Tobacco Rattle

Rachel Zwieg* and Brian Hudelson, UW-Madison Plant Pathology *Completed as partial fulfillment of the requirements for the Horticulture track of the Farm and Industry Short Course program at the University of Wisconsin Madison. Revised:  8/19/2010 Item number:  XHT1180 What is tobacco rattle? Tobacco rattle is a common and potentially serious viral disease that affects a […]

Downy Mildew

Jim Olis* and Brian Hudelson, UW-Madison Plant Pathology *Completed as partial fulfillment of the requirements for a BS in Plant Pathology at the University of Wisconsin Madison. Revised:  8/6/2012 Item number:  XHT1077 What is downy mildew? The downy mildews are a group of fungal diseases that cause destruction of the leaves, stems, flowers and fruits […]

Slugs

Phil Pellitteri, UW Insect Diagnostic Lab Revised:  5/25/2010 Item number:  XHT1040 Slugs are legless, soft-bodied creatures that resemble snails without a shell.  Slugs feed on a wide range of plants including ornamentals, vegetables and fruits.  A number of species of slugs are found in Wisconsin, but gray and spotted garden slugs are the most common, […]

Impatiens Necrotic Spot

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  5/11/2010 Item number:  XHT1139 What is impatiens necrotic spot?  Impatiens necrotic spot is a viral disease that causes considerable losses to greenhouse-grown ornamentals and, to a lesser extent, vegetable crops.  In Southern states, impatiens necrotic spot can also be a problem on field crops.  Ornamental crops […]

Herbicide Damage

Brian Hudelson, UW-Madison Plant Pathology Revised:  5/11/2010 Item number:  XHT1004 What is herbicide damage?  Herbicide damage is any adverse, undesired effect on a plant that is caused by exposure of that plant to a pesticide designed for weed control (i.e., a herbicide).  Any plant can be subject to this problem.   What does herbicide damage […]

Gray Mold (Botrytis Blight)

Jeffory Schraufnagel*, Milwaukee Area Technical College, Brian Hudelson, UW-Madison Plant Pathology Revised:  5/11/2010 Item number:  XHT1122 What is gray mold?  Gray mold (or Botrytis blight) is a common and often serious fungal disease that can affect plants of all kinds.  Gray mold is a particularly serious problem on flowering plants and those plants grown in […]

Chlorosis

Brian Hudelson, UW-Madison Plant Pathology, UW-Extension Revised:  1/8/2012 Item number:  XHT1002 What is chlorosis?  Chlorosis is a common nutritional disorder of many woody ornamentals in Wisconsin, particularly in the southern and eastern parts of the state.  Pin oaks are most commonly affected by chlorosis, although many other trees and shrubs (e.g., white oak, red maple, […]

Black Walnut Toxicity

Ann Joy and Brian Hudelson, UW-Madison Plant Pathology Revised:  5/7/2010 Item number:  XHT1017 What is black walnut toxicity? Black walnut trees (Juglans nigra) produce a toxic substance (called juglone) that prevents many plants from growing under or near them. Related trees like butternut (J. cinerea) and shagbark hickory (Carya ovata) also produce juglone, but in […]

Aster Yellows

Brian Hudelson, UW-Madison Plant Pathology Revised:  5/6/2010 Item number:  XHT1080 What is aster yellows? Aster yellows is a chronic, systemic disease that affects over 300 species in 38 families of broad-leaf, herbaceous plants. Members of the aster family (Asteraceae), such as asters, marigolds, Coreopsis and purple coneflower are commonly affected by this disease. Vegetable crops […]

Damping Off

Brian Hudelson, UW-Madison Plant Pathology Revised:  4/25/2004 Item number:  XHT1124 What is damping-off?  Damping-off is a common and fatal disease that affects all types of plant seedlings.  The disease is most prevalent when seeds are germinated in cool, wet soils.  Fortunately, seedlings are susceptible to damping-off for only a short period following emergence and eventually […]

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