Population Dynamics of Streptomyces Scabies and Other Actinomycetes As Related to Common Scab of Potato
1985. A model relating the probability of foliar disease incidence dispersion. Phytopathology 76:446-450. to the population frequencies of bacterial plant pathogens. 41. Snedecor, G. W., and Cochran, W. G. 1980. Statistical Methods. Phytopathology 75:505-509. 7th ed. The Iowa State University Press, Ames, IA. 507 pp. 39. Schaad, N. W. 1988. Laboratory Guide for Identification of Plant 42. Thal, W. M., and Campbell, C. L. 1986. Spatial pattern analysis Pathogenic Bacteria. 2nd ed. American Phytopathological Society, of disease severity data for alfalfa leaf spot caused primarily by St. Paul, MN. 164 pp. Leptosphaerulinabriosiana. Phytopathology 76:190-194. 40. Schuh, W., Frederiksen, R. A., and Jeger, M. J. 1986. Analysis of 43. Upton, G. J. G., and Fingleton, B. 1985. Spatial Data Analysis by spatial patterns in sorghum downy mildew with Morisita's index of Example. John Wiley & Sons, New York. 410 pp. Ecology and Epidemiology Population Dynamics of Streptomyces scabies and Other Actinomycetes as Related to Common Scab of Potato A. P. Keinath and R. Loria Department of Plant Pathology, Cornell University, Ithaca, NY 14853-5908. Present address of first author: Biocontrol of Plant Diseases Laboratory, Plant Science Institute, Beltsville Agricultural Research Center-West, Beltsville, MD 20705. We gratefully acknowledge statistical advice from M. P. Meredith, Biometrics Unit, Cornell University, and technical assistance from Ellen Wells and Joanne Wilde. Accepted for publication 8 February 1989 (submitted for electronic processing). ABSTRACT Keinath, A. P., and Loria, R. 1989. Population dynamics of Streptomyces scabies and other actinomycetes as related to common scab of potato. Phytopathology 79:681-687. Effects of two potato cultivars on population dynamics of Streptomyces on tuber surfaces generally increased during each growing season, but scabies, causal agent of common potato scab, and other actinomycetes populations in fallow soil remained constant or decreased.
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