The safety and well-being of our community is our highest priority. We know the recent news and allegations are deeply concerning, and we are committed to a safe environment for all. For more information, please see the official Cornell University statements.

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Do you already know what you have, or want more information? We have a number of factsheets available. 

In the Northeast, several kinds of outdoor insects are attracted to houses and building walls in autumn, searching for sheltered places to overwinter. Any that find gaps or openings can end up inside. During winter and spring on warm days you may see them indoors. Look below for information on any of these – as well as many other indoor pests, and outdoor species found on garden plants and trees.

By Topic

If any pdf or link does not work, please notify IDLDiagnosticLab [at] cornell.edu (IDLDiagnosticLab[at]cornell[dot]edu) and a copy can be emailed to you.

Pest Species

Biting/Stinging Bugs

Wood Pests

Plant Pests

Garden Pests

Pests of Houseplants

Other Fact Sheets