Onion Thrips

Onion thrips are an important annual pest of onion, and can attack other garden crops as well, including leeks and garlic. Learn about these pests in this factsheet.

Onion Maggot

Onion maggots are a common and often serious pest of plants in the onion family, including onions, leeks, shallots, garlic and chives. Learn about these pests, the damage they cause, and control here.

Soil Contaminants in Community Gardens

Before siting and starting a community garden, learn about types and sources of potential contaminants, the basics of soil testing, and how to limit exposure to contaminants in this publication.

Potato Leafhopper

Potato leafhopper can be a serious annual pest of a wide range of plants, including apple, beans, dahlia, eggplant, potato, rhubarb, strawberry and many bedding plants. Learn more about this pest in this factsheet.

Whiteflies

Whiteflies are not true flies, but belong in the same order as scales, aphids and mealybuts. Several species can infest greenhouses. Learn how to identify and manage this pest in this factsheet.

Wireworms

Authors: David Lowenstein and Russell Groves, UW-Madison EntomologyLast Revised: 05/22/2020X-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 includes vegetables […]

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 […]

Extending the Garden Season

Cold frames and hot beds, hoop houses, cloches, and floating row covers allow gardeners to grow plants earlier in spring and later in fall. Get ideas that will work for you in this factsheet.

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