Armillaria Root Disease

Armillaria root disease, also known as shoestring root rot, can affect most conifer and hardwood species, and is an often lethal disease of tree and shrub roots and lower stems. Learn more in this factsheet.

Woody Ornamentals Pest Management in Wisconsin

An indispensable resource for nursery growers, this publication identifies pests of trees and shrubs in the state plus the products available for their control.

Deciduous Tree Galls

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.

Maple Gall Mites (Eriophyidae)

Inside little green or red bumps or other weird growths on maple leaves are tiny eriophyid mites, feeding on the developing gall tissue. Learn more about these mites and what to do about them in this article on maple gall mites.

Chlorosis

Chlorosis is a common nutritional disorder of many woody ornamentals in Wisconsin, particularly in the southern and eastern parts of the state. This factsheet describes symptoms, causes and cures.

Scorch and Related Problems in Trees and Shrubs

Scorch, or the browning of leaf edges, affects a wide range of deciduous and evergreen plants throughout Wisconsin. This factsheet will help you identify causes of scorch.

Oak Wilt

Oak wilt can be lethal, especially to oaks in red oak group. Learn about this disease of oaks, the life cycle and management options.

Powdery Mildew – Trees and Shrubs

Powdery mildew is a disease that occurs on the above-ground parts of many deciduous trees and shrubs, as well as herbaceous ornamental plants, indoor houseplants, and many agricultural crops. Learn more in this factsheet.

Deciduous Trees Disorder: Springtime Weather Injury to Foliage

Springtime weather injury can cause misleading symptoms on foliage. This fact sheet describes symptoms and steps to minimize the likelihood of injury.

Anthracnose

Anthracnose is the name of several common fungal diseases that affect the foliage of woody ornamentals in Wisconsin. This factsheet describes symptoms and management.

Winter Salt Injury and Salt-tolerant Landscape Plants

This article focuses on recognizing and preventing plant damage caused by deicing salts, evaluates the pros and cons of alternatives to rock salt, and provides an extensive list of salt-tolerant plants.

Black Knot, Apiosporina morbosa

Large swollen dark-colored growths on plum and cherry trees are caused by a fungal pathogen that causes the disease known as black knot. To learn more about this disease and how to manage it, read this article.