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Potato Diseases
Department of Plant Pathology
Washington State University

P.O. Box 646430
Pullman, WA

Dennis A. Johnson - Plant Pathologist
Phone# (509) 335-3753
Fax# (509) 335-9581
Email: dajohn@wsu.edu

Tom Cummings - Ag. Research Tech.
Phone# (509) 335-1998
Email: tfc@wsu.edu

Current late blight forecast and management recommendations





Late blight tuber rot, x-section

Late blight stem legion

Sporulation on late blight stem lesion

Late blight peeled tuber

Potato Late Blight in the Columbia Basin: An Economic Analysis of the 1995 Epidemic

Postinfection Activity Of Selected Late Blight Fungicides

Cost of Fungicides used to Manage Potato Late Blight in the Columbia Basin


Relative Resistance of Potato Clones in Response to New and Old Populations of Phytophthora infestans


Characterization of the phytophthora infestans Population in the Columbia Basin of Oregon and Washington from 1992 to 1995


Expansion of Potato Late Blight Forcasting Models for the Columbia Basin of Wahington and Oregon


Aggresiveness of Isolates of phytophthora infestans from the Columbia Basin of Washington and Oregon


Fungicide Application for Late Blight Management: A Boom attached to a Center Pivot Irrigation System


Competitive Fitness of Phytophthora infestans Isolates Under Semiarid Field Conditions


Vegatative Compatibility and Pathogenicity of Verticillium dahliae from Spearmint and Peppermint


Survival of detached sporangia of Phytophthora infestans exposed to ambient, relatively dry atmospheric conditions


Control of potato tuber rots caused by Oomycetes with foliar applications of Phosphorous Acid


Survival of Phytophthora infestans in Surface Water


Effects of Tuber Depth and Soil Moisture on Infection of Potato Tubers in Soil by Phytophthora infestans


Blight management for Columbia Basin

Late Season Management of Late Blight in Columbia Basin

Potato Late Blight: How long can sporangia survive?

Fungicide Application for Management of Potato Late Blight

Verticillium Wilt


Development of wilt in mint in response to infection by two pathotypes of Verticillium dahliae and co-infection by Pratylenchus penetrans


Postinfection activity of selceted potato late blight fungicides


Managing potato leaf roll


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Revised 3/07/06
If you have any questions or comments email dajohn@wsu.edu