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omethoate (Ref: ENT 25776)
** dimethoate-met ** dimethoxon ** Translations

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

GENERAL INFORMATION
for omethoate

Description: An insecticide and acaricide to control a wide range of pests on fruit, hops and other crops. Also a pesticide transformation product

Example pests controlled: Aphids; Mites; Caterpillars; Beetles; Mealybugs; Scale

Example applications: Fruit including citrus, apples, plum; Hops; Sugarbeet; Potatoes; Cereals; Ornamentals

Availability status: Current

Introduction & key dates: circa 1960

EC Regulation 1107/2009 (repealing 91/414):
Status Not approved
Dossier rapporteur/co-rapporteur Not applicable
Date inclusion expires Expired

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

General status:
Pesticide type Insecticide, Acaricide, Metabolite
Metabolite Type Soil
Substance group Organophosphate
Minimum active substance purity -
Known relevant impurities -
Substance origin Synthetic
Mode of action Systemic with contact and stomach action. Cholinesterase inhibitor.
CAS RN 1113-02-6
EC number 214-197-8
CIPAC number 202
US EPA chemical code -
Chiral molecule No
Chemical formula C5H12NO4PS
SMILES O=C(NC)CSP(=O)(OC)OC
International Chemical Identifier key (InChIKey) PZXOQEXFMJCDPG-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C5H12NO4PS/c1-6-5(7)4-12-11(8,9-2)10-3/h4H2,1-3H3,(H,6,7)
Structure diagram/image available? Yes
Molecular mass (g mol-1) 213.2
PIN (Preferred Identification Name) -
IUPAC name 2-dimethoxyphosphinoylthio-N-methylacetamide
CAS name O,O-dimethyl S-[2-(methylamino)-2-oxoethyl] phosphorothioate
Other status information Chemical subject to PIC regulations
Herbicide Resistance Classification (HRAC) Not applicable
Herbicide Resistance Classification (WSSA) Not applicable
Insecticide Resistance Classification (IRAC) 1B
Fungicide Resistance Classification (FRAC) Not applicable
Examples of recorded resistance Leptinotarsa decemlineata
Aonidella aurantii
Aphis gossypii
Macrosiphum avenae
Myzus persicae
many others
Physical state Colourless liquid
Related substances & organisms -

Can be a metabolite of:
Parent Formation medium Estimated maximum occurrence fraction 91/414 relevancy
dimethoate Soil   0.020   Minor fraction, Not relevant

Formulations:
Property Value
Example manufacturers & suppliers of products using this active now or historically
  • Bayer CropScience
  • King Tech Corp.
Example products using this active
  • Le-ma 290 SL
  • Atease
  • Modern
  • Folimat
UK LERAP status No UK approval for use or outside scope
Formulation and application details Usually supplied as a soluble concentrate or emulsifiable concentrate.


ENVIRONMENTAL FATE

for omethoate

Property Value Source/Quality Score/Other Information Interpretation
Solubility - In water at 20oC (mg l-1) 10000 K4 High
Solubility - In organic solvents at 20oC (mg l-1) Miscible L3 - Acetone -
Miscible L3 - Methanol -
Melting point (oC) -28 L3 - Solidifies -
Boiling point (oC) 135 V3 -
Degradation point (oC) - - -
Flashpoint (oC) 128 L3 -
Octanol-water partition coefficient at pH 7, 20oC P 1.82 X 10-01 Calculated -
Log P -0.74 B5 Low
Bulk density (g ml-1)/Specific gravity 1.32 B5 -
Dissociation constant (pKa) at 25oC - - -
Note:
Vapour pressure at 25oC (mPa) 3.3 B5 Volatile
Henry's law constant at 25oC (Pa m3 mol-1) 4.62 X 10-09 V3 Non-volatile
Henry's law constant at 20oC (dimensionless) 2.90 X 10-08 K3 Non-volatile
GUS leaching potential index 1.07 Calculated Low leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Value 2.36 X 10-03 Calculated -
Note -
Potential for particle bound transport index - Calculated Low
Maximum UV-vis absorption L mol-1 cm-1 - - -
Surface tension (mN m-1) - - -

Degradation:
Property Value Source/Quality Score/Other Information Interpretation
Soil degradation (days) (aerobic) DT50 (typical) 14 B5 Non-persistent
DT50 (lab at 20oC) 2.8 E4 Non-persistent
DT50 (field) 14 B5 Non-persistent
DT90 (lab at 20oC) - - -
DT90 (field) - - -
Note: -
Foliar DT50 (days) Value - - -
Note -
Aqueous photolysis DT50 (days) at pH 7 Value Stable B4 Stable
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 17 B5 Non-persistent
Note -
Water-sediment DT50 (days) 4.5 K4 Fast
Water phase only DT50 (days) - - -

Soil adsorption and mobility:
Property Value Source/Quality Score/Other Information Interpretation
Linear Kd 0.53 A5 Mobile
Koc 41.3
Notes and range EU dossier Kd range 0.20-0.99 mL/g, Koc range16-87 mL/g, Soils=3
Freundlich Kf - - -
Kfoc -
1/n -
Notes and range -
pH sensitivity -

Other known metabolites:
Metabolite name and reference Aliases Formation medium / Rate Estimated maximum occurrence fraction Metabolising enzymes
dimethylthiophosphate DMTP Mammals - -
dimethylphosphate DMP Mammals - -


ECOTOXICOLOGY

for omethoate

Property Value Source/Quality Score/Other Information Interpretation
Bio-concentration factor BCF (l kg-1) 75 Q2 Estimated Low potential
CT50 (days) Not available -
Mammals - Acute oral LD50 (mg kg-1) 50.0 F4 Rat High
Mammals - Short term dietary NOEL (mg kg-1) - B5 Rat -
(ppm diet) 0.5 -
Birds - Acute LD50 (mg kg-1) 9.9 A5 Colinus virginianus High
Birds - Short term dietary (LC50/LD50) - - -
Fish - Acute 96 hour LC50 (mg l-1) 9.1 B5 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) - - -
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 0.022 B5 Daphnia magna High
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 0.000004 P3 Unknown species High
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) - - -
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 167.5 B5 Scenedemus subspicatus Low
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees Contact acute 48 hour LD50 (μg bee-1) - - -
Oral acute 48 hour LD50 (μg bee-1) 0.048 B5 High
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) 46 B5 Eisenia andrei 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 omethoate

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) 50.0 F4 Rat High
Mammals - Dermal LD50 (mg kg-1 body weight) 145.0 L3 Rat -
Mammals - Inhalation LC50 (mg l-1) 0.3 L3 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.0003 BA5; EU 2006 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.002 BA5; EU 2006 -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) 0.0003 BA5; EU 2006 -
Dermal penetration studies (%) - - -
Dangerous Substances Directive 76/464 List I; List II - -
Exposure Limits - - -
Exposure Routes Public -
Occupational Occupational exposure may occur through inhalation and dermal contact
European MRLs Click here for the EU MRL pesticide database
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 Toxic if swallowed
May cause cyanosis

: 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 Flammable
CLP classification 2013 Health: H301, H312
Environment: H400
EC Risk Classification T - Toxic: R25
Xn - Harmful: R21
N - Dangerous for the environment: R50
EC Safety Classification S1/2, S23, S36/37, S45, S61
WHO Classification Ib - Highly hazardous
US EPA Classification (formulation) I - Danger - Highly toxic
UN Number 3018
Waste disposal & packaging -


TRANSLATIONS

for omethoate

Language Name
English omethoate
French omethoate
German Omethoat
Danish omethoate
Italian ometoato
Spanish ometoato
Greek -
Slovenian ometoat
Polish ometoat
Swedish -
Hungarian -
Dutch -

Record last updated: Saturday 19 March 2016
Contact: aeru@herts.ac.uk