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UC Pest Management Guidelines


Lettuce

General Properties of Fungicides

(Reviewed 8/07, updated 10/09)

In this Guideline:


Common name
(trade name)
Chemical class Activity Mode of action(FRAC number) 1 Resistance Comments
acibenzolar-S-methyl (Actigard) quinone inside inhibitor — (21)
azoxystrobin (Quadris) QoI2 systemic3 single-site (11) high
boscalid (Endura) carboxyanilide systemic3 multi-site (7) low
copper inorganic contact multi-site (M1) low
cyprodinil/fludioxonil (Switch) anilinopyrimidine/phenylpyrrole — (9/12)
dichloran (Botran) aromatic hydrocarbon systemic (local) single site (14) high
dimethomorph (Acrobat) carboxylic acid amide — (40)
famoxadone/cymoxanil (Tanos) QoI2/cyanoacetamide-oximes — (11/27)
fenamidone (Reason) QoI2 systemic3 single-site (11) high
fluopicolide (Presidio) benzamide — (43)
fosetyl-al (Aliette) phosphonate systemic multi-site (33) low
iprodione (Rovral) dicarboximide systemic multi-site (2) low toxic to honey bee larvae; do not apply during bloom.
mandipropamid (Revus) carboxylic acid amide — (40)
maneb carbamate (EBDC)4 contact multi-site (M3) low
mefenoxam (Ridomil Gold) phenylamide systemic single-site (4) high
phosphorus acid (Fosphite) phosphonate — (33)
sulfur inorganic contact multi-site (M2) low toxic to predatory mites and parasites.
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. For fungicides with mode of action Group numbers 1, 4, 9, 11, or 17, make no more than one application 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 Generally considered to have systemic action based on performance data but has not been proven experimentally.
4 EBDC = ethylene bisdithiocarbamate

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Lettuce
UC ANR Publication 3450
General Information
Acknowledgment: This information was adapted from the Fungicide Resistance Action Committee Web site (http://www.frac.info).

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