How to Manage Pests

UC Pest Management Guidelines

Peach

General Properties of Fungicides Used in Peaches

(Reviewed 4/10, updated 5/12)

In this Guideline:


Common name
(trade name)
Chemical class Activity Mode of action
(Group #)1
Resistance potential Comments
azoxystrobin (Abound) Qol2 contact, systemic single-site (11) high
bordeaux inorganic contact multi-site (M1) low  
captan phthalamide contact multi-site (M4) low highly toxic to honey bee larvae
chlorothalonil (Bravo, etc.) chloronitrile contact multi-site (M5) low  
copper inorganic contact multi-site (M1) low  
cyprodinil (Vangard) anilinopyrimidine mostly contact single-site (9) high  
dicloran (Botran) aromatic hydrocarbon systemic (local) single-site (14) medium  
dodine (Syllit) guanidine systemic (local) unknown (U12) medium  
fenbuconazole (Indar) DMI3-triazole systemic (local) single-site (3) high  
fenhexamid (Elevate) hydroxyanilide contact single-site (17) high  
fosetyl-al (Aliette) ethyl phosphonate systemic unknown (33) low  
iprodione (Rovral, etc.) dicarboximide systemic (local) single-site? (2) medium toxic to honey bee larvae
mefenoxam (Ridomil Gold) acylalanine contact, systemic single-site (4) high  
metconazole (Quash) DMI3-triazole systemic (local) single-site (3) high  
myclobutanil (Rally) DMI3-triazole systemic (local) single-site (3) high  
propiconazole (Bumper/Tilt) DMI3-triazole systemic (local) single-site (3) high  
pyraclostrobin/boscalid (Pristine) Qol2/SDHI5 contact, systemic single-site/single-site (11/7) high  
pyrimethanil (Scala) anilinopyrimidine mostly contact single-site (9) high  
quinoxyfen (Quintec) quinoline contact single-site (13) medium  
sulfur inorganic contact multi-site (M2) low highly toxic to native strains of western predatory mite (Galendro–mus occidentalis) and to parasites
tebuconazole (Elite, etc.) DMI3-triazole systemic (local) single-site (3) high  
tebuconazole/trifloxystrobin (Adament) DMI3-triazole/Qol2 systemic single-site/ single-site (3/11) medium  
thiophanate-methyl (Topsin, etc.) MBC6 systemic (local) single-site (1) very high  
thiram (Thiram Granuflo) carbamate (DMDC4) contact multi-site (M3) low  
trifloxystrobin (Gem) Qol2 contact, systemic7 single-site (11) high8  
ziram carbamate (DMDC4) contact multi-site (M3) low  
= no information
 
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 Qol = quinone outside inhibitor (strobilurin)
3 DMI = demethylation (sterol) inhibitor
4 DMDC = dimethyl dithiocarbamate
5 SDHI = Succinate dehydrogenase inhibitor
6 MBC = Methyl benzimidazole carbamate
7 Fungicide is generally considered to have systemic action based on performance data, but this characteristic has not been necessarily proven experimentally using more rigorous assays (e.g. radioactively labeled compounds).
8 Resistance has been found in California for certain fungicides with a single-site mode of action. To reduce the risk of resistance development, take the mode of action into account when choosing a fungicide. At the beginning of a treatment program, use a fungicide with a multi-site mode of action; for subsequent applications rotate or mix fungicides with different mode of action FRAC numbers. Use labeled rates (preferably the upper range) of the single-site fungicides, and limit the total number of applications/season.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Peach
UC ANR Publication 3454

General Information

Acknowledgment: Adaskaveg et al., 2015. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops. (PDF)

Top of page


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2016 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/r602900211.html revised: March 11, 2016. Contact webmaster.