Edema (masses of plant cells often produced on the undersides of leaves) is common on plants when they are overwatered under conditions of high humidity.
The ergot pathogen produces survival structures called sclerotia that can germinate to form mushroom-like structures. These structures produce spores that can infect important grain crops like wheat, barley and rye.
Yellowing between the veins of oak leaves (called chlorosis) is typically caused by a lack of iron in trees that are grown in sites where the soil pH is over high. This is a common occurrence in Wisconsin.
Heterosporium is a fungal leaf pathogen that can cause leaf spots on iris and (in the example in this photo) on ash.
One symptom of an infection by odontoglossum ringspot virus on orchids can be necrotic (i.e., dead) streaks in flowers.
Many rust pathogens (such as the one that causes the common corn rust shown in this photo) produce masses of orange to rusty-brown spores that can be easily wiped from the leaf surface.
Powdery mildew is a common disease the leaves of many indoor and outdoor plants. On African violet, the disease more commonly occurs on flowers.
Flourine gas is often produced as a by-product of the manufacture of glass. It can build up to high concentrations in leaves and lead to tissue death.
Growth distortions and greening of flowers associated with an aster yellows phytoplasma infection of gladiolus.
Brooke Weber prepares soil for an alfalfa Aphanaomyces euteiches race test.

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Faculty Profile

Molecular mechanisms of viral replication, host interactions and oncogenesis
Biology of plant pathogenic bacteria, tropical plant pathology
Biology of human bacterial pathogens in association with plants
Plant responses to pathogens; molecular basis of plant disease resistance.
Control of pathogens important for seed potato production and certification
The development of and use of statistical tools to address complex problems in the agricultural, environmental and biological sciences, focusing especially on spatial statistics.
Diagnosis, biology, and management of fungal and other pathogens of potato and vegetable crops in Wisconsin
Mycology - necrotrophic fungal pathogenesis
Urban Ecology and Turfgrass Management
Nematology - Population ecology of nematodes with emphasis on nematode pests of agricultural crops and nematode-fungus interactions causing plant diseases.
Etiology and integrated management of diseases of fruit crops
Plant virology - viral translation control, viral replication, and plant virus resistance
Plant disease ecology and epidemiology
Organic fruit, vegetable, and field crops production
Epidemiology and Management of Field Crop Diseases