| Fungicide | Resistance risk (FRAC group number)1,4 |
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 |
| Copper3 | low, M1 | 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, M2 | 3 | 0 | 4 |
| Procidic | low, BM 01 | ND | 0 | ND |
| Regalia | low, BM 01, P 05 | 2/3 | 0 | 2/3 |
| Serenade | low, BM 02 | 2/3 | 0 | 2/3 |
| Serifel2 | low, BM 02 | 2/3 | 0 | 2/3 |
| Sulfur3 | low, M2 | 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. |
| 1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of action. 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 Labeled on apple only in California (SAR = systemic acquired resistance). |
| 3 Though copper may be effective for scab and blight control under low disease pressure, copper products may cause fruit scarring or russeting. |
| 4 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., 2022. Fungicides, Bactericides, Biocontrols, and Natural Products for Deciduous Tree Fruit and Nut, Citrus, Strawberry, and Vine Crops in California. (PDF)