Pyribenzoxim (Ref: LGC 40863 )-Pesticide database

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Pyribenzoxim (Ref: LGC 40863 )

(Also known as: pyanchor)

Pyribenzoxim is a post-emergence herbicide. It has a low aqueous solubility and is volatile. Whilst data is sparse it indicates that the chemical is not persistent in soil systems. It has a low mammalian toxicity and is a recognised irritant. It is moderately toxic to birds, fish and honey bees.

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 Low alert: Non-persistent; GUS: Low leachability; Drainflow: Non-mobile	Ecotoxicity Low alert: Fish acute ecotoxicity: Low; Daphnia acute ecotoxicity: Low; Bees acute unknown ecotoxicity: Low Warning: Significant data are missing	Human health Low alert Warning: Significant data are missing

GENERAL INFORMATION

Used post-emergence to control grasses and polygonums in rice and other crops

Example pests controlled

Barnyard grass; Blackgrass; Knotweed

Example applications

Efficacy & activity

Availability status

Introduction & key dates

UK regulatory status

UK COPR regulatory status

Date COPR inclusion expires

UK LERAP status

No UK approval for use

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Dossier rapporteur/co-rapporteur

Date EC 1107/2009 inclusion expires

EU Candidate for substitution (CfS)

Listed in EU database

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

Chemical structure

Chemical formula

C₃₂H₂₇N₅O₈

Canonical SMILES

COC1=CC(=NC(=N1)OC2=C(C(=CC=C2)OC3=NC(=CC(=N3)OC)OC)C(=O)ON=C(C4=CC=CC=C4)C5=CC=CC=C5)OC

Isomeric SMILES

International Chemical Identifier key (InChIKey)

OVXMBIVWNJDDSM-UHFFFAOYSA-N

International Chemical Identifier (InChI)

InChI=1S/C32H27N5O8/c1-39-24-18-25(40-2)34-31(33-24)43-22-16-11-17-23(44-32-35-26(41-3)19-27(36-32)42-4)28(22)30(38)45-37-29(20-12-7-5-8-13-20)21-14-9-6-10-15-21/h5-19H,1-4H3

2D structure diagram/image available?

Substance groups

Pyrimidinyloxybenzoic acid herbicide

Minimum active substance purity

Known relevant impurities

Substance origin

Broad spectrum, inhibits plant amino acid synthesis - acetohydroxyacid synthase AHAS.

US EPA chemical code

CLP index number

PIN (Preferred Identification Name)

N-({2,6-bis[(4,6-dimethoxypyrimidin-2-yl)oxy]benzoyl}oxy)-1,1-diphenylmethanimine

benzophenone O-[2,6-bis(4,6-dimethoxypyrimidin-2-yloxy)benzoyl]oxime

diphenylmethanone O-(2,6-bis((4,6-dimethoxy-2-pyrimidinyl)oxy)benzoyl)oxime

Other status information

Relevant Environmental Water Quality Standards

Herbicide Resistance Classification (HRAC)

Herbicide Resistance Classification (WSSA)

Insecticide Resistance Classification (IRAC)

Fungicide Resistance Classification (FRAC)

Examples of recorded resistance

White to pale yellow coloured solid

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

LG Chemicals, Korea

Example products using this active

Kiljabigold
Pyanchor

Formulation and application details

Usually supplied as an emulsifiable concentrate

ENVIRONMENTAL FATE

Source; quality score; and other information

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

R4 R = Peer reviewed scientific publications
4 = Verified data

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

Melting point (°C)

R4 R = Peer reviewed scientific publications
4 = Verified data

Boiling point (°C)

E3 E = Manufacturers safety data sheets
3 = Unverified data of known source

Degradation point (°C)

Flashpoint (°C)

E3 E = Manufacturers safety data sheets
3 = Unverified data of known source

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

R4 R = Peer reviewed scientific publications
4 = Verified data

Fat solubility of residues

Density (g ml⁻¹)

E3 E = Manufacturers safety data sheets
3 = Unverified data of known source

Dissociation constant pKa) at 25 °C

Vapour pressure at 20 °C (mPa)

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

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

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

Surface tension (mN m⁻¹)

Source; quality score; and other information

General biodegradability

Soil degradation (days) (aerobic)

DT₅₀ (typical)

DT₅₀ (lab at 20 °C)

DT₅₀ (field)

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

DT₉₀ (lab at 20 °C)

DT₉₀ (field)

DT₅₀ modelling endpoint

Dissipation rate RL₅₀ on plant matrix

Dissipation rate RL₅₀ on and in plant matrix

R3 R = Peer reviewed scientific publications
3 = Unverified data of known source

Rice whole pant matrix, n=1

Aqueous photolysis DT₅₀ (days) at pH 7

R4 R = Peer reviewed scientific publications
4 = Verified data

(distilled water)

Moderately fast

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

R4 R = Peer reviewed scientific publications
4 = Verified data

(de-aerated distilled water)

Water-sediment DT₅₀ (days)

Water phase only DT₅₀ (days)

Soil adsorption and mobility

Source; quality score; and other information

Notes and range

R4 R = Peer reviewed scientific publications
4 = Verified data

Notes and range

Literature data: K_f range 2100 (clay) - 20654 (silt loam) mL g⁻¹, K_foc values range 85700 (clay) - 2470000 (silt loam) mL g⁻¹

Source; quality score; and other information

GUS leaching potential index

Low leachability

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

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

Potential for loss via drain flow

Bio-concentration factor

BCF (l kg⁻¹)

CT₅₀ (days)

Known metabolites

None

Terrestrial ecotoxicology

Source; quality score; and other information

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

R4 R = Peer reviewed scientific publications
4 = Verified data

Mammals - Short term dietary NOEL

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

Birds - Acute LD₅₀ (mg kg⁻¹)

Birds - Short term dietary (LC₅₀/LD₅₀)

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

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

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

Soil micro-organisms

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)

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

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

L2 L = Pesticide manuals and hard copy reference books / other sources
2 = Unverified data of unknown source

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)

Beneficial insects (Parasitic wasps)

Beneficial insects (Predatory mites)

Beneficial insects (Ground beetles)

Aquatic ecotoxicology

Source; quality score; and other information

Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

R3 R = Peer reviewed scientific publications
3 = Unverified data of known source

Orizias ¡atipes

Fish - Chronic 21 day NOEC (mg l⁻¹)

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

R4 R = Peer reviewed scientific publications
4 = Verified data

Daphnia magna

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

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

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

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 - Acute 7 day EC₅₀, biomass (mg l⁻¹)

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

R3 R = Peer reviewed scientific publications
3 = Unverified data of known source

Unknown species

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

Mesocosm study data

NOEAEC mg l⁻¹

NOEAEC mg l⁻¹

HUMAN HEALTH AND PROTECTION

Source; quality score; and other information

Threshold of Toxicological Concern (Cramer Class)

High (class III)

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

R4 R = Peer reviewed scientific publications
4 = Verified data

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

R4 R = Peer reviewed scientific publications
4 = Verified data

Mammals - Inhalation LC₅₀ (mg l⁻¹)

Other Mammal toxicity endpoints

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

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

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

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

Dermal penetration studies (%)

Dangerous Substances Directive 76/464

Exposure Routes

EU MRL pesticide database

GB MRL Register

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

Mammalian dose elimination route and rate

Specific human health issues

Endocrine disruptor

XNo, known not to cause a problem

A0 A = Chromosome aberration (EFSA database)
0 = No data

B0 B = DNA damage/repair (EFSA database)
0 = No data

C0 C = Gene mutation (EFSA database)
0 = No data

D0 D = Genome mutation (EFSA database)
0 = No data

E0 E = Unspecified genotoxicity type (miscellaneous data source)
0 = No data

Reproduction / development effects

Acetyl cholinesterase inhibitor

XNo, known not to cause a problem

Respiratory tract irritant

Skin sensitiser

✓Yes, known to cause a problem

✓Yes, known to cause a problem

✓Yes, known to cause a problem

General human health issues

Harmful via inhalation, ingestion and in contact with skin

Handling issues

Value and interpretation

No information available

CLP classification 2013

WHO Classification

Waste disposal & packaging

Shelf-life, storage, stability and reactivity

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