Note: Timings listed are effective but not all may be required for disease control. Timings used will depend upon orchard history of disease, length of bloom, and weather conditions each year.
| Disease | Green bud | White bud | Full bloom | May | June | July |
|---|---|---|---|---|---|---|
| Brown rot1 | 3 | 3 | 3 | 0 | 1 | 2 |
| Russet scab2 | 0 | 0 | 3 | 0 | 0 | 0 |
| Rust3 | 0 | 0 | 0 | 1 | 2 | 3 |
| Rating: 3 = most effective, 2 = moderately effective, 1 = least effective, and 0 = ineffective |
| 1 Flowers are susceptible beginning with the emergence of the sepals (green bud) until the petals fall but are most susceptible when open. |
| 2 A physiological disorder; no pathogens involved. |
| 3 More severe when late 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)