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 […]

Volutella Blight

Gina Muscato and Brian Hudelson, UW-Madison Plant Pathology Revised:  8/13/2012 Item number:  XHT1191 What is Volutella blight?  Volutella blight is a common and potentially lethal disease of Japanese pachysandra (Pachysandra terminalis), an evergreen, semi-woody groundcover that is grown in shade gardens throughout hardiness zones 4 and 5 in Wisconsin.  Volutella blight can severely limit the […]

Weir’s Cushion Rust of Spruces

Glen R. Stanosz, UW Madison Plant Pathology, and Forest Ecology and Management Revised:  8/13/2012 Item number:  XHT1119 What is Weir’s cushion rust? Weir’s cushion rust is a needle disease that disfigures and reduces growth of spruce trees (Picea spp.) of all ages.  This disease has been known in both eastern and western regions of the […]

White Pine Blister Rust

Joseph Schwartz, UW-Madison Forest Ecology and Management and Glen R. Stanosz, Ph. D., UW Madison Plant Pathology Revised:  8/13/2012 Item number:  XHT1118 What is white pine blister rust? White pine blister rust is a serious, tree-killing disease of eastern white pine and its close relatives (pines with needles in bundles of five).  This disease is […]

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 […]

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.  […]

Black Spot

Adrian Crabb* and Brian Hudelson, UW-Madison Plant Pathology *Completed for Plant Pathology 300 Revised:  8/13/2012 Item number:  XHT1089 What is black spot?  Black spot is a common and potentially serious leaf spot disease affecting many types of roses.  Black spot is found wherever roses are grown. What does black spot look like?  Black spot lesions […]


Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised:  8/13/2012 Item number:  XHT1130 Scales are probably one of the most difficult insects to control because of their protective covering.  There are many species of scales, but they can all be categorized as either soft or armored.  Soft scales are tropical insects and are economically more […]

Two-Lined Chestnut Borer

Phil Pellitteri, UW Insect Diagnostic Lab Revised:  8/13/2012 Item number:  XHT1155 The most important insect cause of oak mortality is the two-lined chestnut borer (Agrilus bilineatus).  This insect is attracted to stressed and weakened oaks.  Environmental extremes (e.g., drought), construction injury to roots, soil compaction, road salt injury, defoliation by leaf-feeding insects, storm damage and […]

Field Ants

Phil Pellitteri Revised:  1/25/2011 Item number:  XHT1204 One of the most common ants in Wisconsin is the field ant (Formica spp.).  This ant is noted for producing large mounds that can ruin the aesthetics of home lawns, make lawn mowing difficult, and interfere with the growth of herbaceous and woody ornamentals. Appearance:  Field ants are […]

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