Author(s): Chris Williamson, P.J. Liesch, Jim Kerns, Roger Flashinski Woody Ornamentals Pest Management in Wisconsin is an indispensable resource for nursery growers. This completely revised publication identifies pests of trees and shrubs in the state plus the products available for their control. It also notes products that are registered for use by homeowners (56 pages; […]
Author(s): M.F. Heimann, G.L. Worf “Decline” is a general term that describes the deterioration of a tree’s crown or an overall reduction in vigor. “Dieback” indicates more localized symptoms, with healthy branches adjacent to dead or dying ones. Find out more about tree decline and dieback, how to spot the difference between the two, and […]
Author(s): M.F. Heimann, G.L. Worf Scorch, or the browning of leaf edges, affects a wide range of deciduous and evergreen plants throughout Wisconsin, especially ash, linden, maple, oak, pine, and spruce. While scorch is easily recognizable, it’s important to recognize that it is a symptom, not a cause. A number of problems cause symptoms that […]
Author(s): Jane Cummings Carlson, A. Jeff Martin, Kyoko Scanlon Thousands of oaks in woodland and urban settings die every year from oak wilt, a fungal disease that is widespread in Wisconsin, Minnesota, and Michigan. Both the red oak and white oak groups are susceptible, but trees in the red oak group fall prey to the […]
Author(s): M.F. Heimann, G.L. Worf Springtime weather injury can cause misleading symptoms on foliage. This fact sheet describes symptoms and steps to minimize the likelihood of injury (2 pages). Click on this link to view the PDF of this fact sheet.
Author(s): G.L. Worf., J.E. Kuntz Many problems and disorders can lead to tree 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 (4 pages). Click on this link to view the PDF of […]
Root-knot nematodes (Meloidogyne spp.) are small, soilborne, worm-like organisms that infect many agricultural and horticultural plants. This publication describes the symptoms, management and control of root-knot nematodes in Wisconsin.
Foliar nematodes are microscopic worm-like organisms in the genus Aphelenchoides. They live in and on the leaves (and other above-ground plants parts) of over 450 plant species in more than 75 plant families. They are commonly found on hostas, but can affect other herbaceous ornamentals. Learn what to look for and how to manage foliar nematodes in this factsheet.
Karen Schlichter, UW-Madison Plant Pathology Revised: 1/22/2014 Item number: XHT1228 What is thousand cankers disease? Thousand cankers disease (TCD) is a serious, potentially fatal disease of black walnut (Juglans nigra), a tree native to Wisconsin. TCD has not yet been reported in Wisconsin, but has been found in the western United States where it was […]
Robyn Roberts, UW-Madison Plant Pathology Revised: 6/8/2013 Item number: XHT1217 What is rose rust? Rose rust is a common fungal disease found in much of North America (including the continental United States) and Europe. Rose rust affects many varieties of rose, though some varieties (e.g., hybrids) are more prone to the disease. Rose rust has […]
G.L. Worf, M.F. Heimann Revised: 8/13/2012 Item number: A3281 The honeylocust has become an increasingly important street and landscape tree in Wisconsin. Finer textured and less formal than most other trees, the honeylocust forms a pleasing silhouette against large buildings or the open sky. In addition, lawns grow better under honeylocust than under most shade […]
Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised: 8/13/2012 Item number: XHT1094 What is Nectria canker? Nectria canker is a common and potentially lethal disease that affects many species of trees and shrubs. This disease can cause significant damage on newly planted, as well as on established, trees and shrubs that are under stress. […]