter, boxelder bugs sneak into the nooks and crannies of homes, where they can stay safe and warm while they hibernate. Unfortunately, boxelders are great at getting into walls, attics, basements, crawl spaces, or floorboards. Once inside, boxelders hunker down in out-of-the-way places and stay there all winter. They’re so quiet and un-intrusive, you may forget they’re there!

Unfortunately, even if you forget about them, the boxelders are still there. In spring, boxelders wake up waiting two things: food and… uh… companionship. Boxelders mate in early spring, so their offspring will be ready to survive when next winter rolls around. Thing is, boxelder bugs have to get busy to… get busy, which means they come out in force looking for places to eat and court mates. Honestly, their spring behavior isn’t all that different from ours.

Boxelder bugs entering home through a gap

Where They’re Coming From

(Cue the horror movie music) The bugs are coming from inside the house! Any adult boxelder bugs you see this spring hibernated through the winter. Unfortunately, if you see some boxelders hanging around your place, it’s probably because they spent all winter squatting. Don’t feel bad about it–it’s more common than you’d think.

Boxelder bugs exploit even the tiniest breaches in a home’s defenses. They’ll crawl through floor cracks, squeeze through insulation, or creep under gaps in a window frame. Look in dark, warm, humid, hidden spaces. You might find them under boxes, in walls or insulation, near corners, or on window frames. 

Boxelder tree seeds

What They’re Looking For

Like we said above, when boxelders wake up they’re looking for food and mates. They’re interested in food first (priorities). Boxelder bugs got their name from their affinity for boxelder trees and other trees in the acer family, but they’re not picky. They’ll will eat just about anything, especially in early spring when they’re at their hungriest. They cling to trees, leaves, developing seedlings, or low vegetation.

After mating, boxelders want to find a place to lay eggs. The best places to lay eggs are places where the newly hatched offspring will have a plentiful food source readily available. Acer trees like boxelder, ash, and maple trees satisfy every one of the boxelder home requirements, which is why they’re so particularly appealing to the lazy little bugs.

A stack of window screens

How We Can Stop Them

It’s tough to stop boxelder bugs in spring, after they’ve already infested your home or surroundings. There are a few ways you could make your yard or building less attractive to them, however. First, perform regular lawn maintenance. Mow your lawn, trim your hedges, make sure branches or leaves don’t touch the home. If you have an acer tree, clear seed droppings regularly. If your problem is really bad, you may consider having the tree removed.

Inside, you could vacuum, sweep, and clean boxelder bug-prone spaces frequently. Vacuum the bugs up directly when you encounter them. Boxelders don’t hatch eggs inside homes, so you don’t have to worry about that. Look for places where they might be getting free food and moisture. Seal up cracks in the floor, insulation, or foundation. Consider replacing window screens annually.

 

Boxelder bugs are annoying and a little distressing, but they’re not dangerous. The best way to keep them away in spring is to keep them away in fall, too. Look for ways they get in and take away the things they want, and you’ll find it’s completely possible to significantly cut down or even eliminate the boxelder presence around your home.

Finally, just remember: if you’ve tried everything and you still can’t seem to deter your red-and-black nemesis, give us a call. We’ve got plenty of experience skirmishing with the vengeful “bug from beneath the basement”, and we’re happy to play your sidekick. Have a happy spring!