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: Potato and Tomato

(updated Feb. 2018, no changes from 2017 recommendations)

Late blight (Phytophthora infestans

  1. Apply QoI fungicides according to manufacturer's recommendations for the target disease (or complex) at the specific crop growth stage indicated. Effective disease management is a critical parameter in delaying the build-up of resistant pathogen populations.
  2. Where QoI fungicide products are applied alone do not exceed 1 spray out of 3 with a maximum of 3 sprays per crop. Do not use more than 2 consecutive applications.
  3. Where QoI fungicide products are applied in mixtures (co-formulations or tank mixes) do not exceed 50% of the total number of sprays or a maximum of 6 QoI fungicide applications whichever is the lower. Do not use more than 3 consecutive QoI fungicide containing sprays.
Early blight (Alternaria solani, Alternaria alternata)

  1. Where QoI fungicide products are applied solo do not exceed 33% of the total number of sprays or a maximum of 4. Where mixtures (co-formulations or tank mixes) are used do not exceed 50% of the total number of sprays or a maximum of 6 QoI fungicide applications, whichever is the lower.
  2. Where resistance has been confirmed, QoI fungicides must be applied only in mixture with partners contributing to the effective control of the target pathogens.

QoI Guidelines: Soybeans

(updated Feb. 2018, changes in bold)

QoI fungicides control soybean diseases including rust, which is a major disease in Latin America and has been detected recently in the USA.

In order to ensure sustainable use of QoIs the Working Group recommends:

  1. Apply QoI fungicides according to manufacturer's recommendations for the target disease (or complex) at the specific crop growth stage indicated. Effective disease management is a critical parameter in delaying the build-up of resistant pathogen populations.
  2. Use QoIs preventatively or as early as possible in the disease cycle.
  3. Use QoIs preferably in mixtures (co-formulations or, where permitted, tank mixes)  with fungicides from a different cross-resistance group. At the rate chosen each partner on its own has to provide effective disease control. Refer to manufacturers’ recommendations for rates. In regions where target site mutations in key target soybean pathogens are present mixtures are mandatory.
  4. Limiting the number of sprays containing QoI fungicides is an important factor in delaying the build-up of resistant pathogen populations.
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 varietal tolerance, reduce the planting window, give preference to early-cycle varieties or endorse the destruction of volunteers.


QoI Guidelines: Sugarbeets

(updated Feb. 2018, no changes from 2017 recommendations)

Cercospora beticola

  1. Apply QoI fungicides according to manufacturer’s recommendations for the target disease (or complex) at the specific crop growth stages indicated. 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 from a different cross-resistance group, contributing to the effective control of the target pathogens. 
  3. Apply QoI fungicides preventatively. Under high disease pressure the spray interval should not be extended.
  4. Do not exceed 50% of the total number of sprays with QoI containing products.  In low disease pressure situations where only 1 fungicide application is required for disease control then a QoI – containing mixture (as defined above) may be used.

Where QoI fungicides are used targeting other sugar beet diseases (e.g. rust, powdery mildew, Rhizoctonia, Ramularia and Stemphylium) then the potential impact of applications on the resistance management of Cercospora beticola should be considered.  Where Cercospora beticola is not a disease of importance (e.g. in a certain geography) then the general guidelines for QoI fungicides apply.   

For a printer friendly version of these use recommendations see section 2.2.2.4, 2.2.2.5, and 2.2.2.6 pp.15-16 of Minutes of the 2017 QoI Meeting, Recommendations for 2018.

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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