INTERNATIONAL UNION
   OF PURE AND APPLIED
   CHEMISTRY
contact
dicamba (Ref: SAN 837H)
** dianat ** disugran ** dicamba acid ** Translations

Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home

SUMMARY

Dicamba is a selective, systemic herbicide approved for use in the EU and used for general weed control. It is highly soluble in water, volatile and has a low potential to leach to groundwater based on its chemical properties. It is not persistent in soil but, under certain conditions, it may persist in aquatic systems. It is moderately toxic to mammals but has a low potential to bioaccumulate. It is an irritant. it is moderately toxic to birds, most aquatic species, honeybees and earthworms.

GENERAL INFORMATION Click here for an explantaion of the general chemical status information
for dicamba

Description: A herbicide for control of annual and perennial broad-leaved weeds and brush species

Example pests controlled: Bedstraw; Buttercup; Carpetwed; Cocklebur; Lambsquarters; Mallow; Goosefoot; Pigweed; Sowthistle; Velvetleaf; Knapweed; Teasel; Plantains; Bindweed; Thistles

Example applications: Corn; Cotton; Sugarcane; Soybeans; Sorghum; Asparagus; Grass seed crops; Non-cropland

Efficacy & activity: -

Availability status: Current

Introduction & key dates: circa 1963

EC Regulation 1107/2009 (repealing 91/414):
Status Approved
Dossier rapporteur/co-rapporteur Denmark
Date inclusion expires 31/12/2018
EU Candidate for substitution (CfS) No
Listed in EU database Yes

Approved for use () or known to be used () in the following European countries: Click to access a note on the approvals information on this site

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: Click here for further information on the general chemical status information used on this site
Isomerism Isomeric - also occurs as 3,5-dichloro-2-methoxybenzoic acid
Chemical formula C8H6Cl2O3
Canonical SMILES COC1=C(C=CC(=C1C(=O)O)Cl)Cl
Isomeric SMILES Clc1ccc(Cl)c(c1OC)C(=O)O
International Chemical Identifier key (InChIKey) IWEDIXLBFLAXBO-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C8H6Cl2O3/c1-13-7-5(10)3-2-4(9)6(7)8(11)12/h2-3H,1H3,(H,11,12)
2D structure diagram/image available? Yes

Click to access the Cambridge Crystallographic Data Centre (CCDC) website
Cambridge Crystallographic Data Centre diagrams:
Common Name Relationship Link
Dicamba Unstated isomer Click here for the CCDC structure diagram

General status: Click here for further information on the general chemical status information used on this site
Pesticide type Herbicide
Substance group Benzoic acid
Minimum active substance purity 850 g/kg
Known relevant impurities EU dossier - None declared
Substance origin Synthetic
Mode of action Selective, systemic, absorbed through leaves and translocates throughout plant. Synthetic auxin.
CAS RN 1918-00-9
EC number 217-635-6
CIPAC number 85
US EPA chemical code 029801
PubChem CID 3030
Molecular mass (g mol-1) 221.04
PIN (Preferred Identification Name) 3,6-dichloro-2-methoxybenzoic acid
IUPAC name 3,6-dichloro-o-anisic acid
CAS name 3,6-dichloro-2-methoxybenzoic acid
Other status information Potential groundwater contaminant
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 granules
Related substances & organisms

Formulations:
Property Click here for information on the general product and branding information used on this site Value
Example manufacturers & suppliers of products using this active now or historically
  • Certis
  • Headland
  • Nufarm UK
  • Scotts
  • Bayer
Example products using this active
  • Di-Farmon R
  • Foundation
  • Prompt
  • Relay P
  • Banval
  • Xtendimax
UK LERAP status None
Formulation and application details Often supplied as a soluble concentrate that is mixed with water and applied as a spray.


ENVIRONMENTAL FATE

for dicamba

Property Click here for information on the parameters used to describe environmental fate on this site Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with fate data Interpretation Click here for information on the way in which we interpret environmental fate data
Solubility - In water at 20oC (mg l-1) 250000 A5 High
Solubility - In organic solvents at 20oC (mg l-1) 500000 A5 - Acetone -
2800 A5 - Hexane -
500000 A5 - Methanol -
500000 A5 - Ethyl acetate -
Melting point (oC) 115 A5 -
Boiling point (oC) Decomposes before boiling A5 -
Degradation point (oC) 230 A5 -
Flashpoint (oC) Not expected to self ignite; Not highly flammable A5 -
Octanol-water partition coefficient at pH 7, 20oC P 1.32 X 10-02 Calculated -
Log P -1.88 A5 Low
Bulk density (g ml-1)/Specific gravity 1.484 A5 -
Dissociation constant (pKa) at 25oC 1.87 A5 -
Note: Strong acid
Vapour pressure at 20oC (mPa) 1.67 A5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 1.0 X 10-04 A5 Non-volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index 1.75 Calculated Low leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Click here for a note on the limitations of the SCI-GROW index Value 3.77 X 10-03 Calculated -
Note -
Potential for particle bound transport index Click here for a note on the limitations of the potential for particle bound transport index - Calculated Low
Maximum UV-vis absorption L mol-1 cm-1 Neutral solution: 228nm = 10130, 280nm = 737; [Acidic solution: 228nm = 10119/10522, 280nm = 1028/350 A5 -
Surface tension (mN m-1) 63.7 A5 -

Degradation:
Property Click here for information on the parameters used to describe substance degradation Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with degradation data Interpretation Click here for information on the way in which we interpret substance degradation data
General biodegradability -
Soil degradation (days) (aerobic) DT50 (typical) 4.0 A5 Non-persistent
DT50 (lab at 20oC) 4.0 A5 Non-persistent
DT50 (field) 3.9 A5 Non-persistent
DT90 (lab at 20oC) 13.4 A5 -
DT90 (field) 13.2 A5 -
DT50 modelling endpoint - - -
Note EU dossier lab aerobic studies DT50 range 2.1-10.5 days, DT90 range 7.0-20.9 days, field studies DT50 range 3.2-4.9 days, DT90 range 10.8-18.4 days; Other sources: DT50 14-25 days (R3)
Dissipation rate RL50 on plant matrix Value 9.5 R3 -
Note Grass, n=1
Dissipation rate RL50 on and in plant matrix Value 5.7 R4 -
Note Published literature RL50 range 2.9-8.5 days, Kentucky bluegrass thatch, n=2
Aqueous photolysis DT50 (days) at pH 7 Value 50.3 A5 Stable
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value Stable A5 -
Note Stable pH 7 to pH 9
Water-sediment DT50 (days) 41 A5 Moderately fast
Water phase only DT50 (days) 40 A5 Stable

Soil adsorption and mobility:
Property Click here for information on the parameters used to describe substance adsorption and mobility Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with adsorption and mobility data Interpretation Click here for information on the way in which we interpret substance adsorption and mobility
Linear Kd - - -
Koc -
Notes and range -
Freundlich Kf 0.25 A5 Very mobile
Kfoc 12.36
1/n 0.74
Notes and range EU dossier Kf range 0.10-0.53, Kfoc range 3.45-21.2 mL/g, 1/n range 0.62-0.80, Soils=4
pH sensitivity No

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
3,6-dichlorosalicylic acid (Ref: NOA 414746) This metabolite may cause environmental pollution, click here for further information Soil   0.588   Major fraction, Relevant

Other known metabolites:
Metabolite name and reference Aliases Formation medium / Rate Estimated maximum occurrence fraction Metabolising enzymes
2,5-dichlorphenol DCP Animal - -
2-amino-3,6-dichlorophenol - Animal - -
(Ref: NOA 405873) 5-hydroxy dicamba; 5-OH dicamba Plant; Rat (Urinary) - -


ECOTOXICOLOGY

for dicamba

Property Click here for information on the parameters used to describe substance ecotoxicology Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with ecotoxicology data Interpretation Click here for information on the way in which we interpret substance ecotoxicology
Bio-concentration factor BCF (l kg-1) 15 E2 Low potential
CT50 (days) Not available -
Mammals - Acute oral LD50 (mg kg-1) 1581 A5 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) > 110 L2 Rat, 2 year Moderate
(ppm diet) - -
Birds - Acute LD50 (mg kg-1) 1373 A5 Anas platyrhynchos Moderate
Birds - Short term dietary (LC50/LD50) > 10000 mg kg feed-1 A5 Anas platyrhynchos -
Fish - Acute 96 hour LC50 (mg l-1) > 100 A5 Oncorhynchus mykiss Low
Fish - Chronic 21 day NOEC (mg l-1) 180 A5 Oncorhynchus mykiss Low
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) > 41.0 A5 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 97 A5 Daphnia magna Low
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1) 6.8 A5 Mysidopsis bahia Moderate
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) 0.45 E4 Lemna minor Moderate
Non-target plants 97 A5 Beta vulgaris
Seedling emergence, ER50
as g/ha
-
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 1.8 A5 Skeletonema costatum, Biomass Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1) 25 Q2 Unknown species Low
Honeybees Contact acute 48 hour LD50 (μg bee-1) > 100 A5 Low
Oral acute 48 hour LD50 (μg bee-1) > 100 A5 Low
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) > 1000 A5 Eisenia foetida Low
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-1 232.6 Mortality (glass)
A5 Typhlodromus pyri
-
% Effect - - -
Other arthropod (2) LR50 g ha-1 356 Mortality
A5 Aphidius rhopalosiphi
-
% Effect - - -
Soil micro-organisms Nitrogen mineralisation: No significant adverse effect
Carbon mineralisation: No significant adverse effect
A5
Dose: 6.4 mg kg-1 soil, 28 days
-
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for dicamba

General:
Property Click here for information on the parameters used to describe human health and protection issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with human health and protection data Interpretation Click here for information on the way in which we interpret human health and protection data
Threshold of Toxicological Concern (Cramer Class) Click here for a note on the limitations of the Cramer class High (class III) - -
Mammals - Acute oral LD50 (mg kg-1) 1581 A5 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 2000 A5 Rabbit -
Mammals - Inhalation LC50 (mg l-1) 4.46 A5 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.3 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) 0.3 A5 Rabbit, SF=100 -
Dermal penetration studies (%) 0.002-3.4 A5 concentrate dependent -
Dangerous Substances Directive 76/464 - - -
Exposure Limits - - -
Exposure Routes Public Negligible risk to bystanders
Occupational No unacceptable risks to operators or other farm workers identified
European MRLs Click here for the EU MRL pesticide database
Drinking Water Standards - - -
Drinking Water MAC (μg l-1) 0.1 EU Dir 89/778/EC limit; A5 -

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 Harmful if swallowed
Possible 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 Click here for information on the parameters used to describe substance handling issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with data on handling issues Interpretation Click here for information on the way in which we interpret data on handling issues
General Click here for a description of the International Maritime Dangerous Goods (IMDG) codes Corrosive
Not explosive or oxidising
IMDG Transport Code is usually 9
CLP classification 2013 Health: H302, H318
Environment: H412
EC Risk Classification Click here to view information omn the EU risk phrases Xn - Harmful: R22, R41
N - Dangerous for the environment: R52, R53
EC Safety Classification Click here to view information omn the EU safety phrases S2, S22, S61
WHO Classification II - Moderately hazardous
US EPA Classification (formulation) III - Caution - Slightly toxic
UN Number Usually 3077
Waste disposal & packaging Click here for a description of UN packaging marks Packaging Group III (minor danger)


TRANSLATIONS

for dicamba

Language Name
English dicamba
French dicamba
German Dicamba
Danish dicamba
Italian dicamba
Spanish dicamba
Greek dicamba
Slovenian dikamba
Polish dikamba
Swedish dikamba
Hungarian dikamba
Dutch dicamba

Record last updated: Friday 09 November 2018
Contact: aeru@herts.ac.uk
© University of Hertfordshire