Spongy Moth

P.J. Liesch, UW Entomology and R. Chris Williamson, formerly UW Entomology Revised:  4/1/2022 Item number:  XHT1063 The spongy moth, Lymantria dispar (formerly known as the “gypsy moth”) is native to parts of Europe, Asia, and North Africa. It was inadvertently introduced to North America in New England in 1869 and has since spread westward. Over […]

Aphids

Aphids are soft-bodied, sucking insects that are sometimes called plant lice. They feed on plant sap and subsequently excrete a sugary substance (called honeydew) that can attract ants as well as support the growth of a saprophytic fungus called sooty mold. Learn about common aphids found in home gardens in this factsheet.

Herbicide Damage

Brian Hudelson, UW-Madison Plant Pathology Revised:  5/11/2010 Item number:  XHT1004 What is herbicide damage?  Herbicide damage is any adverse, undesired effect on a plant that is caused by exposure of that plant to a pesticide designed for weed control (i.e., a herbicide).  Any plant can be subject to this problem. What does herbicide damage look […]

Viburnum Leaf Beetle

The viburnum leaf beetle (VLB), Pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage Viburnum species. Currently found in limited areas, mostly in southeastern Wisconsin, its spread is being monitored. Identification and control are described in this factsheet.

Woody Ornamentals Pest Management in Wisconsin

Author(s): Chris Williamson, P.J. Liesch, Jim Kerns, Roger Flashinski Woody Ornamentals Pest Management in Wisconsin is an indispensable resource for nursery growers. This completely revised publication identifies pests of trees and shrubs in the state plus the products available for their control. It also notes products that are registered for use by homeowners (56 pages; […]

Summer Flowering Trees, Shrubs and Vines

Laura Jull, UW-Madison Horticulture Revised:  8/13/2012 Item number:  XHT1016 May Showers Bring Summer Flowers: Most gardeners think that spring is the time of year when woody plants flower.  However, many trees and shrubs flower from late spring to late summer.  Wisconsin homeowners can choose from a variety of plants listed below to insure continual bloom […]

Aphids, in-depth

Aphids may be viewed as just another pest for gardeners to try to eliminate, but they’re really fascinating insects, with bizarre lifestyles and eating habits and they’re also dinner for lots of other insects. Forming colonies covering the leaves and stems of plants, these small sap-sucking creatures reproduce incredibly fast and a few also transmit plant diseases. Learn more about this large group of insects and how to manage them in the garden in this article…

Deciduous Tree Galls

R. Chris Williamson, UW Turf and Ornamental Specialist, UW-Extension Revised:  8/6/2012 Item number:  XHT1024 Galls are abnormal growths on plants that can result from the feeding of living organisms such as bacteria, fungi, nematodes, insects and mites.  There are numerous galls that are caused by insects, the most common of which, in Wisconsin, are ash […]

Maple Gall Mites (Eriophyidae)

Have you found little green or red bumps or other weird growths on maple leaves and wondered what caused that? Inside each bump are tiny eriophyid mites, feeding on the developing gall tissue. If you want to learn more about these mites and what to do about this problem, check out this article on maple gall mites…

Protecting Your Tree From Emerald Ash Borer

R. Chris Williamson, UW Turf and Ornamental Specialist, UW-Extension and P.J. Liesch, Associate Researcher, UW-Madison Revised:  7/13/2012 The Emerald Ash Borer (EAB) is an invasive insect that is killing off Wisconsin’s ash trees. EAB was first discovered in Wisconsin in 2008 and has been slowly spreading ever since. In this short video, UW-Madison entomologists Chris […]

Is My Ash Tree Worth Treating for Emerald Ash Borer?

When should I consider treating my ash tree for EAB? This factsheet addresses some of the most frequently asked questions regarding the treatment of ash trees for emerald ash borer (EAB), and the removal and disposal of infested trees.

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