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 the annual meeting of the WG.

SDHI Guidelines: Grapes

(Updated in Aug. 2017, no changes)

  • Apply SDHI fungicides according to manufacturers’ recommendations.
  • When mixtures are used for SDHI fungicide resistance management, applied as tank mix or as a co-formulated mixture, 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 max. of 3 SDHI-containing fungicides per year over all diseases, solo or in mixture with effective mixture partners from different cross-resistance groups but not more than 50% of the total number of applications.
  • A maximum of 4 SDHI fungicide applications may be used where 12 or more fungicide applications are made per crop.
  • If used solo, apply SDHI fungicides in strict alternation with fungicides from a different cross-resistance group.
  • If used in mixture, apply SDHI fungicides in a maximum of 2 consecutive applications.
  • Apply SDHI fungicides preventively.

For SDHI fungicide applications specifically targeted against grey mold, Botrytis cinerea, refer to the table below:

Total number of Botrytis cinerea spray applications per crop 1 2 3 4 5 6 >6
Maximum recommended Solo SDHI fungicide spray (apply in strict alternation) 1 1 1 2 2 2 3
Max. recommended SDHI fungicide sprays in mixture (apply a max. of 2 consecutive applications) 1 1 2 2 2 3 3

SDHI Guidelines: Pomefruit

(Updated in Aug. 2017, no changes)

  • Apply SDHI fungicides according to manufacturers’ recommendations.
  • When mixtures are used for SDHI fungicide resistance management, applied as tank mix or as a co-formulated mixture, the mixture partner:
    • should provide satisfactory disease control when used alone on the target disease
    • must have a different mode of action.
  • Apply SDHI fungicides using not more than 2 consecutive applications.
  • Apply SDHI fungicides preventively.

The following spray table shall be used as a guideline irrespective of the targeted disease in pomefruits.

Total number of spray applications per crop 1 2 3 4 5 6 7 8 9 10 11 12 >12
Maximum recommended Solo SDHI fungicide sprays 1 1 1 1 2 2 2 2 2 3 3 3 3
Max. recommended SDHI fungicide sprays in mixture 1 1 2 2 2 3 3 3 3 3 3 4 4

SDHI Guidelines – Stone fruits

(Updated in Aug. 2017, no changes)

  • Apply SDHI fungicides according to manufacturers’ recommendations.
  • When mixtures are used for SDHI fungicide resistance management, applied as tank mix or as a co-formulated mixture, the mixture partner and should provide satisfactory disease control when used alone on the target disease and must have a different mode of action.
  • Apply a max. of 3 SDHI-containing fungicides per year over all diseases, solo or in mixture with effective mixture partners.
  • If used solo, apply SDHI fungicides in strict alternation with fungicides from a different cross-resistance group.
  • If used in mixture, apply SDHI fungicides in a maximum of 2 consecutive applications.
  • Apply SDHI fungicides preventively.

SDHI Guidelines – Other multi-spray crops (e.g. vegetables, small berries and strawberries)

(Updated in Aug. 2017, no changes)

  • When mixtures are used for SDHI fungicide resistance management, applied as tank mix or as a co-formulated mixture, the mixture partner should provide satisfactory disease control when used alone on the target disease and must have a different mode of action.

The following spray table shall be used as a guideline irrespective of the targeted disease in the crops specified above.

Total number of spray applications per crop 1 2 3 4 5 6 7 8 9 10 11 12 >12
Maximum recommended Solo SDHI fungicide sprays (apply in strict alternation) 1 1 1 1 2 2 2 3 3 3 3 4 *
Max. recommended SDHI fungicide sprays in mixture (apply a mac. of 2 consecutive applications) 1 1 1 2 2 3 3 3 3 3 4 4 *
*When more than 12 fungicide applications are made, observe the following guidelines:

  • When using a SDHI fungicide as a solo product, the number of applications should be no more than 1/3 (33%) of the total number of fungicide applications per season.
  • For programs in which tank mixes or pre-mixes of SDHI fungicides are utilized, the number of SDHI-containing applications should be no more than 1/2 (50%) of the total number of fungicide application per season.
  • In programs where SDHIs are made with both solo products and mixtures, the number of SDHI containing applications should be no more than 1/2 (50%) of the total no. of fungicides applied per season.
  • If used solo, apply SDHI fungicides in strict alternation with fungicides from a different cross-resistance group.
  • If used in mixture, apply SDHI fungicides in a maximum of 2 consecutive applications.

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Dr. Kristin Klappach
Chair

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

Tel: +49 62160- 27287
Fax: +49 62160- 6627287
kristin.klappach@basf.com