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.
Diseases & Disorders
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.
Nectria Canker
Nectria canker is a common and potentially lethal disease that affects many species of trees and shrubs. This factsheet describes what nectria canker looks like and management options.
Southern Blight
Southern blight is a lethal fungal disease that is most common in the tropics and subtropics, but can cause problems in temperate locations like Wisconsin during periods of warm, moist weather. Learn more here.
Tatters
Tatters is a leaf disorder affecting primarily trees in the white oak group. This factsheet has more information about what Tatters is and symptoms to watch for.
Tubakia (Actinopelte) Leaf Spot
Tubakia (Actinopelte) leaf spot is a common late-season leaf disease of oaks, especially those in the read oak group. Learn symptoms and management in this factsheet.
Crown Gall
Crown gall is the most widely distributed bacterial disease of plants in the world. This factsheet describes what crown gall looks like and how to avoid problems with this disease.
Butternut Canker
Butternut canker is a fungal disease that affects native butternut trees, causing multiple cankers on trunks and branches, eventually killing the trees. Learn to recognize this disease in this factsheet.
Black Spot
Black spot is a common and potentially serious leaf spot disease affecting many types of roses. Learn about symptoms and management in this factsheet.
Dead Man’s Fingers
Dead man’s fingers is the name of a mushroom-like fungal growth that can be found at the base of dead or dying trees and shrubs, as well as wood objects. Learn about this distinctive fungus in this factsheet.
