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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Strawberry

2008 Fungicide Efficacy and Treatment Timing

(Reviewed 2/08, updated 2/08)

In this Guideline:

FUNGICIDE EFFICACY FOR STRAWBERRY DISEASES

Note: Disease control in spring and preharvest is not necessary for most plum cultivars in California.
Fungicide Resistance risk (FRAC#)1 Powdery mildew Gray Mold Anthracnose Angular Leaf Spot Common Leaf Spot Mucor Rot Rhizopus Rot Leather Rot Crown Rot Red Steele
Rally high (3) ++++ ++ ++ — +++ — — — — —
Procure high (3) ++++ — + — — — — — — —
Topsin-M very high (1)2 +++ +++ — — ++ — — — — —
Eminent* high (3) NR NR ND — ND ND ND — — —
Copper low (M1) — — — ++ — — — — — —
Sulfur low (M2) +++ — — — — — — — — —
Quadris medium (11)2 +++ ++ ++ — — ND ND ND ND ND
Pristine medium (7/11)2 +++ ++++ ND — — ND ND ND ND ND
Cinnacure low + — — — — — — — — —
Elevate high (17)2 +/- ++++ +++ — — — — — — —
M-Pede low + — — — — — — — — —
Rovral low (2) — +++ — — — ++ — — — —
Switch high (7/12) — ++++ +++ — — + +++ — — —
Captan very low (M4) — +++ +++ — — + — — — —
Thiram low (M3) — ++ ++ — — — — — — —
Aliette3 low (33) — — — — — — — +++ ++ ++
Ridomil Gold SL 4 high (4)2 — — — — — — — +++4 ++ ++
Rating: ++++ = excellent and consistent, +++ = good and reliable, ++ = moderate and variable, + = limited and/or erratic, +/- = minimal and often ineffective, — = ineffective, NR = not registered, and ND = no data.
* 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. 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.
3. Foliar applications provide systemic treatment.
4. Ridomil Gold SL is the only formulation registered. If the GR formulation is applied to a previous crop that must be removed, it
has a 0-day plantback interval.

FUNGICIDE TREATMENT TIMING IN STRAWBERRY

Note: Not all indicated timings may be necessary for disease control.
Disease Pre-plant fumigation2 Clean nursery stock At Planting Preharvest1
Dips or water washing Before overhead irrigations Foliar Fruit
Anthracnose3 +++ +++ +++ + + +++
Botrytis fruit rot3 — — — + ++ +++
Mucor fruit rot — — — + + +++
Rhizopus rot — — — — — +++
Angular leaf spot + +++ + +++ + —
Common leaf spot3 + +++ ++ +++ +++ +
Powdery mildew3 — +++ — — +++ +
Leather rot4 +++ — — ++ — ++
Phytophthora crown rot4 +++ + — ++ + —
Red steele4 ++ ++ — + ++ —
Verticillium wilt +++ ++ — — — —
Rating: +++ = most effective, ++ = moderately effective, + = least effective, and — = ineffective.
1. Preharvest treatments include applications of fungicides before heavy fog, dews, or rain.
2. Preplant fumigation includes methyl bromide/chloropicrin, 1,3-dichloropropene/chloropicrin or chloropicrin followed by metam sodium or metam potassium or solitary applications of 1,3-dichloropropene/chloropicrin or chloropicrin.
3.

Integrated programs required for management including rotation of fungicides of different classes.

4. In-season, foliar treatments include phosphite or fosetyl-aluminum products or soil applications.

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: Strawberry
UC ANR Publication 3468
General Information

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Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2008 The Regents of the University of California. All rights reserved.

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