| Fungicide*** | Resistance risk (FRAC group number)1 |
Brown rot2 | Powdery mildew2 | Scab | Rust | Leaf curl | Shot hole | |
|---|---|---|---|---|---|---|---|---|
| Blossom | Fruit | |||||||
| Abound | high (11)4 | 3 | 2 | 3 | 5 | 4 | 0 | 3 |
| Adament** | high (3/11) | 5 | 5 | 4 | 3 | 4 | 0 | 3 |
| Botran | medium (14) | 3 | 2 | ND | ND | ND | ND | ND |
| Bravo, Echo, Equus8,9 | low (M5) | 3 | 0 | 0 | 4 | 2 | 4 | 4 |
| Bumper,Tilt | high (3) | 5 | 5 | 4 | 3 | 4 | 0 | 1 |
| Captan9 | low (M4) | 3 | 3 | 0 | 4 | 0 | 0 | 410,12 |
| Cevya | high (3) | 5 | 5 | 4 | 3 | 4 | 0 | 3 |
| Copper | low (M1) | 1 | 0 | 0 | 0 | 0 | 4 | 4 |
| Elevate | high (17)4 | 4 | 4 | ND | ND | ND | ND | ND |
| Flint Extra | high (11)4 | 3 | 2 | 3 | 5 | 4 | 0 | 3 |
| Fontelis | high (7)4 | 5 | 4 | 5 | 4 | ND | 0 | 410,12 |
| Indar | high (3) | 5 | 5 | 4 | 3 | ND | 0 | 1 |
| Inspire Super | high (3/9) | 5 | 5 | 4 | 3 | ND | 0 | 1 |
| Kenja | high (7)4 | 5 | 4 | NL | NL | NL | NL | NL |
| Luna Experience | medium (3/7) | 5 | 5 | 4 | 0 | 4 | 0 | 1 |
| Luna Sensation | medium (7/11)4 | 5 | 5 | 4 | 4 | 4 | ND | 510,12 |
| Merivon | medium (7/11)4 | 5 | 5 | 4 | 4 | 4 | ND | 510,12 |
| Miravis Duo | medium (3/7) | 5 | 5 | 4 | 4 | 4 | 0 | 4 |
| Orius, Teb, Tebuconazole | high (3) | 5 | 5 | 4 | 3 | 4 | 0 | 2 |
| Ph-D, Oso | high (19) | 3 | 3 | 3 | ND | NL | ND | ND |
| Pristine | medium (7/11)4 | 5 | 5 | 4 | 4 | ND | ND | 510,12 |
| Protocol3 | med.-high (1/3) | 5 | 5 | 5 | 4 | 5 | 0 | 4 |
| Quadris Top | medium (3/11) | 5 | 5 | 4 | 0 | 4 | 0 | 1 |
| Quash | high (3) | 5 | 5 | 4 | ND | 4 | 0 | 410,12 |
| Quilt Xcel,Avaris 2XS | medium (3/11) | 5 | 5 | 4 | 0 | 4 | 0 | 1 |
| Quintec | high (13) | 0 | 0 | 5 | 0 | 0 | 0 | 0 |
| Rally | high (3) | 4 | 4 | 5 | 0 | 0 | 0 | 0 |
| Rhyme | high (3) | 4 | 3 | 4 | ND | ND | 0 | 210 |
| Rovral, Iprodione, Nevado5 | low (2) | 4 | NL | 0 | 0 | 0 | 0 | 0 |
| Rovral5 + oil6 | low (2) | 5 | NL | 2 | 2 | 3 | 0 | 3 |
| Scala7 | high (9)3,4 | 5 | 47 | ND | ND | ND | 0 | 2 |
| Sulfur9 | low (M2) | 1 | 1 | 4 | 4 | 4 | 0 | 0 |
| Syllit | medium (U12) | 2 | 0 | 0 | 4 | 0 | 3 | 4 |
| Thiram11 | low (M3) | 1 | 0 | 0 | 4 | 0 | 5 | 4 |
| Topsin-M,T-Methyl, Incognito,Cercobin | high (1) 3,4 | 5 | 5 | 4 | 4 | 2 | 0 | 0 |
| Vangard7 | high (9) 3,4 | 5 | 47 | ND | ND | ND | 0 | 2 |
| Viathon | medium (3/33, P07) | 5 | 5 | 4 | 3 | 4 | 0 | 2 |
| Vivando | high (50) | 0 | 0 | 4 | 0 | 0 | 0 | 0 |
| Ziram | low (M3) | 1 | 0 | 0 | 4 | 0 | 5 | 4 |
| Rating: 5 = excellent and consistent, 4 = good and reliable, 3 = moderate and variable, 2 = limited and/or erratic, 1 = minimal and often ineffective, 0 = ineffective, NL = not on label, and ND = no data. |
| * Registration pending in California. |
| ** Not registered, label withdrawn or inactive in California |
| *** Postharvest fruit registrations in California include: BioSpectra/Cerafruta/Unigard, Chairman, Mentor, Penbotec/Pyrimethanil, and Scholar/FDL. |
| 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 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 Do not use fungicides with the same FRAC number and high resistance risk more than twice in one year. |
| 3 Strains of Monilinia fructicola resistant to Topsin-M and T-Methyl are present in some peach and nectarine orchards. Resistant strains of the jacket rot fungus, Botrytis cinerea, and powdery mildew fungi have been reported in California on crops other than almond and stone fruits and may have the potential to develop in peach and nectarine with overuse of fungicides with similar chemistry. Sub-populations of both Monilinia spp. have been shown to be resistant to AP (FRAC 9) fungicides on prune in CA. |
| 4 To reduce the risk of resistance development, start treatments with a fungicide with a multi-site mode of action; rotate or mix fungicides with different mode-of-action FRAC group numbers for subsequent applications, use labeled rates (preferably the upper range), and limit the total number of applications per season. |
| 5 Blossom blight only; not registered for use after petal fall. |
| 6 Oil is a "light" summer oil, 1 to 2% volume/volume. |
| 7 High summer temperatures and relative humidity reduce efficacy. |
| 8 Do not use after jacket (shuck) split. |
| 9 Do not use in combination with or shortly before or after oil treatment. |
| 10 Not effective if used as a dormant treatment. |
| 11 For use on peach only; not registered on nectarine. |
| 12 For shot hole management, dormant treatments with copper, ziram, and dodine are highly effective. Petal fall treatments should be used to complement the management program. |
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)