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 […]

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 […]

Trichopoda pennipes, Parasitoid of Squash Bug

There are all kinds of flies in the Midwest. One interesting species is a medium-sized black and orange tachinid fly that develops in a number of true bugs, including squash bug. Although not really common, you may have this in your garden and not even know it! To learn more about this parasitoid, read this article…

Cucumber Beetles

In late summer and fall, cucumber beetles – and similar corn rootworms – are common visitors to squash and cucumber flowers. They are not pollinators, but actually eat the petals, and sometimes the plant foliage. The cucumber beetles are important pests because they also can tramsit diseases. To learn more about all of these beetles, read this article…

Squash Vine Borer, Melittia cucurbitae

The nemesis of almost everyone who tries to grow squash in the Midwest, squash vine borer is a difficult problem to control. The larvae of this day-flying moth tunnel in the stems of zucchini, winter squash and pumpkin, causing the plants to wilt and frequently die. To learn more about this native insect pest, read this article…


Many people are repulsed by the sight of an earwig and its intimidating back end. But those pinchers are mostly just for show, and these insects won’t harm people. They are primarily scavengers feeding at night, but they will eat some living plants and may cause damage at times. To learn more about these “icky” insects, read this article…

Floating Row Cover

Floating row cover is a great addition to any vegetable garden, as it can be used for several different purposes and is easy to use. Learn more about these specially designed fabrics in this article.

Mighty Mites

Did you know that there are mites that eat other mites? Barely visible to the naked eye, these little predators help keep spider mites and other pests in check. Read on to learn more about this fascinating world of tiny predatory mites…

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