Scales

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 […]

Dead Man’s Fingers

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  8/13/2012 Item number:  XHT1201 What is 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 (e.g., wood barrels) that are in contact […]

Four-Lined Plant Bug

Carla Staab*, Milwaukee Area Technical College, and Phil Pellitteri, UW Insect Diagnostic Lab ompleted as partial fulfillment of the requirements for an associate degree in Horticulture at the Milwaukee Area Technical College. Revised:  4/27/2004 Item number:  XHT1101 The adult four-lined plant bug (Poecalocapsus linectus) is a 1∕2 inch long, yellowish to yellowish-green true bug with […]

Webworms

R. Chris Williamson, UW-Extension Turf and Ornamental Specialist Revised:  4/25/2004 Item number:  XHT1066 The term webworm is used to describe several insects whose caterpillars use silk to join plant parts together to form protective nests.  Two common insects that create nests in fruit and woody ornamental trees are the eastern tent caterpillar and the fall […]

Pear Slug (Pear Sawfly)

Phil Pellitteri, UW Insect Diagnostic Lab Revised:  12/30/2010 Item number:  XHT1200 Pear slugs are not true slugs (see University of Wisconsin Garden Facts XHT1040), but are larvae of the pear sawfly (Calora cerasi). These larvae feed and cause damage on many kinds of ornamentals and fruit trees, including cherry, cotoneaster, mountain-ash, pear, purple leaf plum […]

Degree Days for Common Landscape Insect Pests

Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised:  8/13/2012 Item number:  XHT1088 Ash Borer 1st instar larvae = 275-500 DD50 Ash Plantbug Nymphs = 100-200 DD50 Birch Leafminer 1st generation larvae = 275-500 DD50 Black Vine Weevil 1st generation adults = 400-600 DD50 2nd generation adults = 900-1000 DD50 Bronze Birch Borer Larvae = 400-500 […]

Cicadas

R. Chris Williamson, UW-Extension Turf and Ornamental Specialist Revised:  8/13/2012 Item number:  XHT1068 Adult periodical cicadas (Magicicada spp.) are black and have reddish-orange eyes and legs, and have clear wings with orange veins that are positioned over their bodies like a roof or canopy.  Male cicadas typically make a loud buzzing noise or squawk when […]

Bitter Pit and Cork Spot

Teryl Roper, UW-Madison, Dept of Horticulture Revised:  4/24/2004 Item number:  XHT1055 Bitter pit and cork spot are common disorders of Wisconsin apples. These two disorders don’t occur every year, but when weather conditions are just right (or just wrong, depending on your perspective) they can be major problems. This fact sheet describes the causes of […]

Proper Tree Planting Techniques (B&B)

Vijai Pandian, Horticulture Educator, Brown County UW-Extension Revised:  8/13/2012 Adopting proper tree planting techniques ensures long survival and good health of your trees. This publication is intended to guide homeowners, landscapers and individuals through the steps of proper tree planting techniques. This brochure shows you how to correctly plant balled and burlapped trees and shrubs. Download Article

Bacterial Canker

Mary Francis Heimann, O.S.F., Distinguished Outreach Specialist emerita at the University of Wisconsin-Madison and Brian Hudelson, UW-Madison Plant Pathology Revised:  12/9/2004 Item number:  XHT1026 What is bacterial canker?  Bacterial canker is a common and sometimes lethal disease of trees in the genus Prunus including cherry, plum and peach.  Bacterial canker is also known as “gummosis”, […]

Peach Leaf Curl

Authors: Patricia McManus and Brian Hudelson, UW-Madison Plant Pathology Last Revised: 04/06/2021 X-number: XHT1069 What is peach leaf curl? Peach leaf curl is a common disease of peach and nectarine trees throughout the Midwest and eastern U.S. Where the disease is severe, tree vigor and fruit quality and yield are reduced. Peach leaf curl often […]

Fire Blight

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  4/24/2004 Item number:  XHT1090 What is 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.  It can kill or disfigure a tree or shrub, depending on […]

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