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The effect of a few days of rain on the distribution of common scab (Streptomyces scabies) on young potato tubers
Author(s) -
LAPWOOD D. H.,
ADAMS M. J.
Publication year - 1973
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1973.tb00934.x
Subject(s) - stolon , plant stem , biology , common scab , horticulture , botany , agronomy , streptomyces , bacteria , genetics
SUMMARY At Woburn, Beds, in 1967, potato tubers formed and grew in dry soil except after rain between 23 and 26 June. At lifting, Majestic tubers were severely and uniformly scabbed, except for distinct bands free from lesions. The position of the bands differed depending on the date when tubers started to form; they were further from the stolon attachment when tubers formed early and nearer it when tubers formed late. Samples taken in June and July showed that the scab‐free band and the late June rain were related. From 25 June to 1 July the soil was probably wet enough to prevent Streptomyces scabies infection, but only one or two tuber internodes remained free from infection; they were the internodes that began to expand about a week before the rain. Internodes that formed while the soil was wet became scabbed, showing they were still susceptible to S. scabies after the soil had dried again. Recent work on lenticel formation has suggested a hypothesis to explain these results.