The elm zigzag sawfly is an invasive sawfly that attacks elm trees. Populations were detected in Wisconsin for the first time in July 2024 and were quickly found in several counties across the state. In many cases, damage may be minor, but this invasive pest does have the potential to cause significant defoliation of elm trees.
By: PJ Liesch, Extension Entomology Specialist Even though insects can cause damage to our plants, not all of them are harmful. In this video, you will learn how to look for signs of insects, why identification is required, and different control options and methods. The first step in the management process of insects in yards […]
The Japanese beetle, Popillia japonica, is a significant pest of landscape trees and shrubs, vegetable and fruit crops, and turfgrass. This factsheet describes the lifecycle of this beetle along with management and control options.
Pesky boxelder bugs are very noticeable in the fall when they congregate before overwintering in buildings. To learn more about this nuisance pest, read this article…
Brown marmorated stink bug is a non-native pest that feeds on awide range of plants. This insect is also a nusiance when it overwinters indoors. Learn about identification and management in this factsheet.
The term webworm is used to describe several insects whose caterpillars use silk to join plant parts together to form protective nests. Learn about two webworms found in Wisconsin in this factsheet.
Spongy moth (formerly gypsy moth) is a destructive insect when the caterpillars occur in large numbers and defoliate trees. This factsheet will help with identification and management of this pest.
Aphids are soft-bodied, insects that feed on plant sap and subsequently excrete a sugary substance that can attract ants as well as support a saprophytic fungus called sooty mold. Learn about aphids found in home gardens in this factsheet.
The viburnum leaf beetle (VLB), Pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage Viburnum species. Identification and control are described in this factsheet.
An indispensable resource for nursery growers, this publication identifies pests of trees and shrubs in the state plus the products available for their control.
Aphids are really fascinating insects, with bizarre lifestyles and eating habits Learn more about this large group of insects and how to manage them in the garden in this article…
Galls are abnormal growths on plants that can result from the feeding of living organisms such as bacteria, fungi, nematodes, insects and mites. Learn about common galls in this factsheet.
