Elderberry Rust
Elderberry rust is a visually striking cosmetic fungal disease that affects stems, leaves and flowers of plants in the genus Sambucus (i.e., elderberries), and also affects sedges (Carex spp.). Learn more in this factsheet.
Diseases & Disorders
Landscaping In Spite of Black Walnuts
Black walnut trees can have a dramatic, negative affect on certain plants. To learn more about juglone toxicity and which plants are suceptible, read this article…
January 2021: Saying Bye-Bye to Boxwood Blight: Proper Disposable of Holiday Wreaths
Holiday decorations containing boxwood foliage can be a source of disease for boxwoods in our landscapes. Learn more in this article.
Boxwood Blight
Boxwood blight (also known as box blight and boxwood leaf drop) is a devastating disease of boxwood (Buxus spp.) that can cause leaf loss and eventual death of affected shrubs. This factsheet covers symptoms and management.
Eastern Filbert Blight
Eastern filbert blight is a potentially serious fungal disease found throughout the United States, affecting Corylus species, commonly known as hazelnuts or filberts. Symptoms and management are described in this factsheet.
Cucumber Mosaic
Cucumber mosaic is a viral disease that affects a wide range of fruits, vegetables, herbaceous and woody ornamentals, and weeds. This factsheet covers identification and ways to prevent this incurable disease.
Oak Wilt Management—What Are the Options?
Oak Wilt fungal disease kills oaks throughout Wisconsin every year.
This publication focuses on the red oak group and tells how to prevent, identify, and control this disease.
Root-Knot Nematode
Root-knot nematodes are small, soilborne, worm-like organisms that infect many agricultural and horticultural plants. This publication describes the symptoms, and management of root-knot nematodes in Wisconsin.
Foliar Nematodes
Foliar nematodes are microscopic worm-like organisms that live in and on leaves (and other above-ground plants parts). Learn what to look for and how to manage foliar nematodes in this factsheet.
Thousand Cankers Disease
Though not yet found in Wisconsin, Thousand Cankers disease (TCD) is a serious, potentially fatal disease of black walnut, a native tree. Learn what to watch for here.
Rose Rust
Rose rust is a common fungal disease which affects affects many varieties of rose, with some varieties and hybrids more prone to the disease. Learn to identify and manage this disease in this factsheet.
Honeylocust Disorder: Canker Diseases in Wisconsin
Honeylocust is a common street and landscape tree. This factsheet presents the signs and symptoms of canker diseases of honeylocusts and how to best treat them.
