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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Nectarine

2009 Fungicide Efficacy and Treatment Timing

(Reviewed 3/09, updated 3/09)

In this Guideline:

FUNGICIDE EFFICACY FOR NECTARINE DISEASES

Fungicide Resistance risk (FRAC#)1 Brown rot2 Powdery mildew2 Scab Rust Leaf curl Shot hole
Blossom Fruit
Adament medium (3/11)              
Benlate3 high (1) ++++ ++++ +++ +++ + ---- ----
Distinguish* medium (9/11) ++++ +++ ++ +++ +++ ---- ++
Elite/Orius/Tebuzol high (3) ++++ ++++ +++ ++ +++ ---- +
Indar/Enable4 high (3) ++++ ++++ +++ +++ ND ---- +/-
Orbit (Bumper) high (3) ++++ ++++ +++ ---- +++ ---- +/-
Pristine medium (7/11)5 ++++ ++++ +++ +++ ND ND ++++
Rovral6+ oil7 low (2) ++++ NR + + ++ ---- ++
Scala8 high (9)5 ++++ +++8 ND ND ND ---- +
Topsin-M/T-Methyl/Thiophante-Methyl3 high (1)5 ++++ ++++ +++ +++ + ---- ----
Vangard high (9)5 ++++ +++8 ND ND ND ---- +
Elevate high (17)5 +++ +++ ND ND ND ND ND
Rally high (3) +++ +++ ++++ ---- ---- ---- ----
Rovral/Iprodione/Nevado6 low (2) +++ NR ---- ---- ---- ---- ----
Abound high (11)5 ++ + ++ ++++ +++ ---- ++
Botran medium (14) ++ + ND ND ND ND ND
Bravo/Chlorothalonil/Echo/Equus9,10 low (M5) ++ ---- ---- +++ + +++ +++
Captan10 low (M4) ++ ++ ---- +++ ---- ---- +++11
Gem high (11)5 ++ + ++ ++++ +++ ---- ++
Syllit medium (M7) ND ---- —- ND ---- + ----
Copper low (M1) +/- ---- ---- ---- ---- +++ +++
Sulfur10 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 NR = not registered
* Registration pending.
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 Benlate (label withdrawn), 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.
4 Indar is registered; registration for Enable pending in California.
5 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.
6 Blossom blight only; not registered for use after petal fall.
7 Oil is a “light” summer oil, 1-2% volume/volume.
8 High summer temperatures and relative humidity reduce efficacy.
9 Do not use after jacket (shuck) split.
10 Do not use in combination with or shortly before or after oil treatment.
11 Not effective if used as a dormant treatment.

FUNGICIDE TREATMENT TIMING IN NECTARINE

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.
1 Timing not exact; weather conditions determine need for treatment.
2 Apply until pit hardening.
3 Treatment should be made before bud break and preferably before bud swell.
4

Dormant treatment with liquid lime sulfur.
5 Fall 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.

Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2009. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (960 KB, PDF)

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Nectarine
UC ANR Publication 3451
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Statewide IPM Program, Agriculture and Natural Resources, University of California
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