Fungicide Resistance Action Committee
In case you are interested in background information for OSBPI fungicides, please follow this link: Information on OSBPI fungicides

FRAC Recommendations for OSBPI fungicides


General Use Recommendations

(Updated April 2023, no changes in 2023)

  • Fungicide programs must deliver effective disease management. Apply OSBPIs at effective rates and intervals according to manufacturers’ recommendations. Effective disease management throughout the season is a critical component to delay the build-up and spread of resistant pathogen populations.
  • Apply OSBPIs only preventatively and in mixtures with effective fungicides from different cross-resistance groups.
  • The mixture partner should give effective control of the target disease(s) at the rate and interval selected.
  • Foliar exposure to OSBPI products should not exceed thirty-three percent (33%) of the total period of protection needed per crop. 

Specific Recommendations by Uses / Crops

The number of foliar applications of OSBPI products within a total disease management program must be limited as follows:

Foliar treatments


  • Make no more than two (2) applications per season.

      All other crops:

  • Make no more than four (4) applications or maximum 33% of the total period of protection needed per crop, whichever is more restrictive.
  • Where the total number of fungicide applications targeting oomycetes is less than three (3), apply no more than one (1) application of an OSBPI product.
  • There should be no more than two (2) foliar applications of any OSBPI product for the control of soil-borne pathogens.
  • Applications of OSBPI-containing products are to be made no more than three (3) times in sequence before applying a fungicide with a different mode of action. In areas where the agronomic risk is very high (e.g. continuous potato or cucurbit cropping) and resistance has already been reported, further restrictions to the number of consecutive applications are recommended.
  • Applications of OSBPI products can be made in alternation with a fungicide with a different mode of action.

Seed/soil treatments

No foliar fungicide application of an OSBPI fungicide should be made following a seed/soil treatment* with OSBPI fungicides targeting the same pathogen.

* Directed stem sprays are interpreted as foliar not soil application.

Multiple crops on the same production unit

In case of non-cucurbit multiple crops, do not make more than six (6) foliar applications of OSBPI product per year on the same acreage or greenhouse, targeting the same pathogen.

Specifically, in the case of cucurbit crops, do not make more than four (4) applications per year on the same acreage or greenhouse, targeting P. cubensis.

Nursery crops

OSBPI products must not be used in nursery production of transplanted agricultural crops.


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.


Jean-Luc Genet

Corteva agriscience
82 rue de Wittelsheim
68700 Cernay, France