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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Grape

2009 Fungicide Efficacy and Treatment Timing

(Reviewed 3/09, updated 3/09)

In this Guideline:

FUNGICIDE EFFICACY FOR GRAPEVINE DISEASES

Fungicide Resistance risk (FRAC#)1 Powdery mildew Downy mildew Bunch rot Phomopsis Eutypa
Botrytis Summer
Abound high (11)2 ++++ ++++ + ---- +++ ----
Adament medium (3/11) ++++ + ++ ++ ++ ----
Distinguish* medium (9/11) ++++ ++ ++++ ++ ++ ----
Flint3 high (11)2 ++++ +++ ++ ++ ++ ----
Elite/Orius/Tebuzol high (3) ++++ ---- ++ ++ ---- ----
Eminent6 high (3) ++++ ---- ---- ---- ---- ----
Inspire** high (3) ++++ ---- ---- ---- ---- ----
JMS Stylet oil4 low ++++ ---- +++ ++ ---- ----
Pristine medium (7/11)2 ++++ ++++ ++++ +++ +++ ----
Procure high (3) ++++ ---- ---- ---- ---- ----
Quintec high (13) ++++ ---- ---- ---- ---- ----
Rally high (3) ++++ ---- ---- ---- ---- +++
Rubigan high (3) ++++ ---- ---- ---- ---- ----
Sovran high (11)2 ++++ ++++ ++ ++ ++++ ----
Sulfur low (M2) ++++ ---- ---- ---- ---- ----
Topguard** high (3) ++++ ---- ---- ---- ---- ----
Topsin-M/T-Methyl/Thiophanate-Methyl high (1)2 ++++ ---- ++ ++ + ++++
Vivando* high (U8) ++++ ---- ---- ---- ---- ----
Armicarb low +++ ---- ---- ---- ---- ----
Cinnacure low +++ ---- ---- ---- ---- ----
Elexa5 low ++ ---- ---- ---- ---- ----
Kaligreen low +++ ---- ---- ---- ---- ----
Messenger low +++ ---- ---- ---- ---- ----
Milstop low +++ ---- ---- ---- ---- ----
Purespray low +++ ---- ---- ---- ---- ----
Rovral + Oil4 low (2) +++ ---- ++++ ---- ---- ----
Serenade low +++ ---- ++ + ---- ----
Sporan** low ++ ---- ---- ---- ---- ----
Sonata low +++ ---- NR NR ---- ----
Copper low (M1) ++ +++ ++ +++ + ----
Bayleton high (3) ++ ---- ---- ---- ---- ----
Elevate high (17) 2 ++ ---- ++++ ++ ---- ----
Scala high (9)2 ++ ---- ++++ ++ ---- ----
Vangard high (9)2 ++ ---- ++++ ++ ---- ----
VigorCal** low ++ ---- ---- ---- ---- ----
VigorK** low ++ ---- ---- ---- ---- ----
Timorex**,4 low ++ ---- ---- ---- ---- ----
Prev-am**,4 low ++ ---- ---- ---- ---- ++
Captan low (M4) ---- + +++ +++ +++ ----
CaptEvate* low (M4/17) ---- + +++ +++ + ----
Dithane/Manzate/Penncozeb (Maneb is being phased out) low (M3) ---- ---- ++ ---- +++ ----
Revus high (40) ---- ++++ ---- ---- ---- ----
Ridomil Gold/Mefenoxan high (4) ---- ++++ ---- ---- ---- ----
Rovral/Iprodione/Nevado low (2) ---- ---- +++ ---- ---- ----
Rating: ++++ = excellent and consistent, +++ = good and reliable, ++ = moderate and variable, + = limited and/or erratic, +/- = minimal and often ineffective, ---- = ineffective, and NR = not recommended.
* Registration pending.
1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of actions (for more information, see http://www.frac.info/). Fungicides with a different group number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode of action Group numbers 1, 4, 9, 11, or 17 before rotating to a fungicide with a different mode of action Group number; for fungicides with other Group numbers, make no more than two consecutive applications before rotating to fungicide with a different mode of action Group number.
2 To reduce the risk of resistance development start treatments with a fungicide with a multi-site mode of action; rotate or mix fungicides with different mode of action FRAC numbers for subsequent applications, use labeled rates (preferably the upper range), and limit the total number of applications/season.
3 Causes severe phytotoxicity on Concord grape.
4 Phytotoxic if used within 2 weeks of Captan or sulfur.
5 Label withdrawn.

TREATMENT TIMINGS FOR KEY DISEASES

Note: Not all indicated timings may be necessary for disease control.
Disease Dormant Budbreak Full bloom Pre-close Veraison Preharvest/
Postharvest
Botryosphaeria canker +++ ---- ---- ---- ---- ----
Botrytis +++2 ---- +++1 +++1 +++1 +++1
Downy mildew ---- +++ +++ ---- ---- ----
Esca +++2 ---- ---- ---- ---- ----
Eutypa +++ ---- ---- ---- ---- ----
Powdery mildew +++2 +++3 +++3 +++4 +++4 +++
Summer rot ---- ---- ---- ---- ++++1 +++1
Rating: +++ = most effective, ++ = moderately effective, + = least effective, and ---- = ineffective
1  Apply only if rain is forecast.
2 Use 10 gal lime sulfur per acre in at least 100 gal 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).

Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2009. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (960 KB, PDF)

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448
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Statewide IPM Program, Agriculture and Natural Resources, University of California
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