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.

QoI Guidelines: Vines 

(no changes in update Jan. 2017 compared to previous recommendations)

Apply a maximum of 4 QoI fungicide containing sprays against any disease per vine crop, and a maximum of 33% of the total number of applications.

Powdery mildew (Uncinula necator / Erysiphe necator)

  1. Apply QoI fungicides according to manufacturer's recommendations for the target disease at the specific crop growth stage indicated. Effective disease management is a critical parameter in delaying the build-up of resistant pathogen populations.
  2. Apply a maximum of 2 QoI fungicide containing sprays targeted against powdery mildew per vine crop, preferably in mixture (co-formulations or tank mixes) with effective mixture partners from different cross-resistance groups.
  3. Apply QoI fungicides preventively.
  4. QoI fungicides used solo should be used in strict alternation with fungicides from a different cross-resistance group. 
  5. Apply QoI fungicides used in mixture in a maximum of two consecutive applications in alternation with fungicides from a different cross-resistance group. In areas where resistance has been confirmed, apply QoI fungicides in strict alternation and in mixture with an effective partner.

Downy mildew (Plasmopara viticola)

  1. Apply QoI fungicides according to manufacturer's recommendations for the target disease at the specific crop growth stage indicated. Effective disease management is a critical parameter in delaying the build-up of resistant pathogen populations.
  2. Apply QoI fungicides preventively.
  3. Apply a maximum of 3 QoI fungicide containing sprays targeted against downy mildew per vine crop, only in mixture with effective partners from different cross-resistance groups.
  4. Apply QoI fungicides in single or block application in alternation with fungicides from a different cross-resistance group.

QoI Guidelines: Pome fruit

Scab (Venturia inaequalis, Venturia pirina)

  1. Apply QoI fungicides according to manufacturer’s recommendations for the target disease (or complex) at the specific crop growth stage indicated and adapted to size of trees. Effective disease management is a critical parameter in delaying the build-up of resistant pathogen populations.
  2. QoI fungicides must be applied only in mixture with partners contributing to the effective control of the target pathogens.
  3. Apply QoI fungicides preventatively. Under high disease pressure the spray interval should not exceed 7-10 days.
  4. Apply a maximum of 3 QoI containing sprays per crop. A maximum of 4 QoI fungicide applications may be used where 12 or more applications are made per crop.
  5. A maximum of 2 consecutive QoI fungicide sprays is preferred. Where field performance was adversely affected apply QoI containing fungicides in mixtures in strict alternation with fungicides from a different cross-resistance group.

For a printer friendly version of these use recommendations see section 2.2.2.2 and 2.2.2.3 pp. 14-15 of Minutes of the 2016 QoI Meeting, Recommendations for 2017.

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Helge Sierotzki
Interim Chair

Syngenta Crop Protection Münchwilen AG 
WST540.1.94 
CH-4332 Stein

Tel : +41 62 866 01 80 
Fax: +41 62 866 07 63

E-Mail: Helge Sierotzki