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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Almond

General Properties of Fungicides Used in Almonds

(Reviewed 3/09, updated 3/09)

In this Guideline:
Common name
(trade name)		 Chemical class1 Activity Mode of action (FRAC1 No.) Resistance potential Comments
azoxystrobin (Abound) strobilurin contact, systemic single-site (11) high some populations of pathogens have been found to be resistant to strobilurins
boscalid/pyraclostrobin (Pristine) carboxyanilide/ stro-bilurin contact, systemic multi-site (7/11) medium  
captan phthalamide contact multi-site (M4) low highly toxic to honey bee larvae
chlorothalonil (Bravo) aromatic nitrile contact multi-site (M5) low  
copper inorganic contact multi-site (M1) low  
cyprodinil (Vangard) anilinopyrimidine mostly contact single-site (9) high more effective in spring than summer
fenhexamid (Elevate) hydroxyanilide contact single-site (17) high  
fosetyl-al (Aliette) phosphorothiolate systemic — (33) —  
iprodione (Rovral) dicarboximide systemic (local) multi-site (2) low  
maneb (Maneb, Manex) carbamate (EBDC) 3 contact multi-site (M3) low  
mefenoxam (Ridomil Gold) acylalanine contact, systemic single-site (4) high  
myclobutanil (Laredo) DMI 2-triazole systemic (local) single-site (3) high  
phosphites (Fosphite) phosphonates systemic — —  
propiconazole (Break/Orbit) DMI 2-triazole systemic (local) single-site (3) high  
pyraclostrobin (Pristine) strobilurin systemic? single-site (11) high some populations of pathogens have been found to be resistant to strobilurins
sulfur inorganic contact multi-site (M2) low highly toxic to native strains of western predatory mite (Galendromus occidentalis) and to parasites
thiophanate-methyl (Topsin) benzimidazole systemic (local) single-site (1) very high resistant populations do not decline in absence of Topsin use.
trifloxystrobin (Flint) strobilurin systemic? single-site (11) high  
ziram carbamate (DMDC)4 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 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 DMI = demethylation (sterol) inhibitor
3 EBDC = ethylene bisdithiocarbamate
4 DMDC = dimethyl dithiocarbamate
— = no information

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Almond
UC ANR Publication 3431
General Information
Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2008. Fungicide Efficacy and Timing for Deciduous Tree Fruit and Nut Crops and Grapevines (932 KB, PDF)

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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