Effects of fungicide on growth of Leptosphaeria maculans and L. biglobosa in relation to development of phoma stem canker on oilseed rape (Brassica napus)

A - Papers appearing in refereed journals

Huang, Y. J., Hood, J. R., Eckert, M. R., Stonard, J. F., Cools, H. J., King, G. J., Rossall, S., Ashworth, M. and Fitt, B. D. L. 2011. Effects of fungicide on growth of Leptosphaeria maculans and L. biglobosa in relation to development of phoma stem canker on oilseed rape (Brassica napus). Plant Pathology. 60 (4), pp. 607-620.

AuthorsHuang, Y. J., Hood, J. R., Eckert, M. R., Stonard, J. F., Cools, H. J., King, G. J., Rossall, S., Ashworth, M. and Fitt, B. D. L.
Abstract

Controlled-environment and field experiments were done to investigate effects of the fungicide Punch C (flusilazole plus carbendazim) on growth of Leptosphaeria maculans and L. biglobosa in oilseed rape. In controlled-environment experiments, for plants inoculated with L. maculans, fungicide treatment decreased lesion size and amount of L. maculans DNA in leaves; for plants inoculated with L. biglobosa, fungicide did not affect lesion size or amount of pathogen DNA. When release of ascospores was monitored using a Burkard spore sampler, the timing and pattern of ascospore release differed between the four seasons. In 2006/2007, the majority of ascospores released were L. maculans, whilst in 2007/2008 the majority were L. biglobosa; in both seasons L. maculans ascospores were released before L. biglobosa ascospores. In field experiments in 2002/2003 and 2003/2004, fungicide treatment decreased severity of stem canker on cv. Apex, but gave no significant yield response. In 2006/2007 and 2007/2008, fungicide treatment decreased phoma leaf spot incidence in autumn and stem canker severity at harvest, and increased yield. Fungicide treatment decreased stem canker severity more on cv. Courage, with a good yield response, than on cv. Canberra. In 2002/2003 and 2003/2004, fungicide treatment decreased the frequency of spread of L. maculans into stem pith tissues and in 2006/2007 fungicide decreased the amount of L. maculans DNA in stem tissues (measured by quantitative PCR). These results are used to suggest how effects of fungicides on interactions between L. maculans and L. biglobosa might affect severity of phoma stem canker and yield response.

KeywordsAgronomy; Plant Sciences
Year of Publication2011
JournalPlant Pathology
Journal citation60 (4), pp. 607-620
Digital Object Identifier (DOI)doi:10.1111/j.1365-3059.2010.02416.x
Open accessPublished as green open access
FunderDEFRA - Department for Environment, Food and Rural Affairs UK
DuPont
HGCA - Home Grown Cereals Authority
Chadacre Agricultural Trust
Biotechnology and Biological Sciences Research Council
Funder project or codePDM
Publisher's version
PublisherWiley
Grant IDBB/E001610/1
ISSN0032-0862

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