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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Pear

General Properties of Fungicides Used in Pears

(Reviewed 2/07, updated 2/09)

In this Guideline:
Common name (trade name) Chemical class Activity Mode of action (FRAC number)1 Resistance potential Comments
Bacillus subtillis (Serenade Max) fermentation product contact various (—) low  
bordeaux inorganic contact multi-site (M1) low  
copper inorganic contact multi-site (M1) low  
cyprodinil (Vangard) anilinopyrimidine mostly contact; slightly systemic single-site (9) high  
dodine (Syllit) guanidine systemic few to multi-site (M7) medium  
fenarimol (Rubigan) DMI2-pyrimidine systemic6 single-site (3) high  
fosetyl-al (Aliette) phosphonate systemic multi-site (33) low  
kresoxim-methyl (Sovran) QoI3 systemic6 single-site (11) high  
lime sulfur inorganic contact multi-site (M2) low incompatible with most other pesticides
mancozeb (Dithane) carbamate (EBDC)4 contact multi-site (M3) low  
oxytetracycline (Mycoshield) antibiotic systemic protein synthesis (41) high  
pyrimethanil (Scala) anilinopyrimidine mostly contact: slightly systemic single-site (9) high  
streptomycin (Agri-Mycin) antibiotic systemic protein synthesis (25) high  
sulfur inorganic contact multi-site (M2) low toxic to predatory mites and parasites
thiophanate-methyl (Topsin-M) benzimidazole systemic single-site (1) very high  
trifloxystrobin (Flint) QoI3 systemic6 single-site (11) high  
triflumizole (Procure) DMI2-imidazole systemic6 single-site (3) high  
ziram carbamate (DMDC)5 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 QoI= quinone outside inhibitor (strobilurin)
4 EBDC= ethylene bisdithiocarbamate
5 DMDC= dimethyl dithiocarbamate
6 Generally considered to have systemic action based on performance data but not yet proven experimentally.
— No information

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Pear
UC ANR Publication 3455
General Information
Acknowledgment: Adaskaveg et al., 2008. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (932KB, PDF).

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