triclopyr ** Translations

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GENERAL INFORMATION
for triclopyr

Description: A herbicide for perennial broad-leaved and woody weed control mainly on uncultivated areas

Example pests controlled: Alder; Blackberry; Boxelder; Buckthorn; Cottonwood; Gorse; Hawthorn; Mulberry; Sassafras; Wild rose; Burdock; Curly dock; Canada thistle; Mustard; Lambsquarter

Example applications: Uncultivated areas; Grassland; Plantations; Rangeland; Right-of-way; Industrial sites; Ornamental turf; Rice

Efficacy & activity: -

Availability status: Current

Introduction & key dates: 1979

EC Regulation 1107/2009 (repealing 91/414):

Status	Approved
Dossier rapporteur/co-rapporteur	Poland/Hungary
Date inclusion expires	30/04/2020
EU Candidate for substitution (CfS)	No
Listed in EU database	Yes

Approved for use () or known to be used () in the following European countries:

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

Also used in: Australia, USA

Chemical structure:

Isomerism	-
Chemical formula	C7H4Cl3NO3
Canonical SMILES	C1=C(C(=NC(=C1Cl)Cl)OCC(=O)O)Cl
Isomeric SMILES	No data
International Chemical Identifier key (InChIKey)	REEQLXCGVXDJSQ-UHFFFAOYSA-N
International Chemical Identifier (InChI)	InChI=1S/C7H4Cl3NO3/c8-3-1-4(9)7(11-6(3)10)14-2-5(12)13/h1H,2H2,(H,12,13)
2D structure diagram/image available?	Yes

General status:

Pesticide type	Herbicide
Substance group	Pyridine compound
Minimum active substance purity	960g/kg as butoxyethyl ester
Known relevant impurities	EU dossier - None declared
Substance origin	Synthetic
Mode of action	Selective, systemic, absorbed through roots and foliage. Synthetic auxin.
CAS RN	55335-06-3
EC number	259-597-3
CIPAC number	376
US EPA chemical code	116001
PubChem CID	41428
Molecular mass (g mol-1)	256.5
PIN (Preferred Identification Name)	[(3,5,6-trichloropyridin-2-yl)oxy]acetic acid
IUPAC name	3,5,6-trichloro-2-pyridyloxyacetic acid
CAS name	((3,5,6-trichloro-2-pyridinyl)oxy)acetic acid
Other status information	Potential groundwater pollutant
Relevant Environmental Water Quality Standards	-
Herbicide Resistance Classification (HRAC)	O
Herbicide Resistance Classification (WSSA)	4
Insecticide Resistance Classification (IRAC)	Not applicable
Fungicide Resistance Classification (FRAC)	Not applicable
Examples of recorded resistance	-
Physical state	White solid
Related substances & organisms	aminopyralid clopyralid fluroxypyr dicamba 2,4-D

Formulations:

Property	Value
Example manufacturers & suppliers of products using this active now or historically	AgriGuard Dow AgroSciences Headland Nomix Environ Nufarm UK Scotts
Example products using this active	Blastor T Doxstar Grazon 90 Garlon 4
UK LERAP status	Buffer probably required in UK - see product label
Formulation and application details	Usually formulated as an emulsifiable concentrate.

ENVIRONMENTAL FATE
for triclopyr

Property		Value	Source/Quality Score/Other Information	Interpretation
Solubility - In water at 20oC (mg l-1)		8100	A5	High
Solubility - In organic solvents at 20oC (mg l-1)		90	A5 - Hexane	-
		19000	A5 - Toluene	-
		665000	A5 - Methanol	-
		582000	A5 - Acetone	-
Melting point (oC)		150	A5	-
Boiling point (oC)		Decomposes before boiling	A5	-
Degradation point (oC)		208	A5	-
Flashpoint (oC)		Not expected to self ignite; Not highly flammable	A5	-
Octanol-water partition coefficient at pH 7, 20oC	P	4.17 X 1004	Calculated	-
	Log P	4.62	A5	High
Bulk density (g ml-1)/Specific gravity		1.3	A5	-
Dissociation constant (pKa) at 25oC		3.97	L3	-
		Note: Weak acid
Vapour pressure at 20oC (mPa)		0.1	A5	Low volatility
Henry's law constant at 25oC (Pa m3 mol-1)		2.90 X 10-03	A5	Non-volatile
GUS leaching potential index		3.69	Calculated	High leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate	Value	6.85 X 10-01	Calculated	-
	Note	-
Potential for particle bound transport index		-	Calculated	Low
Maximum UV-vis absorption L mol-1 cm-1		-	-	-
Surface tension (mN m-1)		71.6	A5 at 21oC, 99.4%	-

Degradation:

Property		Value	Source/Quality Score/Other Information	Interpretation
General biodegradability		-
Soil degradation (days) (aerobic)	DT50 (typical)	39	A5	Moderately persistent
	DT50 (lab at 20oC)	39	A5	Moderately persistent
	DT50 (field)	30	A5	Moderately persistent
	DT90 (lab at 20oC)	105	A5	-
	DT90 (field)	153.9	A5	-
	DT50 modelling endpoint	-	-	-
	Note	EU dossier lab studies DT50 range 13-52 days, DT90 range 44-171 days; field studies DT50 range 6.9-53.9 days
Dissipation rate RL50 on plant matrix	Value	-	-	-
	Note	-
Dissipation rate RL50 on and in plant matrix	Value	10.9	R4	-
	Note	Published literature RL50 range 4.0-17.8 days, 2 field grown crops, leaves, n=2
Aqueous photolysis DT50 (days) at pH 7	Value	0.1	A5	Fast
	Note	-
Aqueous hydrolysis DT50 (days) at 20oC and pH 7	Value	8.7	A5	Non-persistent
	Note	pH and temperature sensitive: DT50 84 days at pH 5 and 25 degC, 26 days at pH 5 and 35 degC, 8.7 days at pH 7 and 25 degC, 2.3 days at pH 7 and 35 degC, 0.3 days at pH 9 and 25 degC, 0.06 days at pH 9 and 35 degC
Water-sediment DT50 (days)		29.2	A5	Fast
Water phase only DT50 (days)		24.8	A5	Slow

Soil adsorption and mobility:

Property		Value	Source/Quality Score/Other Information	Interpretation
Linear	Kd	-	DW4	Mobile
	Koc	27
	Notes and range	-
Freundlich	Kf	2.36	A5	Mobile
	Kfoc	48
	1/n	0.81
	Notes and range	EU dossier kf range 0.683-6.40, Kfoc range 40.6-59.3 mL/g, 1/n range 0.75-0.89, Soils=5; Literature mean: Kf = 5.2 mL/g, Kfoc = 56.7 mL/g, 1/n = 0.898, Soils = 7
pH sensitivity		No

Key metabolites:

Metabolite		Formation medium	Estimated maximum occurrence fraction	1107/2009 relevancy
3,5,6-trichloro-2-pyridinol		Soil	0.331	Major fraction; Relevant

Other known metabolites:

Metabolite name and reference	Aliases	Formation medium / Rate	Estimated maximum occurrence fraction	Metabolising enzymes
3,6-dichloro-2-pyridinol	-	Water/sediment	-	-
6-chloro-2-pyridinol	-	Water/sediment	-	-
3,5,6-trichloro-2-methoxypyridine	-	Plant	-	-

ECOTOXICOLOGY
for triclopyr

Property		Value	Source/Quality Score/Other Information	Interpretation
Bio-concentration factor	BCF (l kg-1)	0.77	A5 (Other literature Log BCF range -0.3-0.04 (R3))	Low potential
	CT50 (days)	14		-
Mammals - Acute oral LD50 (mg kg-1)		630	A5 Rat	Moderate
Mammals - Short term dietary NOEL	(mg kg-1)	3	L2 Rat, 2 year	High
	(ppm diet)	-		-
Birds - Acute LD50 (mg kg-1)		1698	A5 Anas platyrhynchos	Moderate
Birds - Short term dietary (LC50/LD50)		> 5620 mg kg feed-1	A5 Anas platyrhynchos	-
Fish - Acute 96 hour LC50 (mg l-1)		117	A5 Oncorhynchus mykiss	Low
Fish - Chronic 21 day NOEC (mg l-1)		46.3	A4 Unknown species	Low
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1)		> 131	A5 Daphnia magna	Low
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1)		48.5	A4 Unknown species	Low
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)		23.0	A5 Chironomus riparius	Low
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1)		-	-	-
Aquatic plants - Acute 7 day EC50, biomass (mg l-1)		0.8	F4 Lemna gibba	Moderate
Non-target plants		-	-	-
		-	-	-
Algae - Acute 72 hour EC50, growth (mg l-1)		75.8	A5 Raphidocelis subcapitata	Low
Algae - Chronic 96 hour NOEC, growth (mg l-1)		8	Q2 Unknown species	Low
Honeybees	Contact acute 48 hour LD50 (μg bee-1)	> 100	A5	Low
	Oral acute 48 hour LD50 (μg bee-1)	-	-	-
	Unknown mode acute 48 hour LD50 (μg bee-1)	-	-	-
Earthworms - Acute 14 day LC50 (mg kg-1)		> 521	A5 Eisenia foetida, corr	Moderate
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1)		-	-	-
Other soil macro-organisms - e.g. Collembola	LR50 / EC50 / NOEC / % Effect	-	-	-
Other arthropod (1)	LR50 g ha-1	-	-	-
	% Effect	-	-	-
Other arthropod (2)	LR50 g ha-1	-	-	-
	% Effect	-	-	-
Soil micro-organisms		-	-	-
Mesocosm study data	NOEAEC mg l-1	-	-	-
	NOEAEC mg l-1	-	-	-

HUMAN HEALTH AND PROTECTION
for triclopyr

General:

Property		Value	Source/Quality Score/Other Information	Interpretation
Threshold of Toxicological Concern (Cramer Class)		High (class III)	-	-
Mammals - Acute oral LD50 (mg kg-1)		630	A5 Rat	Moderate
Mammals - Dermal LD50 (mg kg-1 body weight)		> 2000	A5 Rat	-
Mammals - Inhalation LC50 (mg l-1)		> 4.8	A5 Rat	-
Other Mammal toxicity endpoints		-		-
ADI - Acceptable Daily Intake (mg kg-1bw day-1)		0.03	A5 Rat, SF=100	-
ARfD - Acute Reference Dose (mg kg-1bw day-1)		0.3	A5 Rabbit, SF=100	-
AAOEL - Acute Acceptable Operator Exposure Level (mg kg-1 bw day-1)		-	-	-
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1)		0.05	A5 Rat, SF=100	-
Dermal penetration studies (%)		10-18	A5 concentration dependent	-
Dangerous Substances Directive 76/464		-	-	-
Exposure Limits		-	-	-
Exposure Routes	Public	No unacceptable risks to bystanders identified
	Occupational	Risk to operators but acceptable under label recommendations for use for personal protection clothing and equipment
European MRLs		Click here for the EU MRL pesticide database
Drinking Water Standards		-	-	-
Drinking Water MAC (μg l-1)		-	-	-

Health issues:

Carcinogen	Mutagen	Endocrine disrupter	Reproduction / development effects	Cholinesterase inhibitor	Neurotoxicant
		-			-
Respiratory tract irritant	Skin irritant	Skin sensitiser	Eye irritant	Phototoxicant
-				-
General human health issues		Highly toxic Heart, kidney and liver toxicant

: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data found

Handling issues:

Property		Value	Source/Quality Score/Other Information	Interpretation
General		Not explosive IMDG Transport Code is usually 9
CLP classification 2013		Health: H319, H373 Environment: H410
EC Risk Classification		Reproduction risk category 3: R63 Xn - Harmful: R22, R43 Xi - Irritant: R36 N - Dangerous for the environment: R52
EC Safety Classification		-
WHO Classification		II	-	Moderately hazardous
US EPA Classification (formulation)		III	-	Caution - Slightly toxic
UN Number		Usually 3082
Waste disposal & packaging		Packaging Group III (minor danger)

TRANSLATIONS
for triclopyr

Language	Name
English	triclopyr
French	triclopyr
German	Triclopyr
Danish	triclopyr
Italian	triclopir
Spanish	triclopir
Greek	-
Slovenian	triklopir
Polish	trichlopyr
Swedish	-
Hungarian	triklopyr
Dutch	-

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Record last updated: Wednesday 03 April 2019
Contact: aeru@herts.ac.uk