Certain pests move into structures in the fall in response to weather and shorter days signaling the approach of winter. Pests also move inside when their outside conditions become less than desirable: too hot, too dry, too wet, too crowded or when there's a drop in available food. Some outside arthropods are carried in on plants or firewood, or are attracted to lights, and don't want to be inside at all. But when a customer sees dozens of stink bugs or cluster flies in the living room, he wants to know what they are, whether they bite or spread disease, and maybe most importantly, whether they are going to reproduce and infest his home.
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