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
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
Epidemiology and Management of Field Crop Diseases