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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Strawberry

2009 Fungicide Efficacy and Treatment Timing

(Reviewed 3/09, updated 3/09)

In this Guideline:

FUNGICIDE EFFICACY FOR STRAWBERRY DISEASES

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/T-Methyl/
Thiophanate-Methyl		 very high (1)2 +++ +++ ---- ---- ++ ---- ---- ---- ---- ----
Eminent* high (3) NR NR ND ---- ND ND ND ---- ---- ----
Copper low (M1) ---- ---- ---- +++5 ---- ---- ---- ---- ---- ----
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/Iprodione/Nevado low (2) ---- +++ ---- ---- ---- ++ ---- ---- ---- ----
Switch high  (7/12) ---- ++++ +++ ---- ---- + +++ ---- ---- ----
Captan very low (M4) ---- +++ +++ ---- ---- + ---- ---- ---- ----
Thiram low (M3) ---- ++ ++ ---- ---- ---- ---- ---- ---- ----
Aliette/Legion3 low (33) ---- ---- ---- ---- ---- ---- ---- +++ ++ ++
Ridomil Gold SL4 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.
5 Greater than 4 applications causes severe stunting.

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.

Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2009. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (960 KB, PDF)

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Strawberry
UC ANR Publication 3468
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Statewide IPM Program, Agriculture and Natural Resources, University of California
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