K.A. Delahaut, J.L. Wedberg Revised: 8/6/2012 Item number: A3655 The corn earworm, Helicoverpa zea, can cause serious economic damage to fresh market and processing sweet corn and hybrid dent seed corn. Also known as the tomato fruitworm, the larvae feed on field corn, tomatoes, lettuce, peppers, and snap beans. Learn how to identify and control […]
K.A. Delahaut Revised: 3/26/2012 Item number: A3751-E Spotted and striped cucumber beetles damage vine crops like cucumbers, squash, watermelons, muskmelons, and pumpkins. This fact sheet details the insect’s life cycle, the destruction it causes, and various means of effective control (2 pages). Download Article
K.A. Delahaut Revised: 3/26/2012 Item number: A3723-E In Wisconsin, the potato leafhopper (Empoasca fabae) is a serious annual pest of snap beans and potatoes. Damage caused by leafhoppers includes stunted plants, brown leaves, and reduced plant vigor. A wide range of plants serve as hosts for the potato leafhopper, including alfalfa, apples, all types of […]
K.A. Delahaut Revised: 3/26/2012 Item number: A3756-E The squash vine borer is an annual pest of pumpkins and squash. Winter squash are especially vulnerable. This fact sheet describes the insect’s life cycle, the damage it causes, and various effective means of control. Click on links to find this publication.
K.A. Delahaut Revised: 1/24/2001 Item number: A3754-E Leafminers are the larval stage of flies, moths, sawflies, and beetles that often cause damage to leafy edible plants such as spinach and chard. This fact sheet focuses on the serpentine leafminer, the vegetable leafminer, and the spinach leafminer and details their life cycles, the destruction they can […]
R. Chris Williamson, Turf and Ornamental Specialist Revised: 4/25/2004 Item number: XHT1022 Western flower thrips, Frankliniella occidentalis, are likely the most serious pest of greenhouse crops in the world. Thrips have spread throughout the horticulture industry on plugs, cuttings, and small plants. Because of thrips’ small size (1∕16 inch) and tendency to remain hidden in […]
R. Chris Williamson, UW Turf and Ornamental Specialist Revised: 4/25/2004 Item number: XHT1021 Several types of mites can cause serious damage to a variety of greenhouse crops. Among the most common mite species are the broad mite (Polyphagotarsoeneumus latus), carmine spider mite (Tetranychus cinnabarinus), cyclamen mite (Phytonemus pallidus), the Lewis spider mite (Eotetranychus lewisi), and […]
R. Chris Williamson, UW Turf and Ornamental Specialist Revised: 4/25/2004 Item number: XHT1020 Aphids can be persistent and serious pests in the greenhouse. Because of their high reproductive capability and resistance to numerous insecticides, they can be difficult to control. Aphids are sucking insects that damage greenhouse crops by causing curling and distortion of young, […]
Karen Delahaut, UW-Madison Fresh Market Vegetable Program Revised: 3/13/2008 Item number: XHT1097 Recently, several commonly-used insecticides for the control of insects in home vegetable gardens have been taken off the market. As a result, it’s becoming ever more challenging for home gardeners to find suitable insecticide products at garden centers, discount stores, and hardware stores. […]
Fungus gnats are considered a cosmetic problem in most situations, but larval feeding on plant roots has been associated with root rots in greenhouse settings. Shore flies (Scatella stagnalis) are another nuisance insect and are often confused with fungus gnats in the greenhouse.
Authors: David Lowenstein and Russell Groves, UW-Madison Entomology Last Revised: 05/20/2020 X-number: XHT1134 Onion thrips (Thrips tabaci) are an important annual pest of onion. They can attack many garden crops, but most commonly cause serious damage to onions, leeks and garlic. Appearance: Adult onion thrips are about 1/12 inch long, thin and pale yellow to brown in color. Their wings […]
Karen Delahaut, formerly UW-Madison Fresh Market Vegetable Program Revised: 1/9/2005 Item number: XHT1133 Onion maggots (Hylemya antiqua) are a common and often serious insect pest of plants in the onion family including onion (where they can be the most serious production problem), leeks, shallots, garlic, and chives. Onion maggots feed below ground on host bulbs, […]