How to Manage Pests

UC Pest Management Guidelines

Almond

General Properties of Fungicides Used in Almonds

(Reviewed 3/09, updated 11/12)

In this Guideline:


Common name
(example trade name)
Chemical class1 Activity Mode of action (FRAC1 No.) Resistance potential Comments
azoxystrobin (Abound) Qol2 contact, systemic single-site (11) high some populations of Fusicladium sp. (scab) and Alternaria sp. have been found to be resistant to Qol fungicides
azoxystrobin/difenoconazole (Quadris Top) QoI2/DMI3 contact, systemic multi-site (3/11) medium  
azoxystrobin/propiconazole (Quilt Xcel) QoI2/DMI3 contact, systemic multi-site (3/11) medium  
boscalid/pyraclostrobin (Pristine) SDHI4 pyridine-carboxamide/Qol2 contact, systemic multi-site (7/11) medium some populations of Fusicladium sp. (scab) and Alternaria sp. have been found resistant to QoI2 and SDHI4 fungicides
captan phthalamide contact multi-site (M4) low highly toxic to honey bee larvae
chlorothalonil (Bravo/Echo/Equus/Chlorothalonil) 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
fenbuconazole (Indar) DMI3 systemic single-site (3) high  
fenhexamid (Elevate) hydroxyanilide contact single-site (17) high  
fluopyram/tebuconazole (Luna Experience) SDHI4 pyridinyl-ethyl-benzamide/DMI3 contact, systemic multi-site (7/11) medium some populations have been found resistant to SDHI4 fungicides
fluopyram/trifloxystrobin (Luna Sensation) SDHI4 pyridinyl-ethyl-benzamide/QoI2 contact, systemic multi-site (7/11) medium some populations have been found resistant to QoI2 and SDHI4 fungicides
fosetyl-al (Aliette) phosphorothiolate systemic — (33)  
iprodione (Rovral, Nevado/Meteor) dicarboximide systemic (local) multi-site (2) low  
mancozeb* (Dithane, Manzate) carbamate (EBDC) 5 contact multi-site (M3) low  
metconazole (Quash) DMI3 systemic single-site (3) high  
mefenoxam (Ridomil Gold) acylalanine contact, systemic single-site (4) high  
myclobutanil (Laredo) DMI 3-triazole systemic (local) single-site (3) high  
phosphites (Fosphite) phosphonates systemic multi-site? (33) low  
polyoxin-D (Ph-D) polyoxin contact single-site (19) high  
propiconazole (Tilt/Bumper) DMI3-triazole systemic (local) single-site (3) high  
pyrimethanil (Scala) anilinopyrimidine mostly contact single-site (9) high more effective in spring than summer
sulfur inorganic contact multi-site (M2) low highly toxic to native strains of western predatory mite (Galendromus occidentalis) and to parasites
thiophanate-methyl (Topsin-M/T-Methyl) MBC6 systemic (local) single-site (1) very high resistant populations do not decline in absence of Topsin use.
trifloxystrobin (Gem) Qol2 systemic? single-site (11) high  
tebuconazole (Tebuzol) DMI-triazole systemic Single-site (3) high  
ziram carbamate (DMDC)7 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 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 or strobilurin
3 DMI = demethylation (sterol) inhibitor
4 SDHI = succinate dehydrogenase inhibitor
5 EBDC = ethylene bisdithiocarbamate
6 MBC = methyl benzimidazole
7 DMDC = dimethyl dithiocarbamate
—  = no information

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Almond
UC ANR Publication 3431

General Information

Acknowledgment: Adaskaveg et al. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops. For the most current information see the 2012 edition (PDF).

Top of page

PDF: To display a PDF document, you may need to use a PDF reader.


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/r3900411.html revised: July 24, 2014. Contact webmaster.