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Pest Management Priducts Division of CSPA
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Damage
Boxelder bugs are attracted to lights and will readily fly in through open doors and windows. While they do not cause direct injury to people, pets or buildings, periodically populations can soar. Large populations of boxelder bugs can be annoying and insects can spot curtains, furnishings, and clothing with their excrement. When crushed, they give off a foul odor. They do not breed indoors and if trapped in basements or houses, they will eventually die. Boxelder bugs do little damage to ornamental trees although they may occasionally cause puckering or distortion of fruit in commercial orchards, but this is rare and not a significant problem.