Agriculture: Strawberry Pest Management Guidelines

General Properties of Fungicides Used in Strawberries

Common name
(Example trade name)
Class Group (FRAC) number1 Activity Mode of action Resistance potential Comments
azoxystrobin (Abound, Quadris Top) Qol4 11 contact, systemic2 single-site high Resistance in Botrytis and Colletotrichum documented
captan phthalamide M4 contact multi-site low toxic to honey bee larvae
chlorothalonil (Bravo) chloronitrile M5 contact multi-site low  
cyflufenamid (Torino) phenyl-acetamide U6 contact  
cyprodinil/fludioxonil (Switch) anilinopyrimidine /phenylpyrrole 9/12 contact/slightly systemic single-site/single-site medium  
fenhexamid (Elevate) hydroxyanilide 17 contact single-site medium Resistance in Botrytis documented
fluopyram (Luna Privilege) SDHI5 7 contact single-site high  
fluopyram/trifloxystrobin (Luna Sensation) SDHI5/Qol4 7/11 contact, systemic single-site/single-site high  
fosetyl-al (Aliette) phosphonates 33 systemic unknown low  
insecticidal soap (M-pede) inorganic salt contact low  
iprodione (Rovral) dicarboximide 2 systemic (local) single-site? high toxic to honey bee larvae
isofetamid (Kenja) SDHI5 7 contact single-site high  
mefenoxam (Ridomil Gold) phenylamide 4 contact, systemic single-site high  
myclobutanil (Rally) DMI3 3 systemic (local)2 single-site medium

penthiopyrad (Fontelis) SDHI5 7 contact single-site high  
phosphorous acid (Fosphite) phosphonates 33 systemic multi-site? low  
pyraclostrobin/boscalid (Pristine) Qol4/SDHI5 11/7 contact, systemic2 single-site/single-site high Resistance in Botrytis documented
pyraclostrobin/fluxapyroxad (Merivon) Qol4/SDHI5 11/7 contact, systemic single-site/single-site high  
quinoxyfen (Quintec) azanaphthalenes 13 contact single-site medium  
sulfur inorganic M2 contact multi-site low  
tetraconazole (Mettle) DMI3 3 systemic (local) single-site high  
thiophanate-methyl (Topsin-M) MBC6 1 systemic (local) single-site very high Resistance in Botrytis documented
thiram dithiocarbamates M3 contact multi-site low  
triflumizole (Procure) DMI3 3 systemic (local)2 single-site medium  
1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of action. 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

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

Text Updated: 07/18