Boxelder bugs, also spelled box elder, (Boisea trivittata) belong to the true bug family Rhopalidae. They are a harmless nuisance pest, and arrive in both the spring and fall seasons. In the spring, they emerge from their overwintering spots to begin breeding again. The first batch of nymphs arrives around 11–19 days later. In the fall, box elderbugs congregate on south facing walls of structures in preparation for winter hiding, and emit an odor to attract other box elder bugs to their location. Take the offensive, and attack the fall boxelder bugs to keep them from becoming spring boxelder bugs. Offense is the best defense.
Identifying Box Elder Bugs
The larger black and red boxelder bugs are adults. The smaller, all red ones are nymphs.
Best Ways to Get Rid of Boxelder Bugs
Use a spray insecticide to kill outdoor boxelder bugs.
It’s really only worth spraying insecticide on your house when you have large clusters of boxelder bugs gathering around. A proper insecticide, like CyKick CS or Cynoff WP, contains the organic compound pyrethrin. You can also spray a product around the perimeter of your house, such as Cyonara LP, NiBan, and Demand G. Or just grab some Raid and go to town on those little buggers. Amazon has niban in a 4lb shaker for a reasonable price.
Use insecticide in crevices and cracks to kill boxelder bugs.
If you have a problem with boxelder bugs getting in your house, make sure you get some insecticide in any cracks and holes around the windows and doors. Aerosol sprays like Invader HPX, Air-Devil HPX, or Microcare, or dusts like Drione, boric acid, or diatomaceous earth are all excellent options. Of course, if you just sealed up those holes you wouldn’t have to do this at all.
Prevent boxelder bugs from getting inside by sealing your house.
In the fall, boxelder bugs are congregating to find a place to overwinter. If they are collecting on the southern wall of your home, they are going to try to get inside. Seal up your house using caulk, cement, wire mesh, netting, or whatever else you might have handy. Make sure to do it before the end of summer before the bugs crawl inside.
Suck up boxelder bugs inside.
Use a strong, sealed vacuum unit to suck up boxelder bugs inside your home. They stink, so don’t smash. You will want to get rid of them as quickly as possible, since they emit an odor that attracts more box elderbugs. Find out how they are getting in and seal it up tight, or else you will be vacuuming them up all winter long.
Catch hiding boxelder bugs with traps.
Traps are useful for catching and killing boxelder bugs in hard to reach places like ceilings, basements, and crawlspaces. There are many types of traps available, and the best make use of lights or stickiness. A glue board can be placed and used for many weeks to catch boxelder bugs, with the added bonus of not requiring electricity like light traps.
Using Chemical Pesticides to Kill Boxelder Bugs
There are so many types of insecticides on the market that it is good to take a moment and encourage you to find out what your active ingredients are before you spray it all over your home. The active ingredient is always listed on the bottle, and right near that should be a warning label that will give you some idea of what not to spray it on. Usually spraying it in moist areas like eyes and mouths are not advised. You may also want to ask the sales clerk to provide you with the MSDS (material safety data sheet). This sheet of legally required information is the quickest way to find out if this particular pesticide will harm you, your kids, or your neighbor’s dog. If you are truly concerned about spraying deadly toxins into the air, check out the section below.
Best Natural Boxelder Bug Killers
These soaps are effective at removing the cuticle of the boxelder bugs, leading their death. However, the soap must be sprayed directly onto the bugs. As it has no residual effects, this makes insecticidal soap effective at getting rid of dense clusters of boxelder bugs, but little else. If you do want to try this option, you can try Safer Insecticidal Soap (which you can get at Amazon)
Pyrethrins are a derivative of the chrysanthemum flower, and have great power as a residual insecticide. They come as sprays, powders, dusts, and aerosols. So if you spray it on the building, it should keep bugs off for several days, unless rain washes it off.
Removing boxelder trees.
Removal of the boxelder tress (acer negundo) is drastic, but will keep boxelder bugs away. The bugs are particularly attracted to the seeds, so removing the seeds in the fall can also help reduce their numbers and make your life a bit easier.