How to Manage Pests

UC Pest Management Guidelines

Pear

General Properties of Fungicides Used in Pears

(Reviewed 11/12 , updated 11/12 )

In this Guideline:


Common name (trade name) Chemical class Activity Mode of action (FRAC number)1 Resistance potential Comments
Aureobasidium pullulans (Blossom Protect) fermentation product antagonist various (—) low  
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  
difenoconazole/cyprodinil (Inspire Super) DMI2/anilinopyrimidine systemic two, single-site modes of action (3/9) high  
dodine (Syllit) guanidine systemic few to multi-site (M7) medium slow resistance by limiting applications to one per season or tank mixing with another fungicide
fenarimol (Rubigan, Vintage) 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, Penncozeb, Manzate) carbamate (EBDC)4 contact multi-site (M3) low  
oxytetracycline (Mycoshield, Fireline) antibiotic systemic protein synthesis (41) high  
Pantoea agglomerans (Bloomtime Biological) fermentation product antagonist various (—) low  
Pseudomonas fluorescens (Blight Ban) fermentation product antagonist various (—) low  
pyrimethanil (Scala) anilinopyrimidine mostly contact: slightly systemic single-site (9) high  
pyraclostrobin/boscalid (Pristine) Qol3/SDHI7 systemic two, single-site modes of action (7/11) medium  
streptomycin (Ag-Streptomycin, Agri-Mycin, Firewall) antibiotic systemic protein synthesis (25) high  
sulfur inorganic contact multi-site (M2) low toxic to predatory mites and parasites
tebuconazole (Tebuzol) DMI2 systemic single-site (3) high  
tebuconazole/ trifloxystrobin (Adament) DMI2/Qol3 systemic two, single-site modes of action (3/11) medium  
thiophanate-methyl (Topsin-M, T-Methyl, Incognito) benzimidazole systemic single-site (1) very high Toxic to earthworms with repeated usage
tridemefon (Bayleton) DMI2 systemic single-site (3) 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 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.
7 SDHI= succinate dehydrogenase inhibitor
No information

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Pear
UC ANR Publication 3455

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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