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Commercial Vegetable Production in Wisconsin—2023
Author(s) B. Z. Bradford, J. B. Colquhoun, S. A. Chapman, A. J. Gevens, R. L. Groves, D. J. Heider, G. R. W. Nice, M. D. Ruark, Y. Wang. This guide...
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Tomato and Pepper Disorders: Bacterial Spot and Speck
Author(s) Karen Delahaut, Walt Stevenson. Bacterial spot and speck are found wherever tomatoes or peppers are grown. On occasion, these diseases ...
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Weed Management in Organic Vegetable Production: A Practical Review of Applied Research
Author(s) Jed Colquhoun. This manual provides an objective analysis of organic weed management strategies, based on peer-reviewed and published ap...
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Brown Marmorated Stink Bug: An Invasive Insect Pest
Author(s) Christelle Guédot, Janet van Zoeren. In the summer of 2016, the brown marmorated stink bug (BMSB) was detected for the first time in agr...
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Tomato Disorders: Fusarium and Verticillium Wilts
Author(s) Karen Delahaut, Walt Stevenson. Fusarium and Verticillium wilts once routinely devastated tomato crops. However, the availability of res...
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Tomato Disorder: Physiological Fruit Problems
Author(s) Karen Delahaut, Walt Stevenson. Environmental factors can affect the look—and sometimes the flavor—of developing tomato fruits. Because ...
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Biological Control of Insects and Other Pests of Greenhouse Crops
Author(s) Susan E. Rice Mahr, Raymond A. Cloyd, Daniel L. Mahr, Clifford S. Sadof. Greenhouse managers wage ongoing battles with insect pests. Thi...
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Potato Late Blight
Author(s) Amanda Gevens, Jaime Wilbur. Late blight affects a variety of plants in the Solanaceae family but is best known for its destruction of ...
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Vine Crops Disorder: Angular Leaf Spot
Author(s) Karen Delahaut, Walt Stevenson. Angular leaf spot is a bacterial disease that can be economically damaging to cucumbers, honeydew melon,...
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Vine Crops Disease: Phytophthora Blight
Author(s) Karen Delahaut, Walt Stevenson. Phytophthora blight is a fungal disease capable of completely destroying zucchini, pumpkin, summer squas...
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Tomato Late Blight
Author(s) Amanda Gevens, Jaime Wilbur. Late blight can result in complete destruction of tomato crops if left unmanaged. Learn about the symptoms...
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Tomato Disorders: Early Blight and Septoria Leaf Spot
Author(s) Karen Delahaut, Walt Stevenson. Both early blight and Septoria leaf spot are potentially serious diseases that affect the leaves, stems,...
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Cole Crops Disorder: Clubroot
Author(s) Karen Delahaut, Walt Stevenson. Clubroot is an old and serious disease of cole crops, including Brussels sprouts, cabbage, Chinese cabba...
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Cole Crops Disorder: Blackleg
Author(s) Karen Delahaut, Walt Stevenson. Once a very destructive disease, blackleg of cole crops has become less important with the introduction ...
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Cole Crops Disorder: Black Rot
Author(s) Karen Delahaut, Walt Stevenson. Black rot is one of the most serious diseases of cole crops. Learn about black rot's life cycle, how it ...
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Caterpillar Pests of Cole Crops
Author(s) Karen A. Delahaut. This fact sheet covers the imported cabbageworm, the cabbage looper, and the diamondback moth. Scouting tips and effe...
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Carrot Diseases: Alternaria and Cercospora Leaf Blights
Author(s) Karen Delahaut, Walt Stevenson. Alternaria and Cercospora leaf blights are common fungal diseases of carrot leaves and petioles. Learn a...
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Cabbage Maggot
Author(s) K. A. Delahaut. Cabbage maggots are insects that damage cole crops by feeding on the plant's roots and lower stems. Wounds produced by t...
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Black Cutworm
Author(s) Karen Delahaut. Black cutworm larvae are active nighttime feeders, clipping many seedlings at or below the soil line. They prefer beets,...
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Beet Disorder: Cercospora Leaf Spot
Author(s) Karen Delahaut, Walt Stevenson. Cercospora leaf spot is the most prevalent and devastating disease of the table beet in Wisconsin. This ...
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Aster Leafhopper
Author(s) K. A. Delahaut Aster leafhoppers feed on vegetables, field crops, flowers and weeds, spreading aster yellows disease. Learn when to scou...
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Assessing the Decay Potential of Potato Crops
Author(s) Zahi K. Atallah, Walter R. Stevenson. Potato tubers may become infected in the field but show no symptoms for days, or even weeks, after...
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Asparagus Beetle
Author(s) K. A. Delahaut. The common and spotted asparagus beetle are common pests in Wisconsin. This fact sheet details the insects' life cycle, ...
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Analysis of the Snap Bean Root Rot Potential of Wisconsin Fields
Author(s) K. M. Kobriger, D. J. Hagedorn, W. R. Stevenson. Bean root rot is one of the most destructive diseases of commercially grown snap beans...
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European Corn Borer
Author(s) Eileen M. Cullen, John Wedberg. This fact sheet details the life cycle of the European corn borer, or Ostrinia nubilalis, including the ...
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Cucurbit Downy Mildew: Identification and Management
Author(s) Amanda Gevens, Michelle Marks. Cucurbit downy mildew is a destructive disease of all plants in the gourd family, including cucumber, wa...
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Cucumber Beetles
Author(s) K. A. Delahaut. Spotted and striped cucumber beetles damage vine crops like cucumbers, squash, watermelons, muskmelons, and pumpkins. Th...
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Corn Rootworms
Author(s) J. L. Wedberg. This fact sheet details the life cycle of the northern, western, and southern corn rootworms, the damage they can cause,...
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Corn Earworm
Author(s) K. A. Delahaut, E. M. Cullen, J. L. Wedberg. The corn earworm Helicoverpa zea can cause serious economic damage to fresh market and pro...
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Corn Disorders: Smut and Rust
Author(s) Karen Delahaut, Walt Stevenson. Common smut is caused by the fungus Ustilago maydis and is the most widespread disease of sweet corn, oc...
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Colorado Potato Beetle
Author(s) K. A. Delahaut This publication is packed with practical information for organic and conventional growers who encounter Colorado potato ...
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Potato Leafhopper
Author(s) K. A. Delahaut. In Wisconsin, the potato leafhopper (Empoasca fabae) is a serious annual pest of snap beans and potatoes. Damage caused ...
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Potato Disorders: Common Scab and Powdery Scab
Author(s) Karen Delahaut, Walt Stevenson. Two distinctly separate diseases commonly known as scab can infect potatoes, significantly reducing tube...
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Plastic, Fabric, and Marsh Hay Mulch with No-Till Organic Tomatoes
Author(s) Claire Strader, Julie Dawson. One of the most common criticisms of organic agriculture is that it relies too heavily on tillage. While o...
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Onion Thrips
Author(s) K. A. Delahaut. Onion thrips (Thrips tabaci) are an important annual pest of onion. They may attack nearly all garden crops, but serious...
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Onion Maggot
Author(s) K. A. Delahaut. Onion maggots (Hylemya antiqua) are tiny maggots that feed below ground on onion bulbs, making tunnels in the bulbs and ...
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