How to Manage Pests

UC Pest Management Guidelines


Prune

General Properties of Fungicides Used in Prunes

(Reviewed 6/06, updated 4/09)

In this Guideline:


Common name (trade name) Chemical class (FRAC #)1 Activity Mode of action Resistance potential Comments
azoxystrobin (Abound) strobilurin (11) contact, systemic single-site high  
bordeaux inorganic (M1) contact multi-site low  
captan phthalamide (M4) contact multi-site low highly toxic to honey bee larvae
chlorothalonil (Bravo) aromatic nitrile (M5) contact multi-site low  
cyprodinil (Vangard) anilinopyrimidine (9) mostly contact single-site high  
fenhexamid (Elevate) hydroxyanilide (17) contact single-site high  
fosetyl-al (Aliette) phosphorothiolate (33) systemic  
iprodione (Rovral) dicarboximide (2) systemic (local) multi-site low  
mefenoxam (Ridomil Gold) acylalanine (4) systemic single-site high  
myclobutanil (Rally) DMI 2-triazole (3) systemic (local) single-site high  
propiconazole (Break/Orbit) DMI 2-triazole (3) systemic (local) single-site high  
pyrimethanil (Scala) anilinopyrimidine (9) mostly contact single-site (9) high  
sulfur inorganic (M2) contact multi-site low highly toxic to native strains of western predatory mite (Galendromus occidentalis) and to parasites
thiophanate-methyl (Topsin) benzimidazole (1) systemic (local) single-site very 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 fungicide with a different mode of action Group number.
2  DMI = demethylation (sterol) inhibitor

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Prune
UC ANR Publication 3464
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).

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