| Fungicide | Resistance risk (FRAC group number)1,3 |
Scab | Powdery mildew | |
|---|---|---|---|---|
| protectant | eradicant | |||
| Actinovate | low, BM 02 | 2/3 | 0 | 2/3 |
| Blight-Ban | low, BM 02 | 2/3 | 0 | 2/3 |
| Blossom Protect | low, BM 02 | 2/3 | 0 | 2/3 |
| Copper2 | low, M 01 | 2/3 | 0 | 2 |
| Double Nickel 55 | low, BM 02 | 2/3 | 0 | 2/3 |
| Gargoil | low, BM 01 | 2 | 0 | 3 |
| Lime sulfur | low, M 02 | 3 | 0 | 4 |
| Procidic | low, BM 01 | ND | 0 | ND |
| Regalia | low, P 05 | 2/3 | 0 | 2/3 |
| Serenade | low, BM 02 | 2/3 | 0 | 2/3 |
| Sulfur2 | low, M 02 | 3 | 0 | 5 |
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, ND = no data.
| 1 | Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of action (for more information, see www.frac.info). Fungicides with different group numbers are suitable to alternate in a resistance management program. In California, make no more than one application of a fungicide with a mode-of-action group number associated 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 | Though copper may be effective for scab and blight control under low disease pressure, copper products may cause fruit scarring or russeting. |
| 3 | Biologicals: FRAC groups are provided as BM-No. or P-No. groups. In general, sulfur compounds are fungicidal and may affect applications of fungal biocontrols (e.g., Blossom Protect); whereas copper may affect applications of bacterial biocontrols (e.g., Actinovate, Bloomtime Biological, Blight Ban, Double Nickel 55, and Serenade). Rotations must consider these factors. |
Acknowledgment: Adaskaveg et al., 2025. Fungicides, Bactericides, Biocontrols, and Natural Products for Deciduous Tree Fruit and Nut, Citrus, Strawberry, and Vine Crops in California.