A Crash Course on How to Get Rid of Box Elder Bugs
Boisea trivittata is a North 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.
Although they specialize on Acer seeds, they may pierce plant tissues while feeding. They are not known to cause significant damage and are not considered to be agricultural pests. Removal of boxelder and other Acer species can help in control of bug populations.
They may form large aggregations while sunning themselves in areas near their host plant (e.g. on rocks, shrubs, trees, and man-made structures). However, their congregation habits and excreta can annoy people, thus they are considered nuisance pests. This is especially a problem during the cooler months, when they sometimes invade houses and other man-made structures seeking warmth or a place to overwinter. They remain inactive inside the walls (and behind siding) while the weather is cool.
When the heating systems revive them, some may falsely perceive it to be springtime and enter inhabited parts of the building in search of food, water, and conspecifics. 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.
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