Summary
The presence of the late blight disease of potatoes in Canada is discussed and factors are mentioned which affect the prevalence of this disease.
Surveys conducted in the period 1954–1956 yielded 1127 isolates ofP. infestans which may be grouped into 14 races occurring in nine provinces.
The greatest number and the most complex races ofP. infestans have been found in Eastern Canada and the least number in this regard in the Prairie Provinces.
The common race of the late blight fungus found appears to be race (4). Race (1,4) is also widely distributed.
It has been shown that the international genotypes cannot always be relied upon to register in one determination the correct race, and certain races often behaved in an erratic way on specific genotypes.
The basic value of surveying for races ofP. infestans is stressed.
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Literature Cited
Black, W., C. Mastenbroek, W. R. Mills and L. C. Peterson. 1953. A proposal for an international nomenclature of races ofPhytophthora infestans and of genes controlling immunity inSolanum demissum derivatives. Euphytica 2: 173–178.
Graham, K. M. 1955. Distribution of physiological races ofPhytophthora infestans (Mont.) de Bary in Canada. Amer. Potato Jour. 32: 277–282.
Howatt, J. L. and P. N. Grainger. 1955, Some new findings concerningPhytophthora infestans (Mont.) de Bary. Amer Potato Jour. 32: 180–188.
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Contribution No. 1598 from the Botany and Plant Pathology Division, Science Service, Canada Department of Agriculture, Ottawa, Ont.
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Howatt, J.L. The late blight disease of potatoes and its causal fungus in Canada. American Potato Journal 34, 185–192 (1957). https://doi.org/10.1007/BF02854946
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DOI: https://doi.org/10.1007/BF02854946