How to Manage Pests

UC Pest Management Guidelines


General Properties of Fungicides Used in Grapes

(Reviewed 12/14, corrected 6/17)

In this Guideline:

Common name (example trade name) Chemical class Activity Mode of action (FRAC Group No.1) Resistance potential Comments
azoxystrobin (Abound) QoI5 contact, systemic2 single-site (11) high  
Bacillus pumilis (Sonata) microbial contact various (44) low  
Bacillus subtilis (Serenade) microbial contact various (44) low  
captan phthalamide contact multi-site (M4) low highly toxic to honey bee larvae
copper inorganic contact multi-site (M1) low  
copper hydroxide inorganic contact multi-site (M1) low  
copper sulfate inorganic contact multi-site (M1) low  
cyflufenamid (Torino) phenylacetamide unknown (U6) high  
cyprodinil (Vangard) anilinopyrimidine mostly contact, slightly systemic single-site/ single-site (9 / 12) high  
cyprodinil / fludioxonil (Switch) anilinopyrimidine and phenylpyrrole contact, slightly systemic single-site (9 + 12) low to medium  
difenoconazole / azoxystrobin (Quadris Top) DMI3-triazole and QoI5 systemic (local) single-site/ single-site (3 / 11) medium to high  
difenoconazole / cyprodinil (Inspire Super) DMI3 and anilinopyrimidine contact, systemic single-site/ single-site (3 / 9) medium  
fenhexamid (Elevate) hydroxyanilide contact single-site (17) high  
fluopyram / tebuconazole (Luna Experience) SDHI6 pyridinyl-ethyl-benzamide and DMI3 contact, systemic single-site/ single-site (7 / 3) medium  
fungicidal soap (M-Pede) inorganic salt contact low  
iprodione (Rovral) dicarboximide systemic (local) single-site (2) medium  
kresoxim-methyl (Sovran) Qol5 contact, systemic2 single-site (11) high  
mancozeb (Dithane) dithiocarbamate contact multi-site (M3) low  
mefenoxam (Ridomil Gold) phenylamide contact, systemic single-site (4) high  
metrafenone (Vivando) benzophenone contact unknown (U8) high  
myclobutanil (Rally) DMI3-triazole systemic (local)2 single-site (3) high  
oil (JMS stylet oil) mineral oil contact various (NC) low  
potassium bicarbonate (Armicarb, Kaligreen, Milstop) inorganic salt contact various (NC) low  
pyraclostrobin / boscalid (Pristine) Qol5 and SDHI6 contact, systemic2 single-site/ single-site (11 / 7) high  
pyrimethanil (Scala) anilinopyrimidine mostly contact, slightly systemic single-site (9) high  
quinoxyfen (Quintec) aryloxyquinoline contact single-site (13) medium  
sulfur inorganic contact multi-site (M2) low highly toxic to native strains of western predatory mite (Galen-dromus occidentalis) and parasites.
tebuconazole (Elite) DMI3-triazole systemic (local)2 single-site (3) high  
tetraconazole (Mettle) DMI3-triazole systemic (local) single-site (3) high  
thiophanate-methyl (Topsin) MBC7 systemic (local) single-site (1) very high  
trifloxystrobin (Flint) Qol5 contact, systemic2 single site (11) high  
triflumizole (Procure) DMI3-imidazole systemic (local)2 single-site (3) high  
ziram dithiocarbamate 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 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 SDHI = succinate dehydrogenase inhibitor
7 MBC = methyl benzimidazole carbamate
= unknown
NC = not classified



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448

General Information

Acknowledgment: Adaskaveg et al., 2017. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (PDF).

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