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How to Manage Pests

UC Pest Management Guidelines

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Strawberry

2010 Fungicide Efficacy and Treatment Timing

(Reviewed 3/10, updated 5/10)

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
Bumper/Tilt high (3) ++++ ---- ++ ---- +++ ---- ---- ---- ---- ----
Mettle* high (3) NR NR ND ---- ND ND ND ---- ---- ----
Procure high (3) ++++ ---- + ---- ---- ---- ---- ---- ---- ----
Quilt Xcel* medium (3/11) ++++ ++ +++ ---- ---- ND + ND ND ND
Rally high (3) ++++ ---- ++ ---- +++ ---- ---- ---- ---- ----
Topsin-M/T-Methyl/Thio-phanate-Methyl very high (1)2 +++ +++ ---- ---- ++ ---- ---- ---- ---- ----
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
Ph-D* medium (19) +++ ++ ++ ND ND ---- ---- ---- ---- ----
Cinnacure low + ---- ---- ---- ---- ---- ---- ---- ---- ----
Elevate high (17)2,6 +/- ++++6 +++ ---- ---- ---- ---- ---- ---- ----
M-Pede low + ---- ---- ---- ---- ---- ---- ---- ---- ----
Quintec high (13) ++++ ---- ---- ---- ---- ---- ---- ---- ---- ----
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 in California.
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.
6 Nonpersistent resistant populations of Botrytis cinerea to fenhexamid occur with repeated use of FRAC Group 17 fungicides.

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 Before overhead irrigations Foliar Fruit
Angular leaf spot + +++ + +++ + —
Anthracnose3 +++ +++ +++ + + +++
Botrytis fruit rot3 — — — + ++ +++
Common leaf spot3 + +++ ++ +++ +++ +
Leather rot4 +++ — — ++ — ++
Mucor rot — — — + + +++
Phytophthora crown rot4 +++ + — ++ + —
Powdery mildew3 — +++ — — +++ +
Red stele4 ++ ++ — + ++ —
Rhizopus rot — — — — — +++
Verticillium wilt +++ ++ — — — —
Rating: +++ = most effective; ++ = moderately effective; + = least effective; — = ineffective
1 Preharvest treatments include applicatons of fungicides before heavy fog, dews, or rain.
2 Preplant fumigation includes 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 Inseason foliar treatments include phosphite or fosetyl-aluminum products or soil applications.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

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