The University of Wisconsin-Madison Insect Diagnostic Lab, created in 1978, supports the public and local county extension offices by receiving and analyzing several thousand insect samples each year. Every year, about two or three non-native insect species are discovered in Wisconsin. Some are only annoyances; others bring serious trouble. The latter is the case with the viburnum leaf beetle.
In Wisconsin, the beetle was first discovered in 2014 in counties west of Milwaukee. In 2019, UW-Madison entomologist P.J. Liesch, on a walk with his family, found an infested shrub. This spring, Liesch fielded dozens of questions from gardeners asking about it, as did Lisa Johnson, a Dane County Extension horticulture educator.