Powdery Mildew (Vegetables)

Brian Hudelson, UW-Madison Plant Pathology Revised:  2/18/2010 Item number:  XHT1005b What is powdery mildew? Powdery mildew is a disease that occurs on the above-ground parts (especially the leaves) of many agricultural crops (including vegetables), as well as deciduous trees and shrubs, herbaceous ornamental plants, and indoor houseplants.  Conifers are not affected by this disease. What […]

Potato Scab

Brian Hudelson, UW-Madison Plant Pathology Revised:  4/24/2005 Item number:  XHT1117 What is potato scab?  Potato scab is a common and disfiguring disease of potato tubers that affects potatoes wherever they are grown.  Thin-skinned potato varieties tend to be more severely affected.  This disease can also affect other root vegetables such as beets, carrots, parsnip, radish, […]

Southern Blight

Authors: Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Last Revised: 01/03/2019 X-number: XHT1042   What is Southern blight?  Southern blight is a lethal fungal disease that is most common in the tropics and subtropics.  This disease causes damage in the southern U.S. and can even cause problems in temperate locations like Wisconsin during periods of warm, moist […]

Septoria Leaf Spot

Brian Hudelson, UW-Madison Plant Pathology Revised:  3/10/2012 Item number:  XHT1073 What is Septoria leaf spot?  Septoria leaf spot is one of two common fungal diseases that can devastate tomatoes in both commercial settings and home gardens.  The second common tomato blight, early blight, is detailed in University of Wisconsin Garden Facts XHT1074. What does Septoria […]

Home Vegetable Insecticides

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 and Shore Flies in Greenhouses

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.

White Mold

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  4/25/2004 Item number:  XHT1115 What is white mold?  White mold is a serious, and often lethal, fungal disease that affects over 374 types of plants in many plant families.  It causes severe damage in commercial snap, kidney and lima bean production, as well as commercial sunflower […]

Edema

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  2/17/2012 Item number:  XHT1116 What is edema?  Edema (or oedema) is a physiological disorder that frequently occurs in houseplants, greenhouse plants, and other plants sheltered under plastic.  This disorder also affects field-grown vegetable crops under certain environmental conditions.  Edema is often a cosmetic problem, but in […]

Root Rots in the Garden

Brian Hudelson, UW-Madison Plant Pathology and Laura Jull, UW-Madison Horticulture Revised:  5/20/2011 Item number:  XHT1072 What is root rot? Root rot is a general term that describes any disease where the pathogen (causal organism) attacks and leads to the deterioration of a plant’s root system.  Most plants are susceptible to root rots, including both woody […]

Early Blight

Brian Hudelson, UW-Madison Plant Pathology Revised:  3/10/2012 Item number:  XHT1074 What is early blight?  Early blight is one of two common fungal diseases that can devastate tomatoes in both commercial settings and home gardens.  Early blight can also be a serious disease on other popular vegetables including eggplants, peppers, and potatoes.  The second common tomato […]

Trellising, Staking and Caging – Vertical gardening techniques for vine-type vegetables

Robert Tomesh, horticulture specialist, University of Wisconsin Extension, Cooperative Extension Revised:  3/31/2011 Item number:  A3933-01 Vine-type fruits and vegetables—such as tomatoes, melons, and cucumbers—are some of the most popular produce grown. Various trellising, staking, and caging techniques can be used to enhance yield, minimize disease, and improve harvesting. Find out which techniques will work in […]

Onion Thrips

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 […]

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