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Testing the resistance of potato varieties to common scab



Testing the resistance of potato varieties to common scab



Potato Research 23(1): 33-48



Resistance to common scab was tested by growing potatoes in dry sand or soil in 31 pots placed on irrigated subsoil. Inoculated coarse sand (0.5-0.005 Petri dish culture of Streptomyces scabies per pot) proved more reliable than naturally infested soil. The incidence of scab on the seed tubers did not significantly affect the results. Tests in the greenhouse were most reliable, although those in open air also often gave satisfactory results. For screening purposes satisfactory results can be obtained by using only 2 or 3 pots/variety. Thirty-six tyrosinase positive isolates of Streptomyces from potato and carrot from different parts of Norway were tested on 4 potato varieties and some of the isolates were tested on carrot. Large differences in aggressiveness were found, but no difference in virulence could be demonstrated, i.e., the same varieties were the most resistant to all isolates.

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Accession: 000998153

Download citation: RISBibTeXText

DOI: 10.1007/bf02364024



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