Skip to main content
University of Wisconsin-Extension entomologist
is director of the University of Wisconsin-Madison
Insect Diagnostic Lab
, and he
blogs about Wisconsin insects
Articles by PJ Liesch
The Invasive Elongate Hemlock Scale Makes A Return Incursion To Wisconsin
Jan. 2, 2020 | 2:30 p.m.
Christmas has come and gone for 2019, but an uninvited Grinch may still be lurking to steal the holiday spirit.
The Lily Leaf Beetle Jumps To New Footholds Across Wisconsin
Dec. 3, 2019 | 4:15 p.m.
It's been a big year for the lily leaf beetle in Wisconsin.
The Sweet Tooth And Unique Scent Of Odorous House Ants
June 20, 2019 | 10:30 a.m.
The easiest way to identify odorous house ants isn't by sight, but by smell.
When And Where Black Flies Are Out For Blood In Wisconsin
June 12, 2019 | 11:45 a.m.
Black flies — also called "buffalo gnats" due to their humpbacked appearance — are deceptive creatures for their small size.
Even A Polar Vortex Is No Match For Insects Adapted To Cold Conditions
March 19, 2019 | Noon
With daylight saving time back in place and warmer temperatures knocking at our door, spring is finally crawling toward Wisconsin.
Wisconsin's Top 10 Insect Trends Of 2018
Feb. 19, 2019 | 8 a.m.
In 2018, insects stood out in the state — there were no arachnids or other types of arthropods that made as much of an impression as the organisms on this list.
Series: Brown Marmorated Stink Bug
Brown Marmorated Stink Bug Strengthens Foothold Across Wisconsin
Nov. 28, 2018 | 10 a.m.
As of late 2018, 27 counties across Wisconsin have confirmed reports of the brown marmorated stink bug and a handful of others have suspected sightings.
Why Wisconsin Saw A Surge In Mosquitoes As Summer 2018 Ended
Oct. 31, 2018 | 10 a.m.
Wisconsinites generally expect mosquitoes to be "bad" from late spring through the summer, but for the pesky sanguivores to fade away as autumn approaches. However, September 2018 definitely bucked the trend.
The Purple Carrot-Seed Moth Lands In Wisconsin
Wisconsin Public Radio
Oct. 12, 2018 | 2:40 p.m.
The latest non-native pest to arrive in Wisconsin is the tiny purple carrot-seed moth, and its impacts are not yet fully known.
The Deceptive Sphinx Moth's Big Summer In Wisconsin
Sept. 25, 2018 | 11 a.m.
Observant visitors to parks and gardens around Wisconsin over the summer might have noticed a surprising creature hovering among the flowers — the hummingbird-like sphinx moth.
Load more [ + ]