Not all indicated timings may be necessary for disease control.
| Bloom | 3 to 6 weeks | Preharvest1 | ||||
|---|---|---|---|---|---|---|
| Disease | Dormant | 20 to 40% | 80 to 100% | postbloom | 3 weeks | 1 week |
| Brown rot | 0 | 2 | 3 | 1 | 2 | 3 |
| Leaf curl3 | 3 | 1 | 0 | 0 | 0 | 0 |
| Powdery mildew | 0/ND | 2 | 3 | 32 | 0 | 0 |
| Rust | 14 | 0 | 0 | 3 | 2 | 0 |
| Scab | 0 | 1 | 2 | 3 | 0 | 0 |
| Shot hole5 | 3 | 1 | 1 | 2 | 0 | 0 |
| Rating: 3 = most effective, 2 = moderately effective, 1 = least effective, and 0 = ineffective (ND=No data). |
| 1Timing not exact; weather conditions determine need for treatment. |
| 2Apply until pit hardening. |
| 3Treatment should be made before bud break and preferably before bud swell. |
| 4Dormant treatment with liquid lime sulfur. |
| 5Fall application before winter rains begin is the most important; additional spring sprays are seldom required but may be needed to protect the fruit if heavy persistent spring rains occur. |
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)