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How to Manage Pests

UC Pest Management Guidelines

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Cherry

2010 Fungicide Efficacy and Treatment Timing

(Reviewed 3/10, updated 5/10)

In this Guideline:

FUNGICIDE EFFICACY FOR CHERRY DISEASES

Fungicide Resistance risk (FRAC#)1 Brown rot2 Botrytis Blossom/Fruit Powdery mildew2 Shot hole/ Leaf spot3 Eutypa
Blossom Fruit
Adament medium (3/11) ++++ ++++ ++ +++ ND ----
Bumper/Tilt high (3) ++++ ++++ ---- +++ ND ----
Elite/Orius/Tebuzol high (3) ++++ ++++12 ++ ++ ND ----
Indar (Enable*) high (3) ++++ +++ ---- +++ ND ----
Luna Sensation* medium (7/11)5 ++++ ++++ +++ +++ ND ----
Pristine medium (7/11)5 ++++ ++++ +++ +++ ND ----
Quash high (3) ++++ ++++ ---- +++ ND ----
Quadris Top* medium (3/11) ++++ ++++ ++ +++ ND ----
Quilt Xcel* medium (3/11) ++++ ++++ ++ +++ ND ----
Rovral6 + oil7 low (2) ++++ NL ++++ ++ ND ----
Topsin-M/T-Methyl/ Thiophanate-Methyl4 high (1)5 ++++ NL ++++ +++ ND +++4
Abound high (11)5 +++ + ---- ++ ND ----
Cabrio high (11)5 +++ ++ ---- ++ ND ----
Elevate high (17)5 +++ +++ ++++ + ND ----
Gem high (11)5 +++ ++ ---- ++ ND ----
Procure8 high (3) +++ +++ ---- ++++ ND ----
Quintec medium (13) ND ND ND ++++ ND ----
Rally8 high (3) +++ +++ ---- ++++ ND ----
Rovral, Iprodione, Nevado6 low (2) +++ NL +++ ---- ND ----
Rubigan high (3) +++ +++ ---- ++++ ND ----
Botran medium (14) ++ ++ +++ ---- ND ----
Bravo/Chlorothalonil/Echo /Equus9,10 low (M5) ++ NL ++ ---- ND ----
Captan10 low (M4) ++ ++ ++ ---- ND ----
Copper low (M1) +/- ---- ---- ---- ND ----
Sulfur10 low (M2) +/- ---- ---- +++ ND ----
Ziram low (M3) +/- NL ---- ---- ND ----
Rating: ++++ = excellent and consistent, +++ = good and reliable, ++ = moderate and variable, + = limited and/or erratic, +/- = minimal and often ineffective, ---- = ineffective, ND = no data, NL = not on label, and ? = insufficient data or unknown
* Registration pending in California.
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 the same fungicide or fungicides with similar chemistry more than twice in one year.
3 Shot hole and leaf spot occur infrequently on cherry in California; control usually is not necessary.
4 Strains of Monilinia fructicola resistant to Topsin-M and T-Methyl are present in some California cherry 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 sweet cherry with overuse of fungicides with similar chemistry.
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 to use is a "light" summer oil, 1-2% volume/volume.
8 More effective when applied as a concentrate (80-100 gal/acre) than as a dilute spray.
9 Do not use after jacket (shuck) split.
10 Do not use in combination with or shortly before or after oil treatment.

FUNGICIDE TREATMENT TIMING IN CHERRIES

Note: Not all indicated timings may be necessary for disease control.

Disease Late
budbreak 		Popcorn Full bloom Petal fall 2-3 weeks
later 		Preharvest
1-10 days
Botrytis — +++ +++ ++ — +++
brown rot 2 — +++ +++ ++ — +++
powdery mildew ++3 ++ +++ +++ +++ +
Rating: +++ = most effective;   ++ = moderately effective;  — = ineffective
1 Select broad-spectrum fungicides (or combinations) that have activity against both brown rot and Botrytis fruit rots.
2 Begin at popcorn and repeat every 10 to 14 days through bloom if rains continue.
3 Use sulfur at late bud break; use other fungicides for later treatment. Treat immediately if mildew is found on shoots or leaves on inner scaffolds.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Cherry
UC ANR Publication 3440
General Information
Acknowledgment: Adaskaveg et al., 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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