Effects of fungicides on in vitro spore germination and mycelial growth of the phytopathogens Leptosphaeria maculans and L. biglobosa (phoma stem canker of oilseed rape)

A - Papers appearing in refereed journals

Eckert, M. R., Rossall, S., Selley, A. and Fitt, B. D. L. 2010. Effects of fungicides on in vitro spore germination and mycelial growth of the phytopathogens Leptosphaeria maculans and L. biglobosa (phoma stem canker of oilseed rape). Pest Management Science. 66 (4), pp. 396-405.

AuthorsEckert, M. R., Rossall, S., Selley, A. and Fitt, B. D. L.
Abstract

BACKGROUND: Phoma stem canker, caused by the coexisting related fungal pathogens Leptosphaeria maculans (Des.) Ces. & de Not and L. biglobosa Shoemaker & H Brun, is a major disease of winter oilseed rape in the UK. Annually, over 90% of UK crops receive at least one foliar application of fungicide, but little is known about the sensitivity of the more damaging L. maculans and the less damaging L. biglobosa to these fungicides. The effects of flusilazole, tebuconazole and Methyl Benzimidazole Carbamate (MBC) fungicides (benomyl and carbendazim) on the germination of ascospores, conidia and germ tube growth of both species were examined. Isolates collected from different oilseed rape crops in England and Wales were assessed for their mycelial growth on fungicide-amended medium, and ED(50) values were calculated. RESULTS: Leptosphaeria maculans and L. biglobosa differed in their sensitivity to fungicides. Conidial germination of L. maculans was more sensitive to these fungicides than that of L. biglobosa. Isolates of L. maculans had smaller ED(50) values for mycelial growth for all fungicides tested than isolates of L. biglobosa. CONCLUSION:These results suggest that fungicide applications might affect the structure of L. maculans/L. biglobosa populations in UK winter oilseed rape crops. (C) 2009 Society of Chemical Industry

KeywordsAgronomy; Entomology
Year of Publication2010
JournalPest Management Science
Journal citation66 (4), pp. 396-405
Digital Object Identifier (DOI)doi:10.1002/ps.1890
PubMed ID20013877
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
DuPont
Funder project or codePDM
Output statusPublished
PublisherWiley
ISSN1526-498X

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