Note: Not all indicated timings may be necessary for disease control.
| Disease | Fall/Dormant | Red bud | Popcorn | Full bloom | Until pit hardening | Preharvest 1 to 3 weeks |
|---|---|---|---|---|---|---|
| brown rot1 | 0 | 3 | 3 | 3 | 0 | 3 |
| Eutypa | 14 | 0 | 0 | 0 | 0 | 0 |
| jacket rot | 0 | 0 | 0 | 3 | 0 | 2 |
| powdery mildew | 0 | 0 | 0 | 3 | 32 | 0 |
| shot hole3 | 0 | 0 | 0 | 2 | 3 | 0 |
| Rating: 3 = most effective, 2 = moderately effective, 1 = least effective, and 0 = ineffective |
| 1 Begin at red bud, add one or two more sprays if weather favors disease. |
| 2 Repeated treatment at 7- to 14-day intervals may be necessary; earlier treatments are most effective. |
| 3 If pathogen spores were found during fall leaf monitoring, apply a shot hole fungicide during bloom, preferably at petal fall or when young leaves first appear. Re-apply when spores are found on new leaves or if heavy persistent spring rains occur. If pathogen spores were not present the previous fall, shot hole control may be delayed until spores are seen on new leaves. |
| 4 Applications are made to pruning cuts. |
Acknowledgment: Adaskaveg et al., 2022. Fungicides, Bactericides, Biocontrols, Biocontrols, and Natural Products for Deciduous Tree Fruit and Nut, Citrus, Strawberry, and Vine Crops in California. (PDF)