How to Manage Pests

UC Pest Management Guidelines


General Properties of Fungicides Used in Tomatoes

(Reviewed 12/13, updated 12/13)

In this Guideline:

Common name (example trade name) Chemical class (FRAC No.)1 Activity Mode of action Resistance potential
azoxystrobin (Quadris) QoI2 (11) contact, systemic single-site high
azoxystrobin + difenoconazole (Quadris Top) Qol2 + DMI3-triazole (11 + 3) contact, systemic single-site + single site low
Bacillus pumilus (Sonata) biological (—) contact multi-site low
Bacillus subtilis (Serenade) biological (—) contact multi-site low
chlorothalonil (Bravo) chloronitrile (M5) contact multi-site low
copper inorganic (M1) contact multi-site low
dimethomorph (Zampro) cinnamic acid (40) systemic medium
famoxadone + cymoxanil (Tanos) QoI2 + cyanoacetamide-oximes (11 + 27) systemic multi-site low
fluxapyroxad + pyraclostrobin (Priaxor) SDHI4 + QoI2 (7 + 11) systemic single-site medium
mancozeb (Dithane) dithiocarbamate (M3) contact multi-site low
mefenoxam (Ridomil Gold) phenylamide (4) systemic single-site high
myclobutanil (Rally) DMI3-triazole (3) systemic (local) single-site high
penthiopyrad (Fontelis) SDHI4 (7) systemic (local) single-site high
pyraclostrobin (Cabrio) QoI2 (11) systemic single-site medium
sulfur inorganic (M2) contact multi-site low
trifloxystrobin (Flint) QoI2 (11) contact and systemic (local) single-site high
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 QoI = quinone outside inhibitor (strobilurin)
3 DMI = demethylation (sterol) inhibitor
4 SDHI = succinate dehydrogenase inhibitor
  —= not known



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Tomato
UC ANR Publication 3470

General Information

Acknowledgments: Adaskaveg et al., 2005. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut Crops, and Grapevines. This information was adpated from the Fungicide Resistance Action Committee (FRAC) Web site (

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