Beta-cyfluthrin (Ref: OMS 3051)

Beta-cyfluthrin (Ref: OMS 3051)	Last updated: 20/02/2025
(Also known as: FCR 4545)

SUMMARY

Beta-cyfluthrin is a pyrethroid insecticide. It has a low aqueous solubility, semi-volatile and is not expected to leach to groundwater. It is highly toxic to mammals and may be a neurotoxin. It is also highly toxic to fish, aquatic invertebrates, aquatic plants and honeybees but slightly less toxic to birds, algae and earthworms.

Data alerts

The following alerts are based on the data in the tables below. An absence of an alert does not imply the substance has no implications for human health, biodiversity or the environment but just that we do not have the data to form a judgement.

Environmental fate	Ecotoxicity	Human health
Environmental fate High alert: Potential for particle bound transport: High	Ecotoxicity High alert: Birds chronic ecotoxicity: High; Fish acute ecotoxicity: High; Fish chronic ecotoxicity: High; Daphnia acute ecotoxicity: High; Daphnia chronic ecotoxicity: High; Bees acute contact ecotoxicity: High; Bees acute oral ecotoxicity: High; Earthworms acute ecotoxicity: High	Human health High alert: Mammals acute toxicity: High; Reproduction/development effects; Neurotoxicant

GENERAL INFORMATION

Description

A pyrethroid insecticide effective against a range of common pests including locusts in a many different crops

Example pests controlled

Migratory locusts; Grasshoppers; Mosquitoes; Bedbugs; Loopers; Cutworms; Spittlebugs; Leaf hoppers; Caterpillars; Armyworms; Weevils; Stinkbugs

Example applications

Alfalfa; Corn; Cotton; Peanuts; Sorghum; Sugarcane; Sugarbeet; Tobacco; Wheat; Brassicas; Sweetcorn; Potatoes; Tomatoes; Stone fruit; Root vegetables

Efficacy & activity

Field trials have adequately demonstrated efficiacy.

Availability status

Current

Introduction & key dates

1993, first reported; 2021, withdrawn UK

GB regulatory status

GB COPR regulatory status

Phasing out

Date COPR inclusion expires

Expired

GB LERAP status

Check label - may vary with formulation

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Not approved

Dossier rapporteur/co-rapporteur

Germany/Hungary

Date EC 1107/2009 inclusion expires

Expired

EU Candidate for substitution (CfS)

Listed in EU database

Yes

Approved for use (✓) under EC 1107/2009 in the following EU Member States

ATAustria	BEBelgium	BGBulgaria	CYCyprus	CZCzech Republic	DEGermany	DKDenmark	EEEstonia	ELGreece
✓	✓	✓	✓	✓	✓	✓	✓	✓
ESSpain	FIFinland	FRFrance	HRCroatia	HUHungary	IEIreland	ITItaly	LTLithuania	LULuxembourg
✓	✓	✓		✓		✓	✓
LVLatvia	MTMalta	NLNetherlands	PLPoland	PTPortugal	RORomania	SESweden	SISlovenia	SKSlovakia
✓		✓	✓	✓	✓	✓	✓	✓

Approved for use (✓) under EC 1107/2009 by Mutual Recognition of Authorisation and/or national regulations in the following EEA countries

ISIceland	NONorway

Additional information

Also used in

Australia; USA

Chemical structure

Isomerism

An isomeric mixture of the two biologically active diastereoisomeric pairs of cyfluthrin. Diastereomer II 300-400 g/kg; Diastereomer IV 570-670 g/kg.

Chemical formula

C₂₂H₁₈Cl₂FNO₃

Canonical SMILES

CC1(C(C1C(=O)OC(C#N)C2=CC(=C(C=C2)F)OC3=CC=CC=C3)C=C(Cl)Cl)C

Isomeric SMILES

CC1([C@H](C1C=C(Cl)Cl)C(=O)O[C@@H](C#N)C2=CC(=C(C=C2)F)OC3=CC=CC=C3)C

International Chemical Identifier key (InChIKey)

OFHFONYRMVKULH-WNYJFNBPSA-N

International Chemical Identifier (InChI)

InChI=1S/C22H18Cl2FNO3/c1-22(2)15(11-19(23)24)20(22)21(27)29-18(12-26)13-8-9-16(25)17(10-13)28-14-6-4-3-5-7-14/h3-11,15,18,20H,1-2H3

2D structure diagram/image available?

Yes

Cambridge Crystallographic Data Centre diagrams

Common Name	Relationship	Link
beta-cyfluthrin	-

General status

Pesticide type

Insecticide

Substance groups

Pyrethroid ester insecticide

Minimum active substance purity

>=965 g kg⁻¹

Known relevant impurities

EU dossier - None declared

Substance origin

Synthetic

Mode of action

Non-systemic with contact and stomach action. Sodium channel modulator.

CAS RN

1820573-27-0

EC number

269-855-7

CIPAC number

482

US EPA chemical code

118831

PubChem CID

56608859

CLP index number

607-254-00-7

Molecular mass

434.29

PIN (Preferred Identification Name)

reaction mixture comprising the enantiomeric pair rac-(R)-cyano(4-fluoro-3-phenoxyphenyl)methyl (1S,3S)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate in ratio 1:2 with the enantiomeric pair rac-(R)-cyano(4-fluoro-3-phenoxyphenyl)methyl (1S,3R)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate

IUPAC name

(R)-α-cyano-4-fluoro-3-phenoxybenzyl (1S,3S)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (S)-α-cyano-4-fluoro-3-phenoxybenzyl (1R,3R)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarbox

CAS name

cyano(4-fluoro-3-phenoxyphenyl)methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate

Other status information

Relevant Environmental Water Quality Standards

UK Environment Agency non-statutory standard for the protection of freshwater and saltwater aquatic life 0.001 µg l⁻¹

Herbicide Resistance Class (HRAC MoA class)

Not applicable

Herbicide Resistance Class (WSSA MoA class)

Not applicable

Insecticide Resistance Class (IRAC MoA class)

Fungicide Resistance Class (FRAC MOA class)

Not applicable

Examples of recorded resistance

Helicoverpa armigera, Musca domestica, Triatoma infestans

Physical state

White crystalline powder

Related substances & organisms

cyfluthrin

Formulations

Property

Value

Example manufacturers & suppliers of products using this active now or historically

Bayer CropScience
Bayer Environmental Science
AgroCare

Example products using this active

Chinook Blue
Modesto
Hawk
Acilothrin B
Bulldog 25EC
Baythroid

Formulation and application details

Available in a wide variety of formulations including emulsifiable concentrates, granules, oil in water emulsions, suspension concentrates, ULVs and wettable powders.

ENVIRONMENTAL FATE

Property

Value

Source; quality score; and other information

Interpretation

Solubility - In water at 20 °C (mg l⁻¹)

0.0019

(isomer mean)

Low

Solubility - In organic solvents at 20 °C (mg l⁻¹)

150000

Toluene

10000

n-Hexane

200000

Dichloromethane

Melting point (°C)

(82-96 °C)

Boiling point (°C)

Decomposes before boiling

Degradation point (°C)

210

Flashpoint (°C)

Octanol-water partition coefficient at pH 7, 20 °C

7.08 X 10⁰⁵

Calculated

Log P

5.85

(isomer mean)

High

Fat solubility of residues

Solubility

Soluble

Data type

Regulatory data - observed in metabolism and farm animal feeding studies

Density (g ml⁻¹)

1.35

Dissociation constant pKa) at 25 °C

Not applicable

No dissociation

Vapour pressure at 20 °C (mPa)

2.8 X 10^-03

(isomer mean)

Low volatility

Henry's law constant at 25 °C (Pa m³ mol⁻¹)

0.347

(isomer mean)

Moderately volatile

Volatilisation as max % of applied dose lost

From plant surface

24 hr

Volatilisation is not considered critical for air pollution

From soil surface

24 hr

Volatilisation is not considered critical for air pollution

Maximum UV-vis absorption L mol⁻¹ cm⁻¹

ISOMER II Neutral pH; 204nm=41366, 269nm=2129, 276nm=2008, 291nm=80
Acidic pH: 203nm=44498, 269nm=2129, 276nm=2008, 291nm=80
Basic pH: 220nm=29639, 295nm=1486 ISOMER IV Neutral pH 204nm=42545, 269nm=2127, 276nm=2000, 291nm=85
Acidic pH: 204nm=42503, 269nm=2042, 276nm=1957, 291nm=43
Basic pH: 219nm=28888, 294nm=1617

Surface tension (mN m⁻¹)

Degradation

Property

Value

Source; quality score; and other information

Interpretation

General biodegradability

Not readily biodegradable

Soil degradation (days) (aerobic)

DT₅₀ (typical)

28.0

Non-persistent

DT₅₀ (lab at 20 °C)

28.0

Non-persistent

DT₅₀ (field)

93.3

Moderately persistent

DT₉₀ (lab at 20 °C)

677

Very persistent

DT₉₀ (field)

192

DT₅₀ modelling endpoint

Note

EU 2018 Dossier lab studies DT₅₀ (normalised) range 16.7-89.5 days, DT₉₀ (measured) range 66-194 days, Soils =4, Field studies DT₅₀ (measured) range 3.3-297 days, DT₉₀ (measured) range 52-359 days, Soils=4; EU 2002 Dossier Lab studies DT₅₀ range 4-54 days, DT₉₀ range 53-1664 days, field study DT₅₀ range 5-21 days (Germany), DT₉₀ range 70-133 days

Dissipation rate RL₅₀ (days) on plant matrix

Value

1.4

Note

Published literature RL₅₀ range 0.8-1.7 days,2 field crops, various matrices, n=3

Dissipation rate RL₅₀ (days) on and in plant matrix

Value

2.52

Note

Published literature RL₅₀ range 1.2-4.7 days, 4 field crops, various matrices, n=4

Aqueous photolysis DT₅₀ (days) at pH 7

Value

5.5

Moderately fast

Note

Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7

Value

160

Persistent

Note

pH sensitive: DT₅₀: >1 year at pH 4, 33 hours at pH 9

Water-sediment DT₅₀ (days)

27.6

Fast

Water phase only DT₅₀ (days)

0.5

Fast

Sediment phase only DT₅₀ (days)

Air degradation

As this parameter is not normally measured directly, a surrogate measure is used: ‘Photochemical oxidative DT₅₀’. Where data is available, this can be found in the Fate Indices section below.

Decay in stored produce DT₅₀

Soil adsorption and mobility

Property

Value

Source; quality score; and other information

Interpretation

Linear

K_d (mL g⁻¹)

1216

Non-mobile

K_oc (mL g⁻¹)

104491

Notes and range

EU 2018 dossier K_d range 810-1793 mL g⁻¹, K_oc range 64286-180290 mL g⁻¹, Soils=5

Freundlich

K_f (mL g⁻¹)

K_foc (mL g⁻¹)

¹/_n

Notes and range

pH sensitivity

Fate indices

Property

Value

Source; quality score; and other information

Interpretation

GUS leaching potential index

-2.01

Calculated

Low leachability

SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate

Value

5.35 X 10^-03

Calculated

Note

Estimated concentrations of chemicals with Koc values greater than 9995 ml g⁻¹ are beyond the scope of the regression data used in SCI-GROW development. If there are concerns for such chemicals, a higher tier groundwater exposure assessment should be considered, regardless of the concentration returned by SCI-GROW

Potential for particle bound transport index

High

Calculated

Potential for loss via drain flow

Non-mobile

Calculated

Photochemical oxidative DT₅₀ (hrs) as indicator of long-range air transport risk

17.8

Calculated using the Atkinson method. Assumed 5.0E+05 OH/cm³, 24 hr

Below the level of concern for long-range air transport

Bio-concentration factor

BCF (l kg⁻¹)

506

Threshold for concern

CT₅₀ (days)

Known soil metabolites

Metabolite

Major/Minor fraction

$Click here for further information on Major/Minor fraction$

Estimated maximum occurrence fraction

Notes

3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid

Major fraction

0.405

4-fluoro-3-phenoxybenzoic acid

Major fraction

0.127

Known groundwater metabolites

None

Other known metabolites

Metabolite name and reference

Aliases

Formation medium / Rate

Estimated maximum occurrence fraction

(1RS)-1-(4-fluoro-3-phenoxyphenyl)-2-methoxy-2-oxoethyl (1RS,3RS:RS,3SR)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate

methyl cyfluthrin

4-fluoro-3-phenoxybenzamide

FBP amide

Plant

methyl 4-fluoro-3-phenoxybenzoate

Me-FPB acid

Plant

4-fluoro-3-phenoxybenzaldehyde

FPB-aldehyde

Rat; Plant; Surface water; Sediment

(4-fluoro-3-phenoxyphenyl)methanol

FPB-alcohol

Plant

1-fluoro-2-phenoxybenzene

FPB

Plant

4-fluoro-3-(3-hydroxyphenoxy)benzoic acid

4-OH-FPB acid

Rat; Plant

(1RS,3RS;1RS,3SR)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylic acid

DCVA

Rat; Surface water; Sediment

4-fluoro-3-phenoxybenzoic acid

FPB-acid

Rat; Surface water; Sediment

3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid (Ref: FCR 2728)

cyfluthrin acid

Plant

ECOTOXICOLOGY

Terrestrial ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 14.3

Rat as cyfluthrin

High

Mammals - Short term dietary NOEL

(mg kg⁻¹)

1.5

Rat

High

(ppm diet)

100

Mammals - Chronic 21d NOAEL (mg kg⁻¹ bw d⁻¹)

26.7

Unknown species Reproductive NOAEL

Moderate

Birds - Acute LD₅₀ (mg kg⁻¹)

> 170

Serinus canaria

Moderate

Birds - Short term dietary (LC₅₀/LD₅₀)

> 5000 ppm

Colinus virginianus as cyfluthrin

Birds - Chronic 21d NOEL (mg kg⁻¹ bw d⁻¹)

2.6

Anas platyrhynchos NOAEL

High

Earthworms - Acute 14 day LC₅₀ (mg kg⁻¹)

0.565

Eisenia foetida as EC10 corr

High

Earthworms - Chronic NOEC, reproduction (mg kg⁻¹)

> 0.825

Eisenia foetida corr

Moderate

Soil micro-organisms

Nitrogen mineralisation: No significant adverse effect
Carbon mineralisation: No significant adverse effect

Dose: 0.18 g as/ha

Collembola

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

Folsomia candida corr

Non-target plants

> 60

Cabbage Cucumber Sunflower Barley Rye
Vegatitive vigour, ER₅₀
as g ha⁻¹

> 60

Cabbage Cucumber Sunflower Barley Rye
Seedling emergence, ER₅₀
as g ha⁻¹

Honeybees (Apis spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

0.012

Apis mellifera

High

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

0.05

Apis mellifera

High

Unknown mode acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Chronic as 10-day LDD₅₀ µg bee⁻¹ day⁻¹

0.019

Apis mellifera

Notes

Bumblebees (Bombus spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

0.46

Bombus terrestris

High

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

0.12

Bombus terrestris

High

Mason bees (Osmia spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

0.035

Osmia bicornis

High

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Other bee species (1)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Other bee species (2)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Beneficial insects (Ladybirds) as Mortality ER₅₀ g ha⁻¹

< 0.3

Coccinella septempunctata Larva

Beneficial insects (Lacewings)

Beneficial insects (Parasitic wasps) as Mortality LR₅₀ g ha⁻¹

0.163

Aphidius rhopalosiphi

Beneficial insects (Predatory mites) as Mortality LR₅₀ g ha⁻¹

0.0025

Typhlodromus pyri

Beneficial insects (Ground beetles) as Mortality LR₅₀ g ha⁻¹

> 7.7

Poecilus cupreus

Aquatic ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Temperate Freshwater Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

0.000068

Oncorhynchus mykiss

High

Temperate Freshwater Fish - Chronic 21 day NOEC (mg l⁻¹)

0.000032

Oncorhynchus mykiss 72 day

High

Tropical Freshwater Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

Temperate Freshwater Aquatic invertebrates - Acute 48 hour EC₅₀ (mg l⁻¹)

0.00029

Daphnia magna

High

Temperate Freshwater Aquatic invertebrates - Chronic 21 day NOEC (mg l⁻¹)

0.00014

Daphnia magna

High

Tropical Freshwater Aquatic invertebrates - Acute 48 hour EC₅₀ (mg l⁻¹)

Aquatic crustaceans - Acute 96 hour LC₅₀ (mg l⁻¹)

0.0000022

Americamysis bahia

High

Sediment dwelling organisms - Acute 96 hour LC₅₀ (mg l⁻¹)

0.00045

Chironomus riparius

High

Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l⁻¹)

Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg⁻¹)

0.00004

Chironomus riparius

High

Aquatic plants (free-floating, growth) - Acute 7 day EC₅₀, biomass (mg l⁻¹)

> 0.00084

Lemna gibba

High

Aquatic plants (rooted, growth) - Acute 14 day EC₅₀, biomass (mg l⁻¹)

Algae - Acute 72 hour EC₅₀, growth (mg l⁻¹)

> 0.002

Scenedesmus subspicatus

High

Algae - Chronic 96 hour NOEC, growth (mg l⁻¹)

0.01

Unknown species

Moderate

Mesocosm study data

NOEAEC mg l⁻¹

0.00005

Aquatic community

NOEAEC mg l⁻¹

0.00001

NOEC Aquatic community

Marine bivalves

HUMAN HEALTH AND PROTECTION

General

Property

Value

Source; quality score; and other information

Interpretation

Threshold of Toxicological Concern (Cramer Class)

High (class III)

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 14.3

Rat as cyfluthrin

High

Mammals - Dermal LD₅₀ (mg kg⁻¹ body weight)

2000

Rat

Mammals - Inhalation LC₅₀ (mg l⁻¹)

0.081

Rat (aerosol)

Other Mammal toxicity endpoints

ADI - Acceptable Daily Intake (mg kg⁻¹ bw day⁻¹)

0.01

ARfD - Acute Reference Dose (mg kg⁻¹ bw day⁻¹)

0.01

AAOEL - Acute Acceptable Operator Exposure Level (mg kg⁻¹ bw day⁻¹)

0.01

Rat 4wk SF=100

AOEL - Acceptable Operator Exposure Level - Systemic (mg kg⁻¹ bw day⁻¹)

0.0002

Dermal penetration studies (%)

0.1-13.0

concentration dependent

Dangerous Substances Directive 76/464

Exposure Routes

Public

Occupational

MRLs

European

EU MRL pesticide database

Great Britain

GB MRL Register

Notes

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

Mammalian dose elimination route and rate

Rapid and extensive excretion mainly via urine within 48hrs.

Health issues

Specific human health issues

Carcinogen

Genotoxic

Endocrine disruptor

; ; ; ;

Reproduction / development effects

Acetyl cholinesterase inhibitor

Neurotoxicant

Respiratory tract irritant

Skin irritant

Skin sensitiser

Eye irritant

Phototoxicant

General human health issues

May cause metabolic or neurological disturbances

Handling issues

Property

Value and interpretation

General

Not explosive or oxidising
IMDG Transport Hazard Class 6.1
Not expected to auto-ignite; Not highly flammable

CLP classification 2013

Health: H300, H330, H361d, H362, H335
Environment: H400, H410

WHO Classification

Ib (Highly hazardous)

UN Number

UN2811

Waste disposal & packaging

Packaging Group II (moderate danger)

Shelf-life, storage, stability and reactivity

TRANSLATIONS

Language

Name

English

beta-cyfluthrin

French

betacyflutrine

German

beta-Cyfluthrin

Danish

betacyfluthrin

Italian

beta-ciflutrina

Spanish

beta-ciflutrina

Greek

beta-cyfluthrin

Polish

beta-cyflutryna

Swedish

betacyflutrin

Hungarian

beta-ciflutrin

Dutch

Norwegian

Record last updated:	20/02/2025
Contact:	aeru@herts.ac.uk
Please cite as:	Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242