How to Manage Pests

UC Pest Management Guidelines

Strawberry

General Properties of Fungicides Used in Strawberries

(Reviewed 6/08, updated 5/10)

In this Guideline:


Common name (trade name) Chemical class Group (FRAC) number1 Activity Mode of action Resistance potential Comments
azoxystrobin (Quadris) Qol4 11 systemic2 single-site high  
captan phthalamide M4 contact multi-site very low toxic to honey bee larvae; do not apply during bloom
cyprodinil (Vangard) anilinopyrimidine 9 mostly contact, slightly systemic single-site high  
cyprodinil/fludioxonil (Switch) phenylpyrrole/
anilinopyrimidine
12/9 contact/systemic single-site medium  
fenhexamid (Elevate) hydroxyanilide 17 contact single-site high  
fludioxonil (Scholar) phenylpyrrole 12 contact few to multi-site low  
fosetyl-al (Aliette) phosphonate 33 systemic multi-site low  
iprodione (Rovral) dicarboximide 2 systemic multi-site low toxic to honey bee larvae; do not apply during bloom
mefenoxam (Ridomil Gold) phenylamide 4 systemic single-site high  
myclobutanil (Rally) DMI3-triazole 3 systemic2 single-site high  
pyraclostrobin (Cabrio) Qol4 11 systemic2 single-site high  
pyraclostrobin/boscalid (Pristine) Qol4/carboxamide 11/7 systemic2 single-site high  
quinoxyfen (Quintec) quinoline 13 contact single-site medium  
thiophanate-methyl (Topsin) benzimidazole 1 systemic single-site very high  
thiram dithiocarbamates M3 contact multi-site low  
triflumizole (Procure) DMI3-imidazole 3 systemic2 single-site high  
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 Generally considered to have systemic action based on performance data but has not been proven experimentally.
3 DMI = demethylation (sterol) inhibitor
4 Qol = quinone outside inhibitor (strobilurin)

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Strawberry
UC ANR Publication 3468

General Information

Acknowledgment: Adaskaveg et al. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops. For the most current information see the 2012 edition (PDF).

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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