How to Manage Pests

UC Pest Management Guidelines


General Properties of Fungicides Used in Plums

(Reviewed 5/06, updated 4/09, corrected 6/17)

In this Guideline:

Common name
(trade name)
Chemical class
(FRAC No.)1
Activity Mode of action Resistance potential Comments
azoxystrobin (Abound) QoI3 (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) chloronitrile (M5) contact multi-site low  
copper inorganic (M1) contact multi-site low  
cyprodinil (Vangard) anilinopyrimidine (9) mostly contact single-site high  
fosetyl-al (Aliette) ethyl phosphonate (33) systemic unknown low  
fludioxonil (Scholar) phenylpyrrole (12) contact few to multi-site medium  
iprodione (Rovral) dicarboximide (2) systemic (local) single-site? medium toxic to honey bee larvae
mefenoxam (Ridomil Gold) acylalanine (4) contact, systemic single-site high  
myclobutanil (Rally) DMI2-triazole (3) systemic (local) single-site high  
propiconazole (Bumper/Orbit) DMI2-triazole (3) systemic (local) single-site high  
pyraclostrobin/boscalid (Pristine) QoI3 / SDHI4 (11 / 7) contact, systemic single-site / single-isite high  
pyrimethanil (Scala) anilinopyrimidine (9) mostly contact single-site 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) MBC5 (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 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 QoI = quinone outside inhibitor (strobilurin)
4 SDHI= succinate dehydrogenase inhibitor
5 MBC= methyl benzimidazole carbamate



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Plum
UC ANR Publication 3462

General Information

Acknowledgment: Adaskaveg et al., 2017. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops. (PDF)

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