Agriculture: Grape Pest Management Guidelines

Treatment Timing for Key Diseases

Note: Not all indicated timings may be necessary for disease control.

Disease Dormant Budbreak Full bloom Pre-close Veraison Preharvest/
Postharvest5
Botryosphaeria canker (bot canker) +++ ---- ---- ---- ---- ----
Botrytis bunch rot +++2 ---- +++1 +++1 +++1 +++1
Brown spot ---- ---- ---- +++ +++ +++
Dead arm +++ +++ ---- ---- ---- ----
Downy mildew ---- +++ +++ ---- ---- ----
Esca (black measles) +++2 ---- ---- ---- ---- ----
Eutypa dieback +++ ---- ---- ---- ---- ----
Phomopsis +++ +++ ---- ---- ---- ----
Powdery mildew +++2 +++3 +++3 +++4 ---- ----
Summer bunch rot (sour rot) ---- ---- ---- ---- +++1 +++1
Rating: +++ = most effective, ++ = moderately effective, + = least effective, and ---- = ineffective
1 Apply only if rain is forecasted.
2 Use 10 gallons lime sulfur per acre in at least 100 gallons water.
3 Apply bud break 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.

Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2017. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (PDF)

Text Updated: 06/17