How to Manage Pests

UC Pest Management Guidelines


General Properties of Fungicides Used in Strawberries

(Reviewed 6/08, updated 5/10, corrected 6/17)

In this Guideline:

Common name
(Example trade name)
Chemical class Group (FRAC) number1 Activity Mode of action Resistance potential Comments
azoxystrobin (Abound) Qol4 11 contact, systemic2 single-site high  
captan phthalamide M4 contact multi-site low toxic to honey bee larvae; do not apply during bloom
cyprodinil (Vangard) anilinopyrimidine 9 mostly contact, slightly systemic single-site high 
cyprodinil/fludioxonil (Switch) phenylpyrrole/ anilinopyrimidine 12/9 contact/ slightly systemic single-site / single-site medium 
fenhexamid (Elevate) hydroxyanilide 17 contact single-site high  
fludioxonil (Scholar) phenylpyrrole 12 contact few to multi-site medium  
fosetyl-al (Aliette) ethyl phosphonate 33 systemic unknown low  
iprodione (Rovral) dicarboximide 2 systemic (local) single-site? medium toxic to honey bee larvae; do not apply during bloom
mefenoxam (Ridomil Gold) phenylamide 4 contact, systemic single-site high  
myclobutanil (Rally) DMI3-triazole 3 systemic (local)2 single-site high 
pyraclostrobin (Cabrio) Qol4 11 contact, systemic2 single-site high  
pyraclostrobin / boscalid (Pristine) Qol4/ SDHI 5 11/7 contact, systemic2 single-site / single-site high 
quinoxyfen (Quintec) quinoline 13 contact single-site medium  
thiophanate-methyl (Topsin) MBC6 1 systemic (local) single-site very high  
thiram dithiocarbamates M3 contact multi-site low  
triflumizole (Procure) DMI3-imidazole 3 systemic (local)2 single-site high  
1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according todifferent modes of actions (for more information, see Fungicides with a different group number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode-of-action group numbers 1, 4, 9, 11, or 17 before rotating to a fungicide with a different mode-of-action group number; for fungicides with other Group numbers, make no more than two consecutive applications before rotating to fungicide with a different mode-of-action group number.
2 Generally considered to have systemic action based on performance data but has not been proven experimentally.
3 DMI = demethylation (sterol) inhibitor
4 Qol = quinone outside inhibitor (strobilurin)
5 SDHI = succinate dehydrogenase inhibitor
6 MBC= methyl benzimidazole carbamate



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Strawberry
UC ANR Publication 3468

General Information

Acknowledgment: Adaskaveg et al., 2017. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops. (PDF)

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