Note: not all indicated timings may be necessary for disease control.
| Disease | Dormant | Budbreak | Full bloom | Pre-close | Veraison | Preharvest/ Postharvest |
|---|---|---|---|---|---|---|
| Botryosphaeria dieback (Bot canker) | 3 | 0 | 0 | 0 | 0 | 0 |
| Botrytis Bunch Rot | 22 | 0 | 31 | 31 | 31 | 31 |
| Brown spot | 0 | 0 | 0 | 3 | 3 | 3 |
| Downy mildew | 0 | 3 | 3 | 0 | 0 | 0 |
| Esca (Black measles) | 12 | 0 | 0 | 0 | 0 | 0 |
| Eutypa Dieback | 3 | 0 | 0 | 0 | 0 | 0 |
| Phomopsis | 3 | 3 | 0 | 0 | 0 | 0 |
| Phomopsis dieback | 3 | 0 | 0 | 0 | 0 | 0 |
| Powdery mildew | 22 | 33 | 33 | 34 | 0 | 0 |
| Summer bunch rot (sour rot) | 0 | 0 | 0 | 0 | 31 | 35 |
| Rating: 3 = most effective, 2 = moderately effective, 1 = least effective, and 0 = ineffective |
| 1 Apply only if rain is forecasted. |
| 2 Use 10 gallons lime sulfur per acre in at least 100 gallons water. |
| 3 Apply budbreak and full bloom treatments every year. |
| 4 Apply as needed (a disease risk assessment model is available to help determine need for spray). |
| 5 Preharvest treatments for postharvest decay control. |
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)