Leptosphaeria maculans, L. biglobosa and fungicides: preliminary results from in vitro and field observations

M. R. Eckert, Bruce Fitt, Andrew Selley

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The sensitivity of L maculans and L. biglobosa to fungicides commonly used on UK winter
oilseed rape was investigated in vitro. On medium containing flusilazole or tebuconazole, the radius of
mycelial growth of isolates was recorded, and the effective dose at which 50% of growth was inhibited
(ED50) determined. Isolates of L. maculans had lower ED50 values, and the range of L. maculans ED50
values was narrower for both flusilazole (ED50 0.27µg/ml, range 0.06-0.7µg/ml) and tebuconazole
(ED50 0.67µg/ml, range 0.4-0.94µg/ml) than for isolates of L. biglobosa (flusilazole ED50 0.34µg/ml, range 0.16-0.9µg/ml; tebuconazole ED50 1.45µg/ml, range 0.75-2.63µg/ml). The effects of fungicide
on pathogen populations were investigated in a winter oilseed rape experiment in 2002/2003. The early fungicide treatment apparently affected pathogen populations, since fewer L. biglobosa isolates were detected on basal and upper stems from early treated plots than on stems from untreated and late
treated plots.
Original languageEnglish
Title of host publicationInternational Organisation for Biological Control Bulletin
EditorsBirger Koopermanns, Neal Evans, Samantha Cook, Ingrid H. Williams
Place of PublicationUK
PublisherInternational Organisation of Biological Control
ISBN (Print) 92-9067-172-4
Publication statusPublished - 30 Mar 2004
EventIOBC-WPRS Working Group: Integrated Control in Oilseed Crops - Rothamsted, United Kingdom
Duration: 30 Mar 200431 Mar 2004


WorkshopIOBC-WPRS Working Group: Integrated Control in Oilseed Crops
Country/TerritoryUnited Kingdom


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