Armillaria Root Disease
Armillaria root disease, a/k/a 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.
View ArticleHerbicide 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. Learn symptoms and more in this factsheet.
View ArticleTar Spot of Trees and Shrubs
Tar spot is a common, visually distinctive and primarily cosmetic fungal leaf spot disease that can affect many species of maple, including silver maple, sugar maple and Norway maple. Learn more in...
View ArticleDeciduous Trees Disorder: Miscellaneous Causes of Decline
This fact sheet explores sun scald, girdling roots, mower injury, previous defoliation, graft incompatibility, twine and tree wrap injury, and gas leaks as common causes of tree decline and death.
View ArticleGray Mold (Botrytis Blight)
Gray mold (or Botrytis blight) is a common and often serious fungal disease that can affect plants of all kinds. Learn more in this factsheet.
View ArticleGymnosporangium Rusts
Gymnosporangium rusts, such as Cedar Apple Rust, need both junipers and woody plants in the rose family to complete their life cycle. Learn more in this factsheet.
View ArticleDeciduous Tree Leaf Disease Quick Reference
This factsheet will help with the identification of some common leaf diseases of deciduous trees.
View ArticleShade Trees Disorder: Decline, Dieback, or Early Senescence
Learn about tree decline and dieback symptoms and how to prevent and treat problems that occur in this publication
View ArticleThyronectria Canker
Authors: Brian Hudelson, UW Plant PathologyLast Revised: 12/16/2021D-number: D0114 What is Thyronectria canker? Thyronectria canker is a common fungal disease of honeylocust (Gleditsia triacanthos),...
View ArticleBlister Canker
What is blister canker? Blister canker (also known as nailhead canker) is a potentially lethal disease that primarily affects apple and crabapple trees. Other trees and shrubs grown in Wisconsin that...
View ArticleRed Star Rust
Red star rust (also known as Japanese apple rust or lipstick rust) is a type of Gymnosporangium rust. This plant disease is particularly concerning because of its potential negative impact in...
View ArticleSilver Leaf
What is silver leaf? Silver leaf is a fungal disease that affects a wide range of deciduous trees. The disease has its biggest impact in fruit trees such as apple, pear and cherry, but can also...
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