Potato Leafhopper

Authors: David M. Lowenstein and Russell L. Groves, UW-Madison, Department of Entomology Last Revised: 05/06/2020 X-number: XHT1132 Potato leafhopper (PLH), Empoasca fabae, is a potentially serious annual pest of a wide range of plants including, but not limited to, alfalfa, apple, beans (all types), clover, dahlia, eggplant, potato, rhubarb, soybean, strawberry and many types of bedding plants.  In Wisconsin, […]

Squash Bug

Authors: David Lowenstein and Russell Groves, UW-Madison Entomology Last Revised: 03/05/2020 X-number: XHT1135 Squash bugs (Anasa tristis) are an emerging problem in Wisconsin.  In recent years, these insects have become more prevalent, causing damage to vine crops in home gardens and commercial fields alike.  Squash bugs feed on all vine crops, but pumpkins and squash are their preferred […]

Squash Vine Borer

Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised:  1/9/2005 Item number:  XHT1136 The squash vine borer (Melittia cucurbitae) is an annual pest of pumpkins and squash.  This insect is often not recognized as a potential pest, but can be economically important in some years.  Winter squash is highly susceptible to attack. Appearance:  The adult […]

Whiteflies

Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised:  4/26/2004 Item number:  XHT1127 Whiteflies are not true flies although they look fly-like.  They actually belong to the same order of insects as scales, aphids, and mealybugs: the order Homoptera.  There are several species of whiteflies that can infest greenhouses including the greenhouse (Trialeurodes vaporariorum), sweet […]

Wireworms

Authors: David Lowenstein and Russell Groves, UW-Madison Entomology Last Revised: 05/22/2020 X-number: XHT1045 Wireworms are the larvae of several species of click beetles (Family Elateridae).  These beetles flip into the air with an audible click when turned on their backs.  Wireworms feed primarily on grasses (including grass crops such as corn) but have a broad host range that […]

Asparagus Beetle

Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised:  1/12/2005 Item number:  XHT1137 The common asparagus beetle (Criocercis asparagi) and spotted asparagus beetle (Crioceris duodecimpunctata) are annual pests of asparagus in Wisconsin.  The common asparagus beetle is the more prevalent of the two species and the only one that causes economic damage to asparagus in […]

Cabbage Maggot

Authors: David Lowenstein and Russell Groves, UW-Madison Entomology Last Revised: 05/22/2019 X-number: XHT1030 The cabbage maggot (Delia radicum) is an early season pest of cruciferous/cole crops (e.g., cabbage, broccoli, Brussels sprouts, cauliflower, kohlrabi, rutabaga, turnip, and radish), as well as cruciferous weeds (e.g., wild mustard, water cress, wild radish). Cabbage maggot damages plants by feeding […]

Imported Cabbageworm

Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised:  5/28/2004 Item number:  XHT1032 The imported cabbageworm (Pieris rapae) is a lepidopteran insect and the most important cole crop pest in Wisconsin.  All cole crops, including cabbage, broccoli, Brussels sprouts, cauliflower, and rutabaga, are susceptible to attack by this insect. Appearance:  Imported cabbageworm adults are the […]

Diamondback Moth

Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised:  5/28/2004 Item number:  XHT1031 The diamondback moth (Plutella xylostella) 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. Appearance:  The diamondback moth is a small, […]

Hornworms

Author: Russell Groves, UW-Madison Entomology Last Revised: 05/01/2020 X-number: XHT1107 Tomato hornworms (Manduca quinquemaculata) and tobacco hornworms (M. sexta) are large, blue-green caterpillars (larvae) with a spine (horn) on the posterior (rear) end.  These insects do not typically cause significant damage in commercial vegetable fields.  However, large numbers of larvae can occasionally occur in home gardens, leading to […]

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 […]

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