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Plenty of Light Leaf Spot in rape crops

Innovation Centres
LLS on OSR at Hampshire IC
LLS on OSR at Hampshire IC

Light leaf spot is still being found at our Innovation Centres in Newark, Rougham and Hampshire, particularly on Charger.

Disease spores remain on rape stubbles and are dispersed by wind into emerging oilseed rape crops in the autumn. Light leaf spot (Pyrenopeziza brassicae) symptoms rarely seen until late autumn/early winter. Secondary spread of light leaf spot by splash-dispersed spores takes place throughout the year which may be seen later in the season. Where light leaf spot occurs regularly, an autumn fungicide is applied in November or early December. A second spray may be required in spring if light leaf spot pressure remains high.

Our trials are showing that, in the field, the combination of continued good varietal resistance and a robust fungicide strategy can successfully mitigate the impact of Light Leaf Spot, even in high pressure situations. Triazoles continue to have good activity on LLS with prothioconazole continuing to be the leading active ingredient for control.

Southern Technical Trialist