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