How to Manage Pests

UC Pest Management Guidelines

Cherry

Fungicide Resistance Management

(Reviewed 11/09, updated 1/16)

In this Guideline:


Note: Not all indicated timings may be necessary for disease control (see Treatment Timing Table. If treatments are needed based on weather monitoring or environmental monitoring models, suggested fungicide groups are listed for each timing.

HOW TO USE THIS TABLE

  1. Identify the disease(s) that need(s) to be managed. Know the disease history of the orchard especially from the previous season.
  2. Select one of the suggested fungicide groups. Numbers separated by slashes are pre-mixtures, whereas numbers grouped by pluses are tank mixtures.If several diseases need to be managed, select a group that is effective against all diseases. Refer to fungicide efficacy table for fungicides belonging to each FRAC group. Group numbers are listed in numerical order within the suggested disease management program.
  3. Rotate groups for each application within a season and, if possible, use each group only once per season, except for multi-site mode of action materials or natural products/biological controls (i.e., M2, NP/BC).
FRAC1 Group Numbers Suggested for Disease Management Program
Disease Dormant Prebloom White Tip/Popcorn Full bloom Petal fall 2-3 weeks later Preharvest 1-10 days
Botrytis blossom blight/Gray mold fruit decay ---- ---- 13
2 (+oil)
(3)4
13
2 (+oil)
(3)4
3/7, 3/11
3+17
7/11
17, 19
2 (+oil)
7, 7/11
17, 19
---- (3)4
3+17
7/11
17, 19
Brown rot blossom blight/Fruit rot ---- ---- 13
2 (+oil)
3, 7
3/11, 19
13
3, 7, 3/7
3+17
3/11
7/11
17, 19
---- ---- 3, 7
3/11
7/11
17, 19
Powdery mildew M22 M22 2 (+oil), 3 13
3, 7, 3/7
3/11
7/11
13, 19
7, 7,11, 13, 19
M22
NP/BC5
3, 7, 3/11
11, 7/11
13, 19
M22
NP/BC5
3
3/11
3+17
7/11
11, 19
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/). Group numbers are listed in numerical order within the suggested disease management program. Fungicides with a different group number are suitable to alternate in a resistance management program. Refer to the fungicide efficacy table for fungicides belonging to each FRAC group.
2Use liquid lime sulfur in dormant applications and wettable sulfur at and after prebloom.
3 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.
4 Among the group 3 fungicides, Elite/Tebuzol/Orius and Quash have some activity against Botrytis cinerea.
5 NP/BC = Natural Products/Biological Controls such as copper, sulfur, potassium bicarbonate (Kaligreen), Streptomyces lydicus (Actinovate AG), Bacillus pumilus (Sonata), and Bacillus subtilis (Serenade).

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Cherry
UC ANR Publication 3440

General Information

Acknowledgment: Acknowledgment: Adaskaveg et al., 2015. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (PDF).

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