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 […]


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 […]

Black Vine Weevil

R. Chris Williamson, UW-Extension Turf and Ornamental Specialist Revised:  8/13/2012 Item number:  XHT1065 The black vine weevil was first detected in Connecticut in 1910, and was reported to have been accidentally imported from Europe through the movement of ornamental plants. Subsequently, it has spread across the northern U.S., including Wisconsin. There is a closely related […]

Winter Salt Injury and Salt-tolerant Landscape Plants

Laura Jull, UW-Extension Revised:  8/13/2012 Item number:  A3877 This publication focuses on recognizing and preventing plant damage caused by deicing salts, evaluates the pros and cons of alternatives to rock salt, and provides an extensive list of salt-tolerant plants.   Download Article

Conifer Disease Quick Reference

Authors: Brian Hudelson, UW-Madison Plant PathologyLast Revised: 04/30/2021D-number: XHT1025 Root and Crown Rots Hosts: All conifers Pathogens: Pythium spp., Phytophthora spp., Rhizoctonia solani, Fusarium spp., Cylindrocarpon spp. Signs/Symptoms:  Poor growth, branch dieback, discolored and deteriorated roots For more information see: UW Garden Facts XHT1070   Rhizosphaera Needle Cast Hosts: Colorado blue spruce, other spruces, many other conifers Pathogen: Rhizosphaera kalkhoffii Signs/Symptoms:  Browning/purpling of interior needles of lower branches, followed by needle drop For more […]

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

Plants Not Favored by Deer

If deer visit your property, you’ve likely already experienced the frustration of having landscape plants destroyed overnight. Before planting (or replanting), check out this list of trees, shrubs, flowers, herbs, and grasses that deer tend to avoid.

Spruce Spider Mite

Phil Pellitteri, UW Insect Diagnostic Lab, UW-Extension Revised:  8/13/2012 Item number:  XHT1109 Spruce spider mites can attack a number of conifers including spruce, hemlock, white cedar (arborvitae), larch, and juniper. These mites go through four to six generations per year and populations can explode under warm, dry conditions. Spider mites feed by sucking on plant […]

Root and Crown Rots

Brian Hudelson, UW-Madison Plant Pathology and Laura Jull, UW-Madison Horticulture Revised:  8/13/2012 Item number:  XHT1070 What is root/crown rot? Root/crown rot is a general term that describes any disease of woody ornamentals where the pathogen (causal organism) attacks and leads to the deterioration of a plant’s root system and/or lower trunk or branches near the […]

Rhizosphaera Needle Cast

Rhizosphaera needle cast is the most common disease of Colorado blue spruce in Wisconsin. It makes Colorado blue spruce unsightly and unusable in many landscape settings. The disease can also affect other conifers including black, Engelmann, Serbian, Sitka, and white (e.g., Black Hills) spruce; Austrian, mugo and eastern white pine; Douglas-fir, balsam fir and western hemlock.

Pine Root Collar Weevil

Vijai Pandian, UW-Extension Brown County and Phil Pellitteri, UW Insect Diagnostic Lab Revised:  8/13/2012 Item number:  XHT1183 Pine root collar weevil is a destructive pest of Austrian pine, Scots pine, red pine and more rarely Eastern white pine.  Young Austrian, Scots and red pines that are two to four inches in diameter at the soil […]

Phomopsis Tip Blight

Gina Foreman* and Brian Hudelson, UW-Madison Plant Pathology *Completed as partial fulfillment of the requirements for Plant Pathology 875 – Plant Disease Diagnostics Clinic Internship at the University of Wisconsin Madison Revised:  8/13/2012 Item number:  XHT1099 What is Phomopsis tip blight? Phomopsis tip blight is one of the most common fungal diseases of conifers in […]

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