Geostatistical analysis of the distribution of Leptosphaeria species causing phoma stem canker on winter oilseed rape (Brassica napus) in England

A - Papers appearing in refereed journals

Stonard, J. F., Marchant, B. P., Latunde-Dada, A. O., Liu, Z., Evans, N., Gladders, P., Eckert, M. R. and Fitt, B. D. L. 2010. Geostatistical analysis of the distribution of Leptosphaeria species causing phoma stem canker on winter oilseed rape (Brassica napus) in England. Plant Pathology. 59 (1), pp. 200-210.

AuthorsStonard, J. F., Marchant, B. P., Latunde-Dada, A. O., Liu, Z., Evans, N., Gladders, P., Eckert, M. R. and Fitt, B. D. L.
Abstract

In June/July 2001, 2002, 2003 and 2006, regional variation in distribution of the pathogens Leptosphaeria maculans and L. biglobosa that are causally associated with phoma stem canker was surveyed on winter oilseed rape crops in England. In 2001-2003, when isolates from basal cankers were visually identified as L. maculans or L. biglobosa based on cultural morphological characteristics, 70% were L. maculans and 30%L. biglobosa. In 2001, 2002, 2003 and 2006, when amounts of DNA of each species in basal cankers were determined by quantitative PCR, the abundance of L. maculans DNA was greater than that of L. biglobosa DNA in 77% of samples. When regional differences in amounts of L. maculans and L. biglobosa DNA were mapped geostatistically, quantities of L. maculans DNA were greater in cankers from southern England and those of L. biglobosa DNA were greater in northern England. A comparison with geostatistically mapped predictions made using a weather-based model describing stages in development of phoma stem canker epidemics suggested that these differences in Leptosphaeria populations may have been a consequence of differences in temperature after onset of leaf spotting between northern and southern England. Both PCR and morphological evidence suggested that the abundance of L. maculans in England has increased since the last surveys in the 1980s. Implications of these surveys for control of phoma stem canker are discussed.

KeywordsAgronomy; Plant Sciences
Year of Publication2010
JournalPlant Pathology
Journal citation59 (1), pp. 200-210
Digital Object Identifier (DOI)doi:10.1111/j.1365-3059.2009.02178.x
Open accessPublished as green open access
FunderHGCA - Home Grown Cereals Authority
Arable Group
Chadacre Agricultural Trust
Morley Agricultural Foundation
DuPont
Henry Lester Trust
Perry Foundation
Great Britain-China Educational Trust
China Scholarship Council
Biotechnology and Biological Sciences Research Council
DEFRA - Department for Environment, Food and Rural Affairs UK
British Society for Plant Pathology
Funder project or codePDM
BCC
Publisher's version
PublisherWiley
ISSN0032-0862

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