Cyfluthrin (Ref: OMS 2012)

Cyfluthrin (Ref: OMS 2012)	Last updated: 20/02/2025
(Also known as: cyfluthrine; cyfoxylate; BAY FCR 1272)

SUMMARY

Cyfluthrin is a pyrethroid insecticide. It has a low aqueous solubility and is non-volatile. It may be moderately persistent in some soil systems. Cyfluthrin is highly toxic to most biodiversity. It also has a high oral mammalian toxicity and may be a neurotoxin.

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 Moderate alert: Moderately persistent; Potential for particle bound transport: Medium	Ecotoxicity High alert: 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	Human health High alert: Mammals acute toxicity: High; Neurotoxicant

GENERAL INFORMATION

Description

An insecticide effective against a range of chewing & sucking pests including Lepidoptera, Coleoptera and Hemiptera

Example pests controlled

Corn rootworm; Cutworms; Wireworms; Maggots; Seedcorn beetles; White grubs; Thrips; Cockroaches; Mosquitoes; Silverfish; Corn borer

Example applications

Field corn; Sweetcorn; Popcorn; Silage corn; Citrus; Public health situations

Efficacy & activity

Availability status

Current

Introduction & key dates

1983, introduced; 2008, withdrawn UK

GB regulatory status

GB COPR regulatory status

Not approved

Date COPR inclusion expires

Expired

GB LERAP status

No UK approval for use as a plant protection agent

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Not approved

Dossier rapporteur/co-rapporteur

Germany

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

Chiral, existing as four diastereoisomer pairs (8 enantiomers)

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

International Chemical Identifier key (InChIKey)

QQODLKZGRKWIFG-UHFFFAOYSA-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

General status

Pesticide type

Insecticide

Substance groups

Pyrethroid inseticide; Pyrethroid ester insecticide

Minimum active substance purity

920 +/- 25 g kg⁻¹

Known relevant impurities

EU dossier - Only 1% water declared

Substance origin

Synthetic

Mode of action

Non-systemic with contact and stomach action and rapid knock-down effect. Sodium channel modulator.

CAS RN

68359-37-5

EC number

269-855-7

CIPAC number

385

US EPA chemical code

128831

PubChem CID

104926

CLP index number

607-253-00-1

Molecular mass

434.29

PIN (Preferred Identification Name)

(E)-cyano(4-fluoro-3-phenoxyphenyl)methyl (1E,3E)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate

IUPAC name

(RS)-α-cyano-4-fluoro-3-phenoxybenzyl (1RS,3RS;1RS,3SR)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate

CAS name

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

Other status information

Chemical subject to PIC regulations

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

Aedes aegypti, Aphis gossypii, Musca domestica, Spodoptera litura, Heliothis virescens, many others

Physical state

Amber coloured viscous part crystalline / part oil paste like substance

Formulations

Property

Value

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

Makhteshim
Bayer CropScience
Scotts Company
BOC Sciences

Example products using this active

Baythroid
Solfac
Tempo
Aztec

Formulation and application details

Often supplied as an emulsifiable concentrate which is mixed with water and applied as a spray

ENVIRONMENTAL FATE

Property

Value

Source; quality score; and other information

Interpretation

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

0.0066

Low

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

200000

Toluene

10000

n-Hexane

200000

Dichloromethane

Melting point (°C)

Boiling point (°C)

Decomposes before boiling

Degradation point (°C)

210

Flashpoint (°C)

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

1.00 X 10⁰⁶

Calculated

Log P

High

Fat solubility of residues

Solubility

Soluble

Data type

Regulatory data - observed in metabolism and farm animal feeding studies

Density (g ml⁻¹)

1.28

Dissociation constant pKa) at 25 °C

Not applicable

No dissociation

Vapour pressure at 20 °C (mPa)

0.0003

Low volatility

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

5.30 X 10^-02

Non-volatile

Volatilisation as max % of applied dose lost

From plant surface

From soil surface

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

No absorption above 290nm

Surface tension (mN m⁻¹)

Degradation

Property

Value

Source; quality score; and other information

Interpretation

General biodegradability

Soil degradation (days) (aerobic)

DT₅₀ (typical)

Moderately persistent

DT₅₀ (lab at 20 °C)

Moderately persistent

DT₅₀ (field)

Moderately persistent

DT₉₀ (lab at 20 °C)

680

Very persistent

DT₉₀ (field)

133

DT₅₀ modelling endpoint

Note

EU dossier Lab studies DT₅₀ range 48-54 days, DT₉₀ range 53-1664 days, field study DT₅₀ range 26-40 days (Germany)

Dissipation rate RL₅₀ (days) on plant matrix

Value

6.7

Note

Published literature RL₅₀ range 1.7-21.5 days, 4 field crops, various matrices, n=5

Dissipation rate RL₅₀ (days) on and in plant matrix

Value

2.2

Note

Published literature RL₅₀ range 0.8-5.9 days, 10 field & undercover grown crops, various matrices, n=15

Aqueous photolysis DT₅₀ (days) at pH 7

Value

Moderately fast

Note

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

Value

215

Persistent

Note

Stable pH 4 to pH 7, DT₅₀ 1.6 days at pH 9, 20 °C

Water-sediment DT₅₀ (days)

Fast

Water phase only DT₅₀ (days)

Moderately 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

[Wheat grain: 70 wks @ 30 DegC, 50% RH; Modelled data]

Soil adsorption and mobility

Property

Value

Source; quality score; and other information

Interpretation

Linear

K_d (mL g⁻¹)

1369

Non-mobile

K_oc (mL g⁻¹)

123930

Notes and range

EU dossier K_d range 1116-1793 mL g⁻¹, K_oc range 73484-180290 mL g⁻¹, Soils=4

Freundlich

K_f (mL g⁻¹)

1.02

K_foc (mL g⁻¹)

¹/_n

1.1

Notes and range

Soil with 68% loam, 24% silt, 8% clay, pH 6.5, OC=2.1%

pH sensitivity

Adsorption decreases with increasing pH and increasing organic carbon

Fate indices

Property

Value

Source; quality score; and other information

Interpretation

GUS leaching potential index

-1.66

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

Medium

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

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

4-fluoro-3-phenoxybenzoic acid

Major fraction

0.100

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

Major fraction

0.100

2-amino-1-(4-fluoro-3-phenoxyphenyl)-2 oxoethyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate

Minor fraction

4-fluro-3-phenoxybenamide

Minor fraction

Known groundwater metabolites

None

Other known metabolites

None

ECOTOXICOLOGY

Terrestrial ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 16.2

Rat

High

Mammals - Short term dietary NOEL

(mg kg⁻¹)

Rat

High

(ppm diet)

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

Birds - Acute LD₅₀ (mg kg⁻¹)

> 2000

Colinus virginianus

Low

Birds - Short term dietary (LC₅₀/LD₅₀)

> 5000 mg kg feed⁻¹

Colinus virginianus

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

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

> 1000

Eisenia foetida

Low

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

Soil micro-organisms

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

Dose: 0.75 kg as/ha

Collembola

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

Non-target plants

Honeybees (Apis spp.)

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

0.001

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

Notes

[The residual time to 25% mortality (RT25) value for honeybees is 240 hrs - USEPA data]

Bumblebees (Bombus spp.)

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

> 0.36

Bombus terrestris

High

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

> 0.11

Bombus terrestris

High

Mason bees (Osmia spp.)

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

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)

0.008

Megachile rotundata

High

Mode of exposure

Contact

Other bee species (2)

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

0.003

Nomia melanderi

High

Mode of exposure

Contact

Beneficial insects (Ladybirds) as Mortality LR₅₀ g ha⁻¹

0.017

Coccinella septempunctata Larva

Beneficial insects (Lacewings)

Beneficial insects (Parasitic wasps) as Mortality LR₅₀ g ha⁻¹ 48 hr

1.63

Aphidius rhopalosiphi Protonymph

Beneficial insects (Predatory mites) as Mortality LR₅₀ g ha⁻¹ 7 day

0.42

Typhlodromus pyri Protonymph

Beneficial insects (Ground beetles)

Aquatic ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

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

0.00047

Oncorhynchus mykiss

High

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

0.00001

Oncorhynchus mykiss

High

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

0.14

Danio rerio EC₅₀ Embryo

Moderate

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

0.00016

Daphnia magna

High

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

0.00002

Daphnia magna

High

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

> 0.00001

Ceriodaphnia dubia

High

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

0.000002

Americamysis bahia

High

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

0.00011

Chironomus riparius EC5

High

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

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

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

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

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

> 10

Scenedesmus subspicatus

Low

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

Mesocosm study data

NOEAEC mg l⁻¹

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)

> 16.2

Rat

High

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

5000

Rat

Mammals - Inhalation LC₅₀ (mg l⁻¹)

4.05

Rat

Other Mammal toxicity endpoints

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

0.003

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

0.02

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

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

0.02

Dermal penetration studies (%)

Dangerous Substances Directive 76/464

Exposure Routes

Public

Occupational

MRLs

European

EU MRL pesticide database

Great Britain

GB MRL Register

Notes

GB MRL expected to deviate from the EU MRL in mid-2023

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

Mammalian dose elimination route and rate

Around 60% eliminated in the urine, remiander in the faces

Health issues

Specific human health issues

Carcinogen

Genotoxic

Endocrine disruptor

; ; ; ;

No data found

Reproduction / development effects

Acetyl cholinesterase inhibitor

Neurotoxicant

Respiratory tract irritant

Skin irritant

Skin sensitiser

No data found

Eye irritant

Phototoxicant

No data found

General human health issues

Highly toxic
Possible liver or kidney toxicant

Handling issues

Property

Value and interpretation

General

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

CLP classification 2013

Health: H300, H331
Environment: H400, H410

WHO Classification

Ib (Highly hazardous)

UN Number

UN3349

Waste disposal & packaging

Packaging Group III (minor danger)

Shelf-life, storage, stability and reactivity

Limited shelf-life

TRANSLATIONS

Language

Name

English

cyfluthrin

French

cyfluthrine

German

Cyfluthrin

Danish

cyfluthrin

Italian

ciflutrin

Spanish

ciflutrin

Greek

cyfluthrin

Polish

cyflutryna

Swedish

cyflutrin

Hungarian

ciflutrin

Dutch

cyfluthrin

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