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.
Deciduous Trees & Shrubs
Trees and shrubs are the backbone of our landscapes. Properly placed and well-maintained landscape plants help conserve energy, provide shade, increase the property values, attract wildlife, offer privacy and help us create peaceful outdoor living environments. Many trees and shrubs also exhibit showy flowers, vibrant fall foliage colors, and edible fruits. Learn from our publications and fact sheets about selecting, planting and maintaining trees and shrubs in Wisconsin landscapes.
Featured Tree & Shrub Articles
Choosing the Right Landscape Plants: Factors to Consider
Plant selection is one of the most important decisions a gardener, landscaper or designer makes. Learn more about selecting plants in this publication.
Is My Ash Tree Worth Treating for Emerald Ash Borer?
When should I treat my ash tree for EAB? This factsheet addresses some of the most frequently asked questions regarding the treatment of ash trees for EAB, and the removal and disposal of infested trees.
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Articles
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.
Protecting Your Tree From Emerald Ash Borer
EAB was discovered in Wisconsin in 2008 and has been slowly spreading ever since. In this video, entomologists demonstrate how homeowners can protect their trees from this insect.
Is My Ash Tree Worth Treating for Emerald Ash Borer?
When should I treat my ash tree for EAB? This factsheet addresses some of the most frequently asked questions regarding the treatment of ash trees for EAB, and the removal and disposal of infested trees.
Ash Alternatives for Homeowners and Professionals
Find suggestions for which trees to plant to replace ash trees, which are being devastated by Emerald Ash Borer.
Homeowner Guide to Emerald Ash Borer Insecticide Treatments
This factsheet describes considerations and products for treating ash trees with insecticides to control Emerald Ash Borer.
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.
Home Landscape Insecticides
This factsheet describes active ingredients available for homeowners and the landscape insects they control.
Lilacs for Cold Climates
Learn about the best-rated lilacs for Wisconsin’s cold climate, and how to care for these plants for years of enjoyment.
Degree Day Calculation
Degree Days incorporate temperature and time to quantify the rate of plant and insect development. This useful tool helps predict events such as flowering, harvest, and pest outbreaks.
Degree Days for Common Landscape Insect Pests
This factsheet lists degree days for emergence and hatching of a wide variety of landscape insect pests.
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.
