| Common name (Example trade name) |
Chemical class (FRAC # )1 |
Activity | Mode of action | Resistance potential |
|---|---|---|---|---|
| copper sulfate | inorganic ( M1) | contact | multi-site | low |
| cyprodinil + fludioxonil (Switch) | Anilinopyrimidine + phenylpyrrole (9 + 12) | mostly contact | single-site + multi-site | high/low |
| chloropicrin (Pic-clor 60) | soil fumigant | mostly contact | multi-site (FRAC numbers not applicable) | low |
| fenhexamid (Elevate) | hydroxyanilide (17) | contact | single-site | high |
| fosetyl-al (Aliette) | phosphorothiolate (33) | systemic | — | — |
| iprodione (Rovral) | dicarboximide (2) | systemic (local) | multi-site | low |
| lime sulfur | inorganic ( M1) | contact | multi-site | low |
| mefenoxam (Ridomil Gold) | acylalanine (4) | systemic | single-site | high |
| myclobutanil (Rally) | DMI2-triazole (3) | systemic (local) | single-site | high |
| potassium bicarbonate (Kaligreen) | inorganic | contact | — | — |
| pyraclostrobin (Cabrio) | strobilurin (11) | contact & systemic | single-site | high |
| pyraclostrobin + boscalid (Pristine) | strobilurin (11 + 7) | contact & systemic | single-site + multi-site | medium |
| sulfur | inorganic ( M2) | contact | multi-site | low |
| — = no information | |
| 1 | Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of actions. 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 a fungicide with a different mode of action Group number. |
| 2 | DMI= demethylation (sterol) inhibitor |
Acknowledgment: Adaskaveg et al., 2013. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops.