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Boisea trivittata is an American species of true bug, commonly known as the Box Elder Bug, the Zug, or Maple Bug. It is found primarily on boxelder trees, as well as maple and ash trees  . The adults are about 12½ mm (½ in) long with a dark brown or black coloration, relieved by red wing veins and markings on the abdomen. Nymphs are bright red.
The boxelder bug is sometimes known as a garage beetle or may be confused with other Jadera spp., especially Boisea rubrolineata. The name "stink bug," which is more regularly applied to the family Pentatomidae, is sometimes used to refer to Boisea trivittata. Instead, these insects belong to the family Rhopalidae, the so-called "scentless plant bugs". However, boxelder bugs are redolent and will release a pungent and bad-tasting compound upon being disturbed to discourage predation; this allows them to form conspicuous aggregations without being preyed on.
These highly specialized insects feed almost exclusively on the seeds of Acer species. Although they may occasionally pierce plant tissues while feeding, they are not known to cause significant damage and are not considered to be agricultural pests.
They may form huge colorful aggregations while sunning themselves in areas near their host plant (e.g. rocks, shrubs, trees, and man-made structures). However, their presence can frighten and annoy people, thus they are considered nuisance pests. This is especially a problem during the cooler months, where they sometimes invade houses and other man-made structures seeking warmth or a safe place to overwinter. They remain inactive inside the walls (and behind siding) while the weather is cool, without doing any damage to the building.
When the heating systems revive them, some may falsely perceive it to be springtime and enter inhabited parts of the building in search of Acer or Koelreuteria seeds, water, and conspecifics (many of which they are unlikely to find in a building). In the spring, the bugs leave their winter hibernation locations to feed and lay eggs on maple or ash trees; aggregations may be seen during this time and well into summer and early fall, depending on the temperature.
These insects can be killed with a dilute mixture of soap and water — 2 tablespoons per gallon — sprayed on them directly. This procedure can stain or discolor siding however. Natural insecticides have also been proven to be very effective in killing these bugs and eliminates the possible damage to siding. A small strip of duct tape can also be an effective way of killing these insects, as they seldom will fly away when approached. Unable to escape from the adhesive backing, they can then be disposed of. They can also be kept out of the home, to a degree, by putting boric acid and/or diatomaceous earth in places they would gather to enter, as well as by using weather stripping and other means to seal the house better.
Another well proven technique[by whom?] is to spray them with streaming wasp and hornet insecticide. The aerosol cans allow one to surprise them from a distance, and will kill them instantly. Not all flying insect sprays will kill them; products specified for wasps should be used. This technique is most effective when they are gathered in large groups in the spring.
The best way, however, to eliminate and prevent them is to hire a professional to treat the outside of your home.[weasel words] They will put a residual down on the outside of the home that will not only eliminate current bugs crawling on the outside, but will kill any future boxelders that land on your home. The best times for this treatment is spring and fall when the boxelders are most active.
Citric (especially orange) based disinfectants have been found quite effective to clean the areas where they congregate, keeping them away.