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Peach

2012 Fungicide Efficacy and Treatment Timing

(Reviewed 4/10, updated 5/12)

In this Guideline:

FUNGICIDE EFFICACY FOR PEACH DISEASES

Fungicide Resistance risk (FRAC#)1 Brown rot2 Powdery mildew2 Scab Rust Leaf curl Shot hole
Blossom Fruit
Adament medium (3/11) ++++ +++ +++ ---- +++ ---- +/-
Bumper/Tilt high (3) ++++ ++++ +++ ++ +++ ---- +/-
Distinguish** medium (9/11) ++++ +++ ++ +++ +++ ---- ++
Elite**/Orius/Tebuzol high (3) ++++ ++++ +++ ++ +++ ---- +
Indar high (3) ++++ ++++ +++ ++ ND ---- +/-
Inspire Super high (3/9) ++++ ++++ +++ ++ ND ---- +/-
Quash high (3) ++++ ++++ +++ ND +++ ---- +++10,12
Pristine medium (7/11)4 ++++ ++++ +++ +++ ND ND ++++10,12
Luna Sensation* medium (7/11)4 ++++ ++++ +++ +++ ---- ND ++++10,12
Luna Experience* medium (3/7) ++++ ++++ +++ ---- +++ ---- +/-
Quadris Top medium (3/11) ++++ ++++ +++ ---- +++ ---- +/-
Quilt Xcel medium (3/11) ++++ ++++ +++ ---- +++ ---- +/-
Rovral5+ oil6 low (2) ++++ NL + + ++ ---- ++
Scala7 high (9)3,4 ++++ +++7 ND ND ND ---- +
Topsin-M /T-Methyl/Incognito high (1)3,4 ++++ ++++ +++ +++ + ---- ----
Vangard7 high (9)3,4 ++++ +++7 ND ND ND ---- +
Fontelis* high (7)4 ++++ +++ ++++ +++ ND ---- +++10,12
Elevate high (17)4 +++ +++ ND ND ND ND ND
Rally high (3) +++ +++ ++++ ---- ---- ---- ----
Rovral/Iprodione /Nevado5 low (2) +++ NL ---- ---- ---- ---- ----
Abound high (11)4 ++ + ++ ++++ +++ ---- ++
Botran medium (14) ++ + ND ND ND ND ND
Bravo/Chlorothalonil /Echo/Equus8,9 low (M5) ++ ---- ---- +++ + +++ +++
Captan9 low (M4) ++ ++ ---- +++ ---- ---- +++10,12
Gem high (11)4 ++ + ++ ++++ +++ ---- ++
Quintec high (13) ---- ---- ++++ ---- ---- ---- ----
Syllit11 medium (M7) + ---- ----- +++ ---- ++++ +++
Copper low (M1) +/- ---- ---- ---- ---- +++ +++
Sulfur9 low (M2) +/- +/- +++ +++ +++ ---- ----
Thiram low (M3) +/- ---- ---- +++ ---- ++++ +++
Ziram low (M3) +/- ---- ---- +++ ---- ++++ +++
Rating: ++++ = excellent and consistent, +++ = good and reliable, ++ = moderate and variable, + = limited and/or erratic, +/- = minimal and often ineffective, ---- = ineffective, ND = no data, and NL = not on label
* Registration pending in California.
**Not registered, label withdrawn or inactive
**** - Postharvest fruit registrations include: Allisan, Judge, Penbotec, Scholar, and Mentor (Section 18).
1Group 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.
2Do not use fungicides with the same FRAC number and high resistance risk more than twice in one year.
3Strains of Monilinia fructicola resistant to Topsin-M and T-Methyl are present in some peach and nectarine orchards. Resistant strains of the jacket rot fungus, Botrytis cinerea, and powdery mildew fungi have been reported in California on crops other than almond and stone fruits and may have the potential to develop in peach and nectarine with overuse of fungicides with similar chemistry. Sub-populations of both Monilinia spp. have been shown to be resistant to AP (FRAC 9) fungicides on prune in CA.
4 To reduce the risk of resistance development start treatments with a fungicide with a multi-site mode of action; rotate or mix fungicides with different mode of action FRAC numbers for subsequent applications, use labeled rates (preferably the upper range), and limit the total number of applications/season.
5Blossom blight only; not registered for use after petal fall.
6Oil is a "light" summer oil, 1-2% volume/volume.
7High summer temperatures and relative humidity reduce efficacy.
8Do not use after jacket (shuck) split.
9Do not use in combination with or shortly before or after oil treatment.
10Not effective if used as a dormant treatment.
11 For use on peach only; not registered on nectarine.
12 For shot hole management, dormant treatments with copper, ziram, and dodine are highly effective. Petal fall treatments should be used to complement the management program.

FUNGICIDE TREATMENT TIMING IN PEACH

Note: Not all indicated timings may be necessary for disease control.
Disease Dormant Bloom 3-6 weeks postbloom Preharvest1
20-40% 80-100% 3 weeks 1 week
Brown rot ---- ++ +++ + ++ +++
Powdery mildew ----/ND ++ +++ +++2 ---- ----
Leaf curl3 +++ + ---- ---- ---- ----
Rust +4 ---- ---- +++ ++ ----
Scab ---- + ++ +++ ---- ----
Shot hole5 +++ + + ++ ---- ----
Rating: +++ = most effective, ++ = moderately effective, + = least effective, ---- = ineffective, and ND = no data but needs to be evaluated.
1Timing not exact; weather conditions determine need for treatment.
2Apply until pit hardening.
3Treatment should be made before bud break and preferably before bud swell.
4Dormant treatment with liquid lime sulfur.
5Fall application before winter rains begin is the most important; additional spring sprays are seldom required but may be needed to protect the fruit if heavy persistent spring rains occur.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Peach
UC ANR Publication 3454
General Information
Acknowledgment: Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2012. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (PDF)

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