Stone Fruit Fungicides - Resistance Management

The following table lists fungicides registered for use on stone fruit in British Columbia for brown rot and/or powdery mildew, categorized by resistance group.

Products in the same group have similar or identical modes of action.  Over-use of products in one class of compounds will lead to resistance problems.  See recommendations below for resistance management. Also check market requirements for each fungicide when considering which product to use.

Fungicide

Group*

 Class Crops Disease Spectrum
Nova (myclobutanil) 3 Triazole cherry, peach, nectarine brown rot, powdery mildew
Indar (fenbuconazole) 3 Triazole all stone fruit brown rot, powdery mildew
Topas (propiconazole) 3 Triazole all stone fruit brown rot, powdery mildew
Mission (propiconazole) 3 Triazole all stone fruit brown rot, powdery mildew
Funginex (triforine) 3 Piperazine peach, cherry, prune/plum brown rot, powdery mildew
Flint (trifloxystrobin) 11 QoI (Strobilurin) cherry powdery mildew
Cabrio (pyraclostrobin) 11 QoI (Strobilurin) all stone fruit powdery mildew (cherry), suppression of brown rot
Pristine (pyraclostrobin + boscalid) 11 + 7 Qol + Anilide all stone fruit Brown rot, rhizopus rot, powdery mildew
Vangard (cyprodinil) 9 Anilinopyrimidine apricot, peach, nectarine, prune/plum brown rot, botrytis
Lance (boscalid) 7 Anilide all stone fruit brown rot, botrytis
Pristine (pyraclostrobin + boscalid) 7 + 11 Anilide + Qol all stone fruit Brown rot, rhizopus rot, powdery mildew
Elevate (fenhexamid) 17 Hydroxyanilide cherry, peach, nectarine brown rot, botrytis
Rovral (iprodione) 2 Dicarboximide apricot, cherry, peach, plum/prune brown rot, botrytis
Senator (thiophanate-methyl) 1 Benzimidazole cherry, peach, nectarine,  prune/plum brown rot, powdery mildew
Captan/Maestro M4 Phthalimide all stone fruit brown rot
Bravo (chlorothalonil) M5 Chloronitrile cherry, peach, nectarine brown rot, peach leaf curl
Kumulus (sulphur) M1 Inorganic cherry, peach, prune/plum powdery mildew
MilStop (potassium bicarbonate) NC Diverse all stone fruit powdery mildew (suppression)
*M = multi-site inhibitor; NC = unclassified

Fungicide Resistance Management

Fungicide resistance management is important to prolong the effectiveness of "at risk" fungicides and to limit crop losses should resistance occur. Nova, Topas, Mission, Funginex and Senator are at high risk of resistance. Rovral, Lance and Elevate are rated as medium risk for resistance.

To help prevent resistance from developing:

  • Alternate between different fungicide groups. Do not use more than 2 back-to-back sprays of fungicides with the same group number.
  • Use recommended tank mixes.
  • Use only recommended dose rates.
  • Ensure sprayer is properly calibrated to deliver accurate and thorough coverage.
  • Integrate with non-chemical control methods.
  • Discontinue use of a product if resistance is suspected and consult your crop advisor.

More Information on fungicide resistance and categories - Fungicide Resistance Action Committee (FRAC)

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