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Light Leaf Spot spotted at Newark Innovation Centre

Innovation Centres
23.02.2017
North
LLS in OSR at Newark

Location – Newark Innovation Centre

Variety – Incentive

Date – 22.02.2016

 

We're seeing the first signs of both Light Leaf Spot and Phoma in our oilseed rape fungicide trials at Newark, with low levels in both treated and untreated plots. 

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.

This particular field received an application in November, and will receive a second prothioconazole-based treatment in the next week or so when conditions are safe to travel.

Tom Clark