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The occurrence of Altemaria brassicicola, Altemaria brassicae and Leptosphaeria maculans in brassica seed crops in south‐east England between 1976 and 1980
Author(s) -
HUMPHERSONJONES F. M.
Publication year - 1983
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1983.tb01298.x
Subject(s) - leptosphaeria maculans , biology , brassica , alternaria brassicicola , brassica oleracea , alternaria brassicae , agronomy , rapeseed , blackleg , botany , biochemistry , arabidopsis , gene , mutant
Surveys of brassica seed crops in Essex and Suffolk showed that Alternaria spp. occurred in many crops of Brassica oleracea in the years 1977–1980 affecting up to 100% of pods in each year. A. brassicicola was the only species present in 1976 and was the domioant pathogen in succeeding years but A. brassicae increased in frequency from 1977, causing 24% of the pod infections on B. oleracea in 1980. The latter fungus was the dominant species in crops of oilseed rape ( B. napus ), the mean incidence of infected pods increasing from 0.5% in 1977 to 2.9% in 1980. Leptosphaeria maculans was not found in horticultural brassica seed crops in 1976 but occurred abundantly in these crops and in oilseed rape crops in each of the following years.