How to Manage Pests

UC Pest Management Guidelines


General Properties of Fungicides

(Reviewed 11/07, updated 2/09)

In this Guideline:

Caution: Never apply sulfur to apricot trees or captan to apricot fruit.

Common name (trade name) Chemical class Activity Mode of action (FRAC Group No. 1) Resistance potential Comments
azoxystrobin (Abound) QoI2 contact, systemic single-site (11) high3  
bordeaux inorganic contact multi-site low  
captan phthalamide contact multi-site (M4) low highly toxic to honey bee larvae
chlorothalonil (Bravo/Echo) chloronitrile contact multi-site (M5) low  
copper inorganic contact multi-site (M1) low  
cyprodinil (Vangard) anilinopyrimidine mostly contact single-site (9) high3  
dichloran (Botran) aromatic hydrocarbon systemic (local) single-site (14) high  
fenbuconazole (Indar) DMI4-triazole systemic (local) single-site (3) high  
fenhexamid (Elevate) hydroxyanilide contact single-site (17) high3  
fosetyl-al (Aliette) phosphonate systemic multi-site (33) low  
iprodione (Rovral) dicarboximide systemic (local) multi-site (2) low  
mefenoxam (Ridomil Gold) phenylamide systemic single-site (4) high3  
myclobutanil (Rally) DMI4-triazole systemic (local) single-site (3) high  
phosphorus acid (Fosphite) phosphonate systemic multi-site (33) low  
propiconazole (Bumper/Orbit) DMI4-triazole systemic (local) single-site (3) high  
pyraclostrobin/boscalid (Pristine) QoI2/carboxyanilide systemic single-site/multi-site (11/7) high/ low  
pyrimethanil (Scala) anilinopyrimidine mostly contact; slight systemic single-site (9) high  
thiophanate-methyl (Topsin M) benzimidazole systemic (local) single-site (1) very high  
trifloxystrobin (Flint) Qol2 systemic5 single-site (11) high  
ziram carbamate (DMDC6) 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 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 SAR = systemic acquired resistance induced in host
4 DMI = demethylation (sterol) inhibitor
5 Generally considered to have systemic action based on performance data but has not been proven experimentally.
6 DMDC = dimethyl dithiocarbamate



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Apricot
UC ANR Publication 3433

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).

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