Note: Not all indicated timings may be necessary for disease control.
| Disease | Dormant | Green bud | Popcorn | Full bloom | Until pit hardening | Preharvest |
|---|---|---|---|---|---|---|
| brown rot1 | 0 | 1 | 2 | 3 | 0 | 1 |
| powdery mildew | 0 | 1 | 1 | 3 | 3 | 0 |
| shot hole2 | 0 | 0 | 0 | 0 | 0 | 0 |
| Rating: 3 = most effective; 2 = moderately effective; 1 = least effective; 0 = ineffective |
| 1One early application should suffice; a second treatment should not be needed. |
| 2No treatment is recommended for shot hole because the shot holes found on plum leaves only rarely are caused by the shot hole fungus. |
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)