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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Cherry

2008 Fungicide Efficacy and Treatment Timing

(Reviewed 2/08, updated 2/08)

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 —
Benlate4 high (1) ++++ ++++ ++++ +++ ND —
Elite high (3) ++++ ++++ ++ ++ ND —
Indar/Enable5 high (3) ++++ +++ — +++ ND —
Orbit (Bumper) high (3) ++++ ++++ — +++ ND —
Pristine medium (7/11)6 ++++ ++++ +++ +++ ND —
Rovral7 + oil8 low (2) ++++ NR ++++ ++ ND —
Topsin-M/T-Methyl4 high (1)6 ++++ NR ++++ +++ ND +++
Abound high (11)6 +++ + — ++ ND —
Cabrio high (11)6 +++ ++ — ++ ND —
Elevate high (17)6 +++ +++ ++++ + ND —
Gem high (11)6 +++ ++ — ++ ND —
Procure9 high (3) +++ +++ — ++++ ND —
Quintec medium (13) ND ND ND ++++ ND —
Rally9 high (3) +++ +++ — ++++ ND —
Rovral7 low (2) +++ NR +++ — ND —
Rubigan high (3) +++ +++ — ++++ ND —
Botran medium (14) ++ ++ +++ — ND —
Bravo/Chlorothalonil/
Echo10,11		 low (M5) ++ NR ++ — ND —
Captan11 low (M4) ++ ++ ++ — ND —
B-Lock — — — — — — +++
Copper low (M1) +/- — — — ND —
Sulfur11 low (M2) +/- — — +++ ND —
Ziram low (M3) +/- NR — — ND —
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, ? = insufficient data or unknown.
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4 Benlate label withdrawn. Strains of Monilinia fructicola resistant to Benlate, 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 Indar is registration; registration for Enable pending in California.
6 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.
7 Blossom blight only; not registered for use after petal fall.
8 Oil is a “light” summer oil, 1-2% volume/volume.
9 More effective when applied as a concentrate (80-100 gal/acre) than as a dilute spray.
10 Do not use after jacket (shuck) split.
11 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 bud break Popcorn Full bloom Petal fall 2-3 weeks later Preharvest
1-10 days1
Botrytis — +++ +++ ++ — +++
Brown rot2 — +++ +++ ++ — +++
Powdery mildew ++3 ++ +++ +++ +++ +
Rating: +++ = most effective, ++ = moderately effective, + = least effective, and — = 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, other fungicides for later treatment. Treat immediately if mildew is found on shoots or leaves on inner scaffolds.
Adapted from:
Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2008. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (932 KB, PDF)

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Cherry
UC ANR Publication 3440
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Statewide IPM Program, Agriculture and Natural Resources, University of California
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