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Kenneth B. JohnsonProfessor,
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Plant disease epidemiology with emphasis on disease ecology and integrated management strategies.
My research is concerned with understanding how variability in environment and in host and pathogen populations affects the development of plant disease. Results of these studies are used to develop and evaluate integrated disease control strategies. Recently, we have worked on integrating biological control methods into management of fire blight of pear and apple, and on development and evaluation of models that predict the effectiveness of biological control of plant disease.
Teresa Sawyer
Todd Temple
BOT 350 INTRODUCTION TO PLANT PATHOLOGY
BOT 552 PLANT DISEASE MANAGEMENT
BOT 550 PLANT PATHOLOGY
Temple , T. N., Stockwell, V. O., Pusey, P. L., and Johnson, K. B. 2007. Evaluation of likelihood of co-occurrence of Erwinia amylovora with mature fruit of winter pear. Phytopathology 97:1263-1273.
Heffer-Link, V., and Johnson . K.B. 2007. White mold. On-line Lessons in Plant Pathology series. The Plant Health Instructor . DOI: 10.1094/PHI-I-2007-0809-01 http://www.apsnet.org
Johnson, K.B., Sawyer, T. L., and T. N. Temple. 2006. Rates of epiphytic growth of Erwinia amylovora on flowers common in the landscape. Plant Dis. 90:1331-1336.
Heffer, V., Powelson, M.L., Johnson. K.B., and Shishkoff, N. 2006. Identification of powdery mildew fungi, anno 2006. Laboratory Exercises in Plant Pathology series. The Plant Health Instructor . DOI: 10.1094/PHI-I-2006-0706-01. www.apsnet.org/education/LabExercises/PowderyMildew/Top.html
Temple, T.N., Stockwell, V., Loper, J.E. and Johnson, K.B. 2004. Bioavailability of iron to Pseudomonas fluorescens A506 on flowers of pear and apple. Phytopathology 94: 1286-1294.
Johnson, K. B., Stockwell, V. O. and Sawyer, T. L. 2004. Adaptation of fire blight forecasting to optimize the use of biological controls. Plant Disease 88:41-48.
Stockwell, V.O., Johnson, K.B, Sugar, D., and Loper, J.E. 2002. Antibiosis contributes to biological control of fire blight by Pantoea agglomerans strain Eh 252 in the field. Phytopathology 92: 1202-1209.
Glass, J.R., Johnson, K.B., and Powelson, M.L. 2001. Assessment of barriers to prevent the development of potato tuber blight caused by Phytophthora infestans. Plant Dis. 85:521-528.
Pinkerton, J.N, Johnson, K.B., Aylor, D.E., and Stone, J.K. 2001. Spatial and temporal increase of eastern filbert blight in European hazelnut orchards in the Pacific Northwest. Phytopathology 91:1214-1223.
Johnson, K.B. and Stockwell, V.O. 2000. Biological control. Pages 319-337 in: Fire Blight: The Disease and Its Causative Agent, Erwinia amylovora, Vanneste, J.L. (ed.). CAB International, London.
Johnson, K.B., Stockwell, V.O., and Sugar, D. 2000. Assessment of environmental factors influencing growth and spread of Pantoea agglomerans on and among blossoms of apple and pear. Phytopathology 90:1285-1294.
Johnson, K.B. 1999. Dose-response relationships for biocontrol of plant disease and their use to define pathogen refuge size. Pages 385 -392 in: Theoretical Approaches to Biological Control, Hawkins, B.A. (ed.). Chapman & Hall, New York.
