Invasive Exotic Shrub Honeysuckles

Includes history, distribution, habitat, similar species, threats, identification and impact, of the shrub honeysuckles that are invasive in the Midwest. Photos and discussion of control strategies are also included.

Honeylocust Disorder: Canker Diseases in Wisconsin

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 […]

Lilacs for Cold Climates

Laura G. Jull Revised:  8/13/2012 Item number:  A3825 If you’re thinking about planting lilacs, here’s some timely help! UW-Extension’s Lilacs for Cold Climates describes the best of the top-rated cold-weather cultivars. These are the gems that will survive when winter temperatures tumble below zero. Every page dazzles with bouquets of blooms. Lilacs for Cold Climates […]

Nectria Canker

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. […]

Southern Blight

Authors: Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Last Revised: 01/03/2019 X-number: XHT1042   What is Southern blight?  Southern blight is a lethal fungal disease that is most common in the tropics and subtropics.  This disease causes damage in the southern U.S. and can even cause problems in temperate locations like Wisconsin during periods of warm, moist […]

Tatters

Rachel Leisso* and Brian Hudelson, UW-Madison Plant Pathology Revised:  8/13/2012 Item number:  XHT1141 What is tatters? Tatters is a leaf disorder affecting primarily members of the white oak group of oaks (i.e., oaks with leaves with rounded lobes) including bur, white and swamp white oaks.  Members of the red oak group of oaks (i.e., oaks […]

Tubakia (Actinopelte) Leaf Spot

Gina Foreman* and Brian Hudelson, UW-Madison Plant Pathology Revised:  3/11/2012 Item number:  XHT1104 What is Tubakia (Actinopelte) leaf spot?  Tubakia leaf spot, formerly known as Actinopelte leaf spot, is a common late-season leaf disease of oaks.  All species of oak appear to be susceptible to the disease, but oaks in the red oak group (such […]

Wood Mulch and Tree Health

Jane Cummings-Carlson and John Kyhl, Wisconsin Department of Natural Resources; Gina Foreman and Brian Hudelson, UW-Madison Plant Pathology Revised:  8/13/2012 Item number:  XHT1121 What are the benefits of wood mulch? Wood mulch is typically available as chipped wood, or shredded or chunked bark, and can contribute to tree health in many ways.  When high quality, […]

Root Rots in the Garden

Brian Hudelson, UW-Madison Plant Pathology and Laura Jull, UW-Madison Horticulture Revised:  5/20/2011 Item number:  XHT1072 What is root rot? Root rot is a general term that describes any disease where the pathogen (causal organism) attacks and leads to the deterioration of a plant’s root system.  Most plants are susceptible to root rots, including both woody […]

Crown Gall

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  5/5/2005 Item number:  XHT1037 What is a crown gall?  Crown gall is the most widely distributed bacterial disease of plants in the world, affecting over 100 species of fruit crops, and woody and herbaceous ornamentals, including rose, euonymus, lilac, poplar, viburnum, willow, apple, pear, brambles, stone […]

Butternut Canker

Rachel Leisso*, Montana State University Plant Sciences and Plant Pathology* Completed as fulfillment for Plant Pathology Revised:  8/13/2012 Item number:  XHT1142 What is butternut canker?  Butternut canker is a fungal disease of Juglans cinerea, the butternut tree (also known as white walnut or oilnut).  The disease is thought to have originated outside of the U.S.  […]

Bird’s Nest Fungi

Amy Gibbs* and Brian Hudelson, UW-Madison Plant Pathology Revised:  5/31/2005 Item number:  XHT1105 What are bird’s nest fungi?  Bird’s nest fungi are a group of organisms named for their resemblance to miniature bird’s nests.  These fungi can be found all over the world, growing and reproducing on decomposing organic matter.  In temperate regions, bird’s nest […]

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