Oxathiapiprolin (Ref: DPX-QGU42)

Oxathiapiprolin (Ref: DPX-QGU42)	Last updated: 22/05/2025
(Also known as: QGU42)

SUMMARY

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 Moderate alert: Birds chronic ecotoxicity: Moderate; Fish acute ecotoxicity: Moderate; Fish chronic ecotoxicity: Moderate; Daphnia acute ecotoxicity: Moderate; Daphnia chronic ecotoxicity: Moderate; Bees acute oral ecotoxicity: Moderate	Human health Moderate alert: Reproduction/development effects

GENERAL INFORMATION

Description

A fungicide for use as a seed treatment against various fungal diseases on crops including potatoes and vegetables

Example pests controlled

Downy mildew; Late blight; Phytophthora root and stem blight

Example applications

Fruiting vegetables including tomatoes, aubergines, peppers, and curcubits; Lettuce; Grapes; Melons; Potatoes; Herbs

Efficacy & activity

Availability status

Current

Introduction & key dates

2013, introduced

GB regulatory status

GB COPR regulatory status

Approved

Date COPR inclusion expires

03/03/2032

GB LERAP status

None

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Approved

Dossier rapporteur/co-rapporteur

Ireland/Poland

Date EC 1107/2009 inclusion expires

03/03/2027

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

Morocco

Chemical structure

Isomerism

Substance is racemic.

Chemical formula

C₂₄H₂₂F₅N₅O₂S

Canonical SMILES

CC1=CC(=NN1CC(=O)N2CCC(CC2)C3=NC(=CS3)C4=NOC(C4)C5=C(C=CC=C5F)F)C(F)(F)F

Isomeric SMILES

International Chemical Identifier key (InChIKey)

IAQLCKZJGNTRDO-UHFFFAOYSA-N

International Chemical Identifier (InChI)

InChI=1S/C24H22F5N5O2S/c1-13-9-20(24(27,28)29)31-34(13)11-21(35)33-7-5-14(6-8-33)23-30-18(12-37-23)17-10-19(36-32-17)22-15(25)3-2-4-16(22)26/h2-4,9,12,14,19H,5-8,10-11H2,1H3

2D structure diagram/image available?

Yes

General status

Pesticide type

Fungicide

Substance groups

Oxazole fungicide; Pyrazole fungicide; Thiazole fungicide

Minimum active substance purity

950 g kg⁻¹

Known relevant impurities

EU dossier: none declared

Substance origin

Synthetic

Mode of action

Systemic, preventative with residual disease control. It acts via an oxysterol binding protein. Oxysterol-binding protein homologue inhibition (OSBPI).

CAS RN

1003318-67-9

EC number

801-263-1

CIPAC number

985

US EPA chemical code

PubChem CID

56945145

CLP index number

No data found

Molecular mass

539.53

PIN (Preferred Identification Name)

rac-1-(4-(4-((5R)-5-(2,6-difluorophenyl)-4,5-dihydro-1,2-oxazol-3-yl)-1,3-thiazol-2-yl)piperidin-1-yl)-2-[5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl]ethan-1-one

IUPAC name

1-(4-(4-((5RS)-5-(2,6-difluorophenyl)-4,5-dihydro-1,2-oxazol-3-yl)-1,3-thiazol-2-yl)-1-piperidyl)-2-(5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)ethanone

CAS name

1-(4-(4-(5-(2,6-difluorophenyl)-4,5-dihydro-3-isoxazolyl)-2-thiazolyl)-1-piperidinyl)-2-(5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)ethanone

Other status information

Relevant Environmental Water Quality Standards

Herbicide Resistance Class (HRAC MoA class)

Not applicable

Herbicide Resistance Class (WSSA MoA class)

Not applicable

Insecticide Resistance Class (IRAC MoA class)

Not applicable

Fungicide Resistance Class (FRAC MOA class)

Examples of recorded resistance

Physical state

Pure material: off-white crystalline solid (98.9 %)

Formulations

Property

Value

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

DuPont
Syngenta
Zorvec Endavia

Example products using this active

Orondis
Zorvec

Formulation and application details

ENVIRONMENTAL FATE

Property

Value

Source; quality score; and other information

Interpretation

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

0.1749

Low

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

n-Hexane

5800

o-Xylene

352900

Dichloromethane

162800

Acetone

Melting point (°C)

146.4

Boiling point (°C)

Decomposes before boiling

Degradation point (°C)

289.5

Flashpoint (°C)

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

4.57 X 10⁰³

Calculated

Log P

3.66

High

Fat solubility of residues

Solubility

Insoluble

Data type

Regulatory data - observed in metabolism and farm animal feeding studies

Density (g ml⁻¹)

Dissociation constant pKa) at 25 °C

Not applicable

No dissociation

Vapour pressure at 20 °C (mPa)

1.141 X 10^-03

Low volatility

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

3.521 X 10^-03

Non-volatile

Volatilisation as max % of applied dose lost

From plant surface

From soil surface

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

pH 1.8: 257 & 258 nm = 14055
pH 7.0: 256 & 257 nm = 13863
pH 10.5: 258 & 259 nm = 16384

Surface tension (mN m⁻¹)

65.53

Degradation

Property

Value

Source; quality score; and other information

Interpretation

General biodegradability

Soil degradation (days) (aerobic)

DT₅₀ (typical)

121.2

Persistent

DT₅₀ (lab at 20 °C)

121.2

Persistent

DT₅₀ (field)

71.3

Moderately persistent

DT₉₀ (lab at 20 °C)

503.1

Very persistent

DT₉₀ (field)

344.5

DT₅₀ modelling endpoint

Note

EU dossier Lab studies DT₅₀ range 59.4-217.3 days, DT₉₀ range 197.2-1224 days; Field studies DT₅₀ range 31.5-138.5 days, DT₉₀ range 75.8-682 days

Dissipation rate RL₅₀ (days) on plant matrix

Value

Note

Dissipation rate RL₅₀ (days) on and in plant matrix

Value

Note

Aqueous photolysis DT₅₀ (days) at pH 7

Value

15.4

Slow

Note

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

Value

Stable

Note

Stable at all relevant pH values

Water-sediment DT₅₀ (days)

36.7

Moderately fast

Water phase only DT₅₀ (days)

9.5

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

Soil adsorption and mobility

Property

Value

Source; quality score; and other information

Interpretation

Linear

K_d (mL g⁻¹)

165.4

Non-mobile

K_oc (mL g⁻¹)

9673.8

Notes and range

EU dossier K_d range 61.5-518 mL g⁻¹, K_oc range 5123-17852 mL g⁻¹, soils=6

Freundlich

K_f (mL g⁻¹)

79.1

Non-mobile

K_foc (mL g⁻¹)

6242.6

¹/_n

0.97172

Notes and range

EU dossier K_f range 53.9-1322 mL g⁻¹, K_foc range 4350-45586 mL g⁻¹, ¹/_n range 0.8877-1.1207, soils = 6

pH sensitivity

Fate indices

Property

Value

Source; quality score; and other information

Interpretation

GUS leaching potential index

0.38

Calculated

Low leachability

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

Value

8.64 X 10^-03

Calculated

Note

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

3.31

Calculated using the Atkinson method. Assumed 1.5E+06 OH/cm³, 12 hr

Below the level of concern for long-range air transport

Bio-concentration factor

BCF (l kg⁻¹)

Whole fish

Low potential

CT₅₀ (days)

131

Known soil metabolites

Metabolite

Major/Minor fraction

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

Estimated maximum occurrence fraction

Notes

5-(trifluoromethyl)-1H-pyrazole-3-carboxylic acid (Ref: IN E8S72)

Minor fraction

0.067

1-(2-(4-(4-(5-(2,6-difluorophenyl)-4,5-dihydro-3-isoxazolyl)-2-thiazolyl)-1-piperidinyl)-2-oxoethyl)-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid (Ref: IN RAB06)

Major fraction

0.135

1-(4-(4-(5-(2,6-Difluorophenyl)-4,5-dihydro-3-isoxazolyl)-2-thiazolyl)-4-hydroxy-1-piperidinyl)-2-(5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)ethanone (Ref: IN RDT31)

Minor fraction

0.094

4-(4-(5-(2,6-difluorophenyl)-4,5-dihydro-3-isoxazolyl)-2-thiazolyl)piperidine (Ref: IN QPS10)

Minor fraction

0.087

Known groundwater metabolites

Metabolite

EC SANCO/221/2000 relevancy

ADI (mg kg⁻¹ bodyweight day⁻¹)

WHO drinking water guidance value (μg L⁻¹ day⁻¹)

5-(trifluoromethyl)-1H-pyrazole-3-carboxylic acid (Ref: IN E8S72)

Not relevant

Other known metabolites

None

ECOTOXICOLOGY

Terrestrial ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 5000

Rat

Low

Mammals - Short term dietary NOEL

(mg kg⁻¹)

(ppm diet)

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

> 1013

Rat Reproductive NOAEL

Low

Birds - Acute LD₅₀ (mg kg⁻¹)

> 2250

Colinus virginianus

Low

Birds - Short term dietary (LC₅₀/LD₅₀)

> 1280 mg kg bw⁻¹ day⁻¹

Colinus virginianus

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

106.7

Colinus virginianus

Moderate

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

> 1000

Eisenia foetida

Low

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

=> 1000

Eisenia foetida 56 day

Low

Soil micro-organisms

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

Dose: 15.59 mg kg⁻¹ soil 28 Day

Collembola

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

25.0

Folsomia candida

Non-target plants

Honeybees (Apis spp.)

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

> 100

Apis mellifera

Low

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

> 40.26

Apis mellifera

Moderate

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

Chronic

Notes

Bumblebees (Bombus 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)

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)

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)

Beneficial insects (Lacewings)

3.5% Mortality at dose 5.12 g ha⁻¹

Chrysoperla carnea

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

116.1

Aphidius rhopalosiphi

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

> 200

Typhlodromus pyri

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)

> 0.69

Oncorhynchus mykiss

Moderate

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

> 0.46

Oncorhynchus mykiss 88 day

Moderate

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

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

> 0.67

Daphnia magna

Moderate

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

=> 0.75

Daphnia magna

Moderate

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

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

> 0.64

Americamysis bahia

Moderate

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

> 0.56

Chironomus riparius 48 hr

Moderate

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

0.11

Chironomus riparius

Moderate

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

2.80

Chironomus riparius

Moderate

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

> 0.79

Lemna gibba

Moderate

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

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

> 0.351

Skeletonema costatum

Moderate

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)

> 5000

Rat

Low

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

5000

Rat

Mammals - Inhalation LC₅₀ (mg l⁻¹)

>= 5.0

Rat 4 hr (nose only)

Other Mammal toxicity endpoints

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

1.04

Rat SF=100

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

None allocated

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

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

0.04

Dermal penetration studies (%)

0.7

Dangerous Substances Directive 76/464

Exposure Routes

Public

Low risk based on proposed uses

Occupational

Low risk based on proposed uses

MRLs

European

EU MRL pesticide database

Great Britain

GB MRL Register

Notes

Amendment to GB MRL regulation for oxathiapiprolin/spring onions June 2023

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

Mammalian dose elimination route and rate

Health issues

Specific human health issues

Carcinogen

Genotoxic

Endocrine disruptor

; ; ; ;

No data found

Reproduction / development effects

Acetyl cholinesterase inhibitor

Neurotoxicant

No data found

Respiratory tract irritant

Skin irritant

Skin sensitiser

Eye irritant

Phototoxicant

No data found

General human health issues

Possible liver & gall bladder toxicant

Handling issues

Property

Value and interpretation

General

Not explosive or oxidising
Not expected to auto-ignite; Not highly flammable

CLP classification 2013

Environment: H400, H410

WHO Classification

Not listed (Not listed)

UN Number

Waste disposal & packaging

Shelf-life, storage, stability and reactivity

TRANSLATIONS

Language

Name

English

oxathiapiprolin

French

oxathiapiproline

German

Danish

Italian

Spanish

Greek

Polish

Swedish

Hungarian

Dutch

Norwegian

oksatiapiprolin

Record last updated:	22/05/2025
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