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Cabbage root fly forecasts

The forecast outputs below are based on weather data collected by Plantsystems Limited and funded by Syngenta. The forecasts predict the timing of fly activity. They do not predict the number of insects present in the crop, as this depends on the size of the local fly population. For control purposes, we consider that the pest has become active when 10% of the insects have emerged/laid eggs and that the peak of activity has occurred when 50% have emerged/laid eggs. The predictions will change over time depending on weather conditions.

Updated 16 May 2022



First generation

Forecast 10% EGG-LAYING in 2022

First generation

Forecast 50% EGG-LAYING in 2022

Cornwall (Newquay)

27 Mar 23 Apr

Kent (Canterbury)

17 Apr 9 May

Suffolk (Woodbridge)

13 Apr 7 May

Wellesbourne (Warwick)

17 Apr 8 May

Norfolk (Norwich)

19 Apr 9 May

South Lincolnshire (Boston)

23 Apr 11 May

Nottingham (Bilsthorpe)

3 May 19 May

Lancashire (Ormskirk)

19 Apr 9 May

York (Market Weighton)

5 May 20 May

Scotland (Blairgowrie)

25 May 5 June