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How to Manage Pests

UC Pest Management Guidelines

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Cherry

Fungicide Resistance Management

(Reviewed 11/09, updated 5/10)

In this Guideline:

Note: Not all indicated timings may be necessary for disease control see MOST EFFECTIVE TREATMENT TIMINGS FOR KEY DISEASES. 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 FRAC1 mode of action group numbers. 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 General Properties of Fungicides table for fungicides belonging to each FRAC1 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 (e.g., M2).

FRAC1 Group Numbers Suggested for Disease Management Program
Disease Dormant Bloom  
  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
3/11
3+17
7/11
17 		2 (+oil)
7/11
17 		— (3)4
3+17
7/11
17
Brown rot blossom blight/Fruit rot — — 13
2 (+oil)
3
3/11 		13
3
3+17
3/11
7/11
17 		— —
3
3/11
7/11
17
Powdery mildew M22 M22 2(+oil), 3 13
3
7/11
13 		13
M22
NP/BC5 		3, 3/11
11
13
M22
NP/BC5 		3
3/11
3+17
7/11
11
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 a fungicide with a different mode of action Group number.
2 Use 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, only Elite has activity against Botrytis cinerea.
5 NP/BC = Natural Products/Biological Controls (e.g. cooper, sulfur, potassium bicarbonate – Kaligreen, etc.)

[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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