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How to Manage Pests

UC Pest Management Guidelines


Small Grains

General Properties of Fungicides Used in Small Grains

(Reviewed 2/07, updated 2/09)

In this Guideline:


Common name
(trade name)
Chemical class Activity Mode of action
group no.1
Resistance potential
azoxystrobin (Quadris QoI2 systemic 11 (single-site) high
carboxin (Vitavax) carboxamide systemic (local) 7 (multi-site) low
difenoconazole (Dividend) DMI3-triazole systemic (local) 3 (single-site) high
mancozeb (Dithane) carbamate (EBDC)4 contact M2 (multi-site) low
PCNB aromatic hydrocarbon systemic (slight) 14 (single-site) high
propiconazole (Tilt) DMI3-triazole systemic (local) 3 (single-site) high
pyraclostrobin (Headline) QoI2 systemic 11 (single-site) high
carboxin (Vitavax) carboxamide systemic (local) 7 (multi-site) low
tebuconazole (Raxil) DMI3-triazole systemic (local) 3 (single-site) high
thiram dithiocarbamates M2 (multi-site) low
triadimenol (Baytan) DMI3-triazole systemic (local) 3 (single-site) high
trifloxystrobin/ propicanazole (Stratego) QoI2/DMI3-triazole systemic 11/3 (multi/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 a fungicide with a different mode of action Group number.
2 QoI = quinone outside inhibitor (strobilurin)
3 DMI = demethylation (sterol) inhibitor
4 EBDC = ethylene bisdithiocarbamate
= unknown

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Small Grains
UC ANR Publication 3466
General Information
Acknowledgment: This information was adapted from the Fungicide Resistance Action Committee Web site (http://www.frac.info).

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