Agriculture: Cherry Pest Management Guidelines

General Properties of Fungicides

Common name
(Example trade name)
Chemical class
(FRAC #)1
Activity Mode of action Resistance potential Comments
azoxystrobin (Abound) Qol5 (11) contact, systemic single-site high6
azoxystrobin/difenoconazole (Quadris Top) QoI5/DMI2-triazole (11/3) contact, systemic (local) single-site/single site medium  
azoxystrobin/propiconazole (Quilt Xcel) QoI5/DMI2-triazole (11/3) contact, systemic (local) single-site/single site medium  
captan (Captan) phthalimide (M4) contact multi-site low highly toxic to honey bee larvae
chlorothalonil (Bravo/etc.) chloronitrile (M5) contact multi-site low  
dicloran (Botran 75W) aromatic hydrocarbon (14) contact/systemic7 single–site medium  
fenarimol (Rubigan) DMI2-pyrimidine (3) systemic (local) single-site high  
fenbuconazole (Indar) DMI2-triazole (3) systemic (local) single-site high  
fenhexamid (Elevate) hydroxyanilide (17) contact single-site high6 pre- and postharvest
fludioxonil (Scholar) phenylpyrrole (12) systemic (local) single-site (oligo-site) medium postharvest on fruit
fluopyram/trifloxystrobin (Luna Sensation) SDHI4/QoI5 (7/11) contact, systemic single-site/single site medium to high postharvest on fruit
fosetyl-al (Aliette) ethyl phosphonate (P07,33) systemic ¬†unknown ¬†low  
iprodione (Rovral/Nevado/) dicarboximide (2) systemic (local) single-site? low to medium  
mefenoxam (Ridomil Gold) phenylamide (4) contact, systemic single-site high6  
metconazole (Quash) DMI2-triazole (3) systemic (local) single-site high  
myclobutanil (Rally) DMI2-triazole (3) systemic (local) single-site high  
penthiopyrad (Fontelis) SDHI4 (7) contact single-site high6  
propiconazole (Bumper) DMI2-triazole (3) systemic (local) single-site high pre- and postharvest
pyraclostrobin/boscalid (Pristine) QoI5/SDHI4 (11/7) contact, systemic single-site/single-site medium to high  
quinoxyfen (Quintec) quinoline (13) contact single-site medium to high  
sulfur inorganic (M2) contact multi-site low highly toxic to native strains of western predatory mite (Galendromus occidentalis) and to parasites
tebuconazole (Elite) DMI2-triazole (3) systemic (local) single-site high pre- and postharvest
tebuconazole/trifloxystrobin (Adament) DMI2-triazole/QoI5 (3/11) contact, systemic (local) single-site/single-site medium to high  
thiophanate-methyl (Topsin-M) MBC3 (1) systemic (local) single-site very high6  
triflumizole (Procure) DMI2-imidazole (3) systemic (local) single-site high  
1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of action. Fungicides with a different mode-of-action group number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode-of-actions group number with high resistance risk before rotating to a fungicide with a different mode-of-action group number; for other fungicides, make no more than two consecutive applications before rotating to fungicide with a different mode-of-action group number.
2 DMI = demethylation (sterol) inhibitor
3 MBC = methyl benzimidazole carbamate
4 SDHI = succinate dehydrogenase inhibitor
5 QoI = quinone outside inhibitor (strobilurin)
6 Resistance has been found in California for certain fungicides with a single-site mode of action. To reduce the risk of resistance development, take the mode of action into account when choosing a fungicide. At the beginning of a treatment program, use a fungicide with a multi-site mode of action; for subsequent applications rotate or mix fungicides with different mode of action FRAC numbers. Use labeled rates (preferably the upper range) of the single-site fungicides, and limit the total number of applications per season.
7 Unsure or lacking scientific evidence. For fungicides, this indicates general acceptance of systemic action based on performance data, but this characteristic may not have been proven experimentally using more rigorous assays (e.g., radioactively labeled compounds).

Acknowledgment: Adaskaveg et al., 2022. Fungicides, Bactericides, Biocontrols, and Natural Products for Deciduous Tree Fruit and Nut, Citrus, Strawberry, and Vine Crops in California.(PDF)

Text Updated: 06/22