Jennifer Clifford, Amilcar Sanchez, Trenton Stanger, and Brian Hudelson,UW-Madison Plant Pathology Revised:  10/21/2006 Item number:  XHT1156 What is dodder?  Dodder is the name of several species of parasitic plants that are widely distributed in North America and Europe.  Plants parasitized by dodder include alfalfa, carrots, onions, potatoes, cranberries, a variety of herbaceous and woody ornamentals, […]

Rain Barrels

Mike Maddox, State Master Gardener Program Manager & Darren Lochner, Formerly of the UW-Extension Lower Chippewa River Basin Revised:  2/5/2008 Item number:  XHT1157 What is a rain barrel?  A rain barrel can be any large container designed to collect rain water.  Typically, rain barrels are placed at the bottom of downspouts in order to collect […]

Cicada Killer Wasps

Phil Pellitteri, UW Insect Diagnostic Lab Revised:  1/4/2011 Item number:  XHT1198 Cicada killer wasps have become very common in the southern half of Wisconsin.  These solitary wasps are up to 1½ inches long, and their black and yellow coloring makes them look like giant yellow jackets. Life Cycle:  Adult cicada killer wasps appear from mid-July […]

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 […]

Leafminers (vegetables)

Karen Delahaut, UW-Madison, Fresh Market Vegetable Program Revised:  1/5/2005 Item number:  XHT1044 Leafminers are insects that feed on the tissue between the upper and lower epidermal layers of leaves.  Leafminers can be serious problem on vegetables that are harvested for their foliage (e.g., spinach or chard).  Leafminers can be the larval stages of flies, moths, […]

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 […]

Cucumber Beetles

Authors: David M. Lowenstein and Russell L. Groves, UW-Madison, Department of Entomology Last Revised: 05/01/2020 X-number: XHT1092 Striped and spotted cucumber beetles are common pests of vine crops (e.g., cucumber, squash, pumpkin, watermelon) that can cause severe damage to roots, leaves, flowers and fruits, as well as interfere with pollination, leading to reduced fruit set.  In Wisconsin, the […]

Tobacco Rattle

Rachel Zwieg* and Brian Hudelson, UW-Madison Plant Pathology *Completed as partial fulfillment of the requirements for the Horticulture track of the Farm and Industry Short Course program at the University of Wisconsin Madison. Revised:  8/19/2010 Item number:  XHT1180 What is tobacco rattle? Tobacco rattle is a common and potentially serious viral disease that affects a […]

Corky Ringspot

Brian Hudelson and Amy Charkowski, UW-Madison Plant Pathology Revised:  8/19/2010 Item number:  XHT1186 What is corky ringspot? Corky ringspot (also known as spraing) is a potentially serious viral disease of potato that has recently been detected in Wisconsin.  The disease can cause severe losses due to the fact that it reduces potato tuber quality, making […]

Cabbage Looper

Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised:  8/19/2010 Item number:  XHT1029 The cabbage looper (Trichoplusia ni) is a lepidopteran insect and an important pest of cole crops in Wisconsin.  All cole crops, including cabbage, broccoli, Brussels sprouts, cauliflower, and rutabaga, are susceptible to attack by this insect.  In addition, cabbage loopers will also attack […]

Bean Leaf Beetle

Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised:  4/26/2004 Item number:  XHT1131 Bean leaf beetles (Cerotoma trifurcate) are becoming more of a problem in Wisconsin than they have been in the past. Warmer winters may allow overwintering adults to survive in record numbers. Host plants include snap and lima beans, peas, and soybeans, as well […]

Blossom End Rot

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  4/1/2005 Item number:  XHT1140 What is blossom end rot? Blossom end rot is a physiological disorder of tomato in which the tissue of the blossom end of the fruit (the portion of the fruit opposite the stem) breaks down and rots, thus reducing yield.  Pepper, eggplant […]

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