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How to Manage Pests

UC Pest Management Guidelines

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Tomato

General Properties of Fungicides Used in Tomatoes

(Reviewed 1/08, updated 1/08)

In this Guideline:
Common name (trade name) Chemical class (FRAC No.)1 Activity Mode of action Resistance potential
azoxystrobin (Quadris) QoI2 (11) contact, systemic single-site high
Bacillus subtilis (Serenade) biological (—) contact multi-site low
chlorothalonil (Bravo) chloronitrile (M5) contact multi-site low
copper inorganic (M1) contact multi-site low
dimethomorph (Acrobat) cinnamic acid (40) systemic — medium
famoxadone/cymoxanil (Tanos) QoI2/cyanoacetamide-oximes (11/27) systemic multi-site low
mancozeb (Dithane) dithiocarbamate (M3) contact multi-site low
maneb 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
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 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 QoI = quinone outside inhibitor (strobilurin)
3 DMI = demethylation (sterol) inhibitor
— = not known

[Precautions]

PUBLICATION

[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 (http://www.frac.info/)

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