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 […]

Apple Pest Management for Home Gardeners

Patricia S. McManus, Daniel L. Mahr, Teryl R. Roper, UW-Extension Revised:  3/17/2011 Item number:  A2179 Home gardens usually contain only a few apple trees, making it feasible to limit pesticide use and still produce a healthy crop of apples. This extensively updated publication outlines the basic principles of pest management. Learn which non-chemical strategies are […]

Fruit Flies in the Home

Phil Pellitteri, UW Insect Diagnostic Lab Revised:  4/27/2004 Item number:  XHT1102 What people commonly call fruit flies are flies from the genus Drosophila.  Also known as pumice or vinegar flies, they range in size from 1∕16 to 1∕8 inch long, and are light to dark brown in color.  Some of the common species of fruit […]

Reducing Soil pH

Sherry Combs, formerly of the UW-Madison Soil and Plant Analysis Lab Revised:  10/27/2007 Item number:  XHT1151 Is your soil pH too high?  Probably not, although the popular press urges most gardeners to question whether their garden soil pH is ‘right’.  Only a soil test for pH can indicate whether the pH is ‘right’, and ‘right […]

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 […]

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 Fruit & Vegetable Insect Pests

Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised:  8/6/2012 Item number:  XHT1087 Common Vegetable Insects that can be monitored using degree days or indicator plants Cabbage Maggot Base temperature = 43°F 300, 1476, 2652 DD43 for 1st, 2nd, & 3rd generations flies 1st generation eggs are laid when the common lilac is in full bloom […]

Degree Day Calculation

Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised:  8/6/2012 Item number:  XHT1086 Indicator plants are not always suitable for the timing of pest management practices.  You may not have the critical indicator plant  nearby to time local activities, or there may not be a good indicator plant for a particular pest’s crucial life stage.  Another […]

Phenology

Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised:  5/17/2012 Item number:  XHT1085 The word phenology is derived from the Greek word phaino meaning “to show” or “to appear”.  Phenology is a branch of science that studies the relationships between periodic biological events—usually the life cycles of plants and animals—and environmental changes.  Natural events such as […]

Growing Blueberries in Containers

The blueberry is a wonderful fruit rich in vitamin C, dietary fiber, and vitamin E. Due to its popularity, there is a growing interest among gardeners to plant blueberries in backyard gardens.

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 […]

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