Hollyhock Rust

Nicole Uelmen*, UW-Madison Plant Pathology Revised:  3/6/2014 Item number:  XHT1231 What is hollyhock rust?  Hollyhock rust is the most common fungal leaf disease of hollyhocks (Alcea rosea).  Many other ornamentals (e.g., flowering maple, rose mallow) and weeds (e.g., common mallow) in the mallow family are also susceptible.  Hollyhock rust can quickly spread, causing stunting of […]

Impatiens Downy Mildew

Jenna Lind, UW-Madison Plant Pathology Revised:  6/24/2013 Item number:  XHT1223 What is impatiens downy mildew?  Impatiens downy mildew is a disease that has become a serious threat wherever impatiens are grown.  The disease has recently become a serious issue in the United States, including Wisconsin.  Impatiens downy mildew has been so destructive in many areas […]

Maintaining Lawn and Garden Tools

When it comes to digging in the garden or pruning trees and shrubs, having high quality tools that are cleaned, lubricated, sharpened and otherwise properly maintained, makes any outdoor job simpler and more efficient. Learn how to maintain your garden tools in this useful factsheet.

Drought and Watering of Ornamental Plants

Laura Jull, Woody Ornamental Specialist, UW-Extension, UW-Madison Revised:  7/13/2012 Many of our established woody ornamentals can survive periods of prolonged drought. In response to drought conditions, some of our woody ornamentals, both native and exotic, can start the annual fall leaf defoliation a bit early during prolonged drought conditions.  Leaves can also turn brown and […]

Controlling Deer Damage in Wisconsin

Scott Craven, Scott Hygnstrom, Philip Peterson Revised:  1/24/2001 Item number:  G3083 Illustrates numerous methods for protecting crops and other property from deer. Offers designs for deer fences and other constructions, along with a list of repellents and scare devices (8 pages). Download Article

Managing Thrips in Greenhouses

R. Chris Williamson, Turf and Ornamental Specialist Revised:  4/25/2004 Item number:  XHT1022 Western flower thrips, Frankliniella occidentalis, are likely the most serious pest of greenhouse crops in the world.  Thrips have spread throughout the horticulture industry on plugs, cuttings, and small plants.  Because of thrips’ small size (1∕16 inch) and tendency to remain hidden in […]

Managing Mites in Greenhouses

R. Chris Williamson, UW Turf and Ornamental Specialist Revised:  4/25/2004 Item number:  XHT1021 Several types of mites can cause serious damage to a variety of greenhouse crops.  Among the most common mite species are the broad mite (Polyphagotarsoeneumus latus), carmine spider mite (Tetranychus cinnabarinus), cyclamen mite (Phytonemus pallidus), the Lewis spider mite (Eotetranychus lewisi), and […]

Managing Aphids in Greenhouses

R. Chris Williamson, UW Turf and Ornamental Specialist Revised:  4/25/2004 Item number:  XHT1020 Aphids can be persistent and serious pests in the greenhouse.  Because of their high reproductive capability and resistance to numerous insecticides, they can be difficult to control.  Aphids are sucking insects that damage greenhouse crops by causing curling and distortion of young, […]

Ralstonia Wilt

Pest Alert Authors: Brian Hudelson, UW-Madison Plant Pathology Last Revised: 05/01/2020 X-number: XHT1011 What is Ralstonia wilt?  Ralstonia wilt (also sometimes known as Southern wilt) is a usually lethal disease that affects over 250 plants in over 40 plant families.  Susceptible greenhouse-grown ornamentals include, but are not limited to, plants in the genera Capsicum, Cosmos, Cyclamen, Dahlia, Fuschsia, Gerbera, Hydrangea, Impatiens, Lantana, Nasturtium and Pelargonium.  Vegetables such as eggplant, pepper, potato […]

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 […]

Slime Molds

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  4/25/2004 Item number:  XHT1091 What is a slime mold?  Slime molds are members of a shape-shifting group of organisms called myxomycetes.  These organisms are found all over the world, even in deserts, high altitudes, and on the edges of snowbanks.  Although they often resemble fungi, slime […]

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