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UC Pest Management Guidelines

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Peach

2010 Fungicide Efficacy and Treatment Timing

(Reviewed 4/10, updated 4/10)

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 (Enable*) high (3) ++++ ++++ +++ ++ ND ---- +/-
Inspire* high (3) ++++ ++++ +++ ++ ND ---- +/-
Inspire Super* high (3/9) ++++ ++++ +++ ++ ND ---- +/-
Quash high (3) ++++ ++++ +++ ND +++ ---- +
Pristine medium (7/11)4 ++++ ++++ +++ +++ ND ND ++++
Luna Sensation* medium (7/11)4 ++++ ++++ +++ +++ ---- ND ++++
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 /Thiophanate-Methyl high (1) 3,4 ++++ ++++ +++ +++ + ---- ----
Vangard7 high (9) 3,4 ++++ +++7 ND ND ND ---- +
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
Gem high (11)4 ++ + ++ ++++ +++ ---- ++
Quintec high (13) ---- ---- ++++ ---- ---- ---- ----
Syllit medium (M7) ND ---- ----- ND ---- + ----
Copper low (M1) +/- ---- ---- ---- ---- +++ +++
Sulfur9 low (M2) +/- +/- +++ +++ +++ ---- ----
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** Not registered, label withdrawn or inactive.
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 Do not use fungicides with the same FRAC number and high resistance risk more than twice in one year.
3 Strains 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.
5 Blossom blight only; not registered for use after petal fall.
6 Oil is a "light" summer oil, 1-2% volume/volume.
7 High summer temperatures and relative humidity reduce efficacy.
8 Do not use after jacket (shuck) split.
9 Do not use in combination with or shortly before or after oil treatment.
10 Not effective if used as a dormant treatment.

FUNGICIDE TREATMENT TIMING IN PEACH

Note: Not all indicated timings may be necessary for disease control.
Disease Dormant Bloom 3-6 weeks Preharvest1
20-40% 80-100% postbloom 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, ND= no data
1 Timing not exact; weather conditions determine need for treatment.
2 May need to continue treatments for powdery mildew longer than 6 weeks postbloom.
3 Treatment should be made before bud break and preferably before bud swell.
4 Dormant treatment with liquid lime sulfur.
5 Late fall/winter application is the most important timing; 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. 2010. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (1.1 MB, PDF)

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