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FRAC Recommendations for OSBPI fungicides


General Use Recommendations

Updated May 2018, no changes to 2017)

  • Fungicide programs must deliver effective disease management. Apply OSBPIs at effective rates and intervals according to manufacturers’ recommendations. Effective disease management is a critical component to delay the build-up 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. 
  • The number of foliar applications of OSBPI products within a total disease management program must be limited as follows:

Specific Recommendations by Uses / Crops

Foliar treatments


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

      All other crops:

  • Make no more than four (4) applications or 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 products are to be made no more than three (3) times in sequence before applying a fungicide with a different mode of action.
  • 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

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

Do not make more than one seed/soil treatment application of OSBPI per year on the same acreage, targeting the same pathogen.

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

ERDC Dupont de Nemours France SAS
24 Rue du Moulin
68740 Nambsheim, France

E-Mail: Jean-Luc Genet