IMPORTANT: Out of Office Notice

The UW Insect Diagnostic Lab will be temporarily closed from July 25th — August 5th, 2024.  Lab services will resume the week of August 5th, 2024.

Samples that arrive at the diagnostic lab after 5 PM on Wednesday, July 24th will not be processed until the week of August 5th.


The University of Wisconsin Insect Diagnostic Lab was established in 1978 to provide timely and accurate identification of insects, insect-damaged materials, spiders, and other arthropods from around Wisconsin. The lab typically processes ~2,500 samples each year.

Part of the mission of the IDL is to provide support to the county extension offices throughout Wisconsin.  In addition, the diagnostic lab provides diagnostic services for the general public, private companies, agricultural producers, pest control professionals, the green industry, medical professionals, and other groups.  Homeowners are encouraged to first check with their local extension office for help as many samples can be handled in a more efficient manner locally.  Mail in samples, emails (with pictures if possible) and walk-in samples are all accepted.

The IDL also provides teaching and outreach services for the UW-Madison Department of Entomology.

LargeWormsonWillowsandElms
HoneyBee
MaskedHunterBug
GrapevineBeetle
ElmSawfly
TwiceStabbedLadyBeetleLarva
SpottedSlug
Firefly
CicadaKillerCloseUp
GypsyMoth_1

University of Wisconsin Madison