Science Into Practice - Improving the efficiency of fungicides

Fungicides are vital for controlling leaf spots on brassicas. If fungicides are timed right, efficacy can be enhanced and the need for re-application reduced. However, optimal timing relies on accurate monitoring or prediction systems that identify when the damaging or vulnerable pathogen life cycle stages occur.

Well established models use environmental conditions and weather data to improve fungicide performance, but these have not been fully integrated with the activity of different active ingredients.

HDC project FV 313 looked at the effect of application time post-infection in combination with dosage and product type on the effectiveness of fungicide applications against dark leaf spot, ring spot and white blister. It enabled growers to reach more informed decisions on sprays.

Further information on the efficacy of protectant and eradicant fungicides could be added to the Brassicaspot forecasting system. This could then be referred to by users when crop protection inputs were required.

The results found that growers using the Brassicaspot infection models have up to seven days to apply either Plover or Folicur and still maintain effective disease control. The application interval of Generic Folicur is much longer (approximately 14 days), especially at mean temperatures of 5-10 degsC.

Dates for your diary

24 January HDC Parsnip Variety Trials Open Day, PGRO, Peterborough.

24 January HDC Optimising Pest & Disease Control Day, Chichester.

26 January HDC Optimising Pest & Disease Control Day, Beverley.

Horticultural Development Company

For details on all HDC activity, visit

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