These recommendations are crop (and disease) specific recommendations which should be used in ADDITION to the general use recommendations to manage resistance development. These are excerpted from the minutes of annual meeting of the WG.

SDHI Guidelines – Cereals

(Updated in Aug. 2017, no changes)

Foliar applications

  • Apply SDHI fungicides always in mixtures
  • The mixture partner should provide satisfactory disease control when used alone on the target disease and must have a different mode of action.
  • Apply a maximum of 2 SDHI fungicide containing sprays per cereal crop.
  • Apply the SDHI fungicide preventively or as early as possible in the disease cycle. Do not rely only on the curative potential of SDHI fungicides. 
  • Strongly reduced rate programs including multiple applications must not be used. Refer to manufacturers’ recommendations for rates.

Seed treatment applications


SDHIs are and will be used as seed treatment products.  It is FRAC’s objective to protect this fungicide group and integrate all uses into technical recommendations. These recommendations contain a recommendation on seed treatments, including those which have efficacy on foliar pathogens.  These recommendations will be reviewed regularly and supported by monitoring.

  • When an SDHI fungicide is used as a seed treatment on cereals, there should be no implications regarding SDHI FRAC guidelines on the use of foliar SDHI fungicides on the same crop as long as the SDHI seed treatment is directed by rate and efficacy against seed and soil borne diseases or ‘low risk’ foliar pathogens as defined in the FRAC Pathogen Risk List.

  • SDHIs used as a seed treatment in cereals providing foliar efficacy against pathogens with moderate/ high resistance risk count against the total number of SDHI applications.

Soybeans

(Updated in Aug. 2017, changes in bold)

Species can carry different mutations which affect SDHIs. A few mutations can lead to different sensitivities depending on the chemical structure of the active ingredient.
As all SDHIs are cross-resistant, resistance management must be the same for all SDHIs.  All monitoring and guideline related statements refer to the entire group of SDHIs.


  • Apply SDHI fungicides always in mixtures

  • The mixture partner:

    • should provide satisfactory disease control when used alone on the target disease

    • must have a different mode of action

    • The use of additional, non-cross-resistant modes of action should also be considered (ready-mixtures and tank-mixtures where legally possible)

  • Apply a maximum of 2 SDHI fungicide containing sprays per soybean crop (no soy after soy/ double cropping)

  • Apply the SDHI fungicide preventively or as early as possible in the disease cycle. Do not rely only on the curative properties of SDHIs, or SDHI-containing mixtures

  • Strongly reduced rate programs including multiple applications must not be used. Refer to manufacturers’ recommendations for rates

Good agricultural practices must be considered to reduce source of inoculum, disease pressure and resistance risk, e.g. no multiple cropping, implement and respect soybean-free periods, consider partially resistant soybean varieties, reduce the planting window, give preference to early-cycle varieties and endorse the destruction of volunteers.

NEWS

Contact

Dr. Kristin Klappach
Chair

BASF SE
Agricultural Research Station Limburgerhof
D-67114 Limburgerhof,
Germany

Tel: +49 62160- 27287 Fax: +49 62160- 6627287

E-Mail: Dr. K. Klappach