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.
Diseases & Disorders
Articles
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.
Plum Pox
Plum pox, aka “sharka”, is a virus disease that affects stone fruits such as plums, peaches, apricots and nectarines, making fruit deformed, tasteless and inedible. Learn about symptoms and management here.
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.
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.
Bitter Pit and Cork Spot
Bitter pit and cork spot are common disorders of Wisconsin apples, when weather conditions are just right. This factsheet describes what can be done to reduce the severity.
Bacterial Canker
Bacterial canker is a common and sometimes lethal disease of trees in the genus Prunus including cherry, plum and peach. This factsheet describes symptoms and management of bacterial canker.
Peach Leaf Curl
Peach leaf curl is a common disese of peach and nectarine trees, and can reduce tree vigor, fruit quality and yield. Learn symptoms and management options in this factsheet.
Fire Blight
Fire blight is the most destructive bacterial disease affecting plants in the rose family, including apple, pear, crabapple, hawthorn, cotoneaster, mountain ash, quince, rose, pyracantha, and spirea. Learn more here.
Downy Mildew
The downy mildews are a group of fungal diseases that cause destruction of the leaves, stems, flowers and fruits of many plants, including grapes, cucumbers and roses. Learn symptoms and controls in this factsheet.
Apple Scab
Apple scab is a potentially serious fungal disease of ornamental and fruit trees in the rose family. This factsheet describes symptoms, management and control of this sometimes serious disease.
Root and Crown Rots
This factsheet covers root/crown rot, which is a general term that describes disease of woody ornamentals where the causal organism attacks a plant’s root system and/or lower trunk or branches near the soil.
