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In case you are interested in background information for CAA fungicides, please follow this link: Information on CAA fungicides


FRAC Recommendations for CAA fungicides

(Updated April 2020, no changes to 2019)
 

  
General Use Recommendations (all Crops)

  • Apply CAA fungicides preferably in a preventive manner
  • Alternation with fungicides having other modes of action is recommended in spray programs
  • For more detailed product recommendations refer to the use guidelines published by the respective CAA manufacturers.

  
Specific Recommendations by Pathogens

  

Grape downy mildew/Plasmopara viticola

Plasmopara viticola is classified by FRAC as a high risk pathogen. Long-term experience with CAA fungicides demonstrates that the resistance risk of Plasmopara viticola to this fungicide group is moderate and can be managed through appropriate use strategies.

  • Apply a maximum of 50 % of the total number of intended applications for disease control not exceeding a total of 4 CAA fungicide sprays during one crop cycle. In areas of high resistance the total number should not exceed a maximum of 3 applications during one crop cycle
  • Always apply CAA fungicides in mixture with effective partners such as multi-site or other non cross resistant fungicides
  • An effective partner for a CAA fungicide is one that provides satisfactory disease control when used alone at the mixture rate

Late blight of potato and tomato/Phytophthora infestans

No resistant isolates from field populations have been found since the introduction of CAA fungicides in 1993.

Phytophthora infestans is classified by FRAC as a medium risk pathogen. Long-term experience with CAA fungicides demonstrates that the resistance risk of Phytophthora infestans to this fungicide group is low to moderate. For effective resistance management a precautionary strategy has to be implemented.

  • Apply a maximum of 50 % of the total number of intended applications for late blight control.

Downy mildew of cucurbits/Pseudoperonospora cubensis

Pseudoperonospora cubensis is classified by FRAC as a high risk pathogen.

  • Apply a maximum of 50 % of the total number of intended applications for disease control not exceeding a total of 4 CAA fungicide sprays during one crop cycle. In areas of high resistance the total number should not exceed a maximum of 3 applications during one crop cycle
  • Always apply CAA fungicides in mixture with effective partners such as multi-site or other non cross resistant fungicides
  • An effective partner for a CAA fungicide is one that provides satisfactory disease control when used alone at the mixture rate.

Other Oomycete pathogens

Some of the downy mildew pathogens are classified by FRAC as moderate risk pathogens (e.g. Bremia lactucae). In spite of the use of CAA fungicides for more than 15 years against a range of such Oomycete pathogens, no reports on the occurrence of less sensitive field populations are available.

  • For effective resistance management a precautionary strategy has to be implemented.
  • Apply a maximum of 50 % of the total number of intended applications for disease control.
For a printer friendly version of these use recommendations, please refer to the most recent Minutes in the table below (PDF-document, last pages).

 
References

 

Monitoring Results and Use Recommendations

At the annual meeting, the working group reviews the current year's monitoring results and decides whether they require changes be made to the next year's use recommendations.  The minutes of those meetings are below.

Contact

Dr. Gerd Stammler
Chair

BASF SE
APR/FM - LI470,
67117 Limburgerhof
Germany

Tel. +49 621 60-27299
FAX: +49 621 60-27176
gerd.stammler@basf.com