News Flash

Wright County News

Posted on: March 16, 2021

U of M Extension Offers Tips on Dealing with Nuisance Insects

By Adam Austing and Katie Drewitz, University of Minnesota Extension educators

With the recent increase in temperature you may begin to notice insects in your home. These insects include cluster flies, boxelder bugs, sowbugs, multicolored Asian lady beetles and more. Fortunately, these insects are harmless, although they can be annoying, especially when a lot of them are present.

Here are a few things to keep in mind when dealing with nuisance insects.

First, it is important to know that these insects are not reproducing indoors. Due to the emergence from their hiding places periodically throughout the winter and early spring, it appears they are laying eggs and their offspring are emerging. In fact, all of the insects you see now entered your home last fall.

They hibernate in balls or clusters in wall voids, attics, and similar areas. As the temperatures warm, the insects in the outer layers become active first and then emerge into the living quarters of the home, explaining why they do not all become active at the same time.

Since these insects are emerging from hidden sites, it is not practical to treat them to prevent their emergence. Once they are out in the open, your best bet in dealing with them is physical removal, such as vacuuming. Eventually, all of these overwintering insects will become active and move away from their overwintering sites.

To minimize these kinds of problems in the future, it is important to treat these insects in the fall as they are first trying to enter your home. This is a two-pronged approach. First, it is important to inspect the outside of the home during summer and seal spaces and gaps that may be used by the insect to get inside. This can be followed up with an insecticide application in the fall, just as these insects are trying to get inside. This insecticide application is typically applied to the outer perimeter of the home. It is not possible to prevent all nuisance insects from entering into a home, but you can reduce the number that do, causing fewer headaches later during the winter and spring.

If you have further questions you are welcome to visit or contact your local Extension Office. Residents in Wright County can reach Adam Austing at or (320) 249-5929.

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