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Grape

General Properties of Fungicides Used in Grapes

(Reviewed 6/06, updated 9/08)

In this Guideline:
Common name
(trade name)		 Chemical class Activity Mode of action
(FRAC Group No.1)		 Resistance potential Comments
azoxystrobin (Abound) QoI5 systemic2 single-site (11) high  
Bacillus pumilis (Sonata) fermentation product contact various low  
Bacillus subtilis (Serenade) fermentation product contact various low  
captan phthalamide contact various low highly toxic to honey bee larvae
cinnamaldehyde (Cinnacure) natural product contact various low  
copper inorganic contact multi-site (M1) low  
copper hydroxide inorganic contact multi-site (M1) low  
copper sulfate inorganic contact multi-site (M1) low  
cyprodinil (Vangard) anilinopyrimidine mostly contact, slightly systemic single-site (9) high  
DCNA (Botran) aromatic hydrocarbon systemic (local) single-site (14) medium  
fenarimol (Rubigan) DMI3-pyrimidine systemic2 single-site (3) high  
fenhexamid (Elevate) hydroxyanilide contact single-site (17) high  
GABA/L-glutamic acid (AuxiGro) SAR4 – protein systemic host resistance (—) unknown  
harpin protein (Messenger) SAR4 – protein systemic host resistance (—) unknown  
iprodione (Rovral) dicarboximide systemic multi-site (2) low  
kresoxim-methyl (Sovran) Qol5 systemic2 single-site (11) high  
mancozeb (Dithane) carbamate (EBDC)6 contact multi-site (M3) low  
maneb carbamate (EBDC)6 contact multi-site (M3) low  
mefenoxam (Ridomil Gold) phenylamide systemic single-site (4) high  
myclobutanil (Rally) DMI3-triazole systemic2 single-site (3) high  
neem oil (Trilogy) plant oil contact various (—) low  
oil (JMS stylet oil) mineral oil contact various (—) low  
potassium bicarbonate (Armicarb, Kaligreen, Milstop) inorganic salt contact various (—) low  
pyraclostrobin/boscalid (Pristine) Qol5/carboxamide systemic2 single-site (11/7) high  
quinoxyfen (Quintec) quinoline contact single-site (13) medium  
sulfur inorganic contact multi-site (M2) low highly toxic to native strains of western predatory mite (Galendromus occidentalis) and parasites.
tebuconazole (Elite) DMI3-triazole systemic2 single-site (3) high  
triadimefon (Bayleton) DMI3-Triazole systemic2 single-site (3) high  
trifloxystrobin (Flint) Qol5 systemic2 single site (11) high  
triflumizole (Procure) DMI3-imidazole systemic2 single-site (3) high  
ziram carbamate (DMDC)7 contact multi-site (M3) low  
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 Generally considered to have systemic action based on performance data but has not been proven experimentally.
3 DMI = demethylation (sterol) inhibitor
4 SAR = systemic aquired resistance induced in host
5 Qol = quinone outside inhibitor (strobilurin)
6 EBDC = ethylene bisdithiocarbamate
7 DMDC = dimethyl dithiocarbamates
— = unknown

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448
General Information
Acknowledgment: Adaskaveg et al. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops. For the most current information see the 2012 edition (PDF).

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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