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Focus on Potato


Practical Management of Powdery Scab
June 2011




By Robert D. Davidson, Ph.D.
Professor, Dept. of Horticulture
and Landscape Architecture
Colorado State University
Fort Collins, Colorado
Email: Robert.Davidson@colostate.edu


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Summary:

This presentation will aid consultants and growers in understanding how to identify powdery scab of potato and manage this disease using an integrated approach to control. Key symptoms used to identify the various stages of the disease will be described and contrasted with other similar problems. Details of the pathogen, host, disease cycle, and environmental factors affecting symptom development, will be discussed. Much attention will be given to management options for this disease including avoiding the disease, measuring the inoculum load in soil, making the appropriate cultivar selections based upon the field history, resistance of a given cultivar, inoculum levels, and environment, and utilizing specific chemical control when warranted. Understanding the full integration of several different strategies for the producer are key to managing this potentially devastating and hard to control disease.


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