Methidathion (Ref: ENT 27193 )
Last updated: 15/02/2023
(Also known as: OMS 844)
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
An insecticide and acaricide used to control a wide range of chewing and sucking pests
Scales; Spider mites; Bollworm; Budworm; Lygus bugs; Whitefly
Sunflower; Artichokes; Apples; Almonds; Cherries; Citrus; Sorghum; Cotton; Alfalfa
-
Current
circa 1968
Not approved
Expired
No UK approval for use
EC Regulation 1107/2009 (repealing 91/414)
Not approved
Portugal
Expired
-
Yes
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
 
 
 
 
 
 
 
 
 
ISIceland
NONorway
 
 
 
 
 
 
 
 
 
None
C₆H₁₁N₂O₄PS₃
COC1=NN(C(=O)S1)CSP(=S)(OC)OC
No data
MEBQXILRKZHVCX-UHFFFAOYSA-N
InChI=1S/C6H11N2O4PS3/c1-10-5-7-8(6(9)16-5)4-15-13(14,11-2)12-3/h4H2,1-3H3
Yes
Cambridge Crystallographic Data Centre diagrams
Common Name
Relationship
Link
methidathion
-
Insecticide, Acaricide
Organophosphate insecticide; Organothiophosphate inseticide; Organophosphate acaricide; Organothiophosphate acaricide
-
-
Synthetic
Non-systemic with contact and stomach action. Cholinesterase inhibitor.
950-37-8
213-449-4
193
100301
13709
015-069-00-2
302.3
-
3-dimethoxyphosphinothioylthiomethyl-5-methoxy-1,3,4-thiadiazol-2(3H)-one
S-((5-methoxy-2-oxo-1,3,4-thiadiazol-3(2H)-yl)methyl) O,O-dimethyl phosphorodithioate
Marine Pollutant; Chemical subject to PIC regulations; Subject to the provisions of the UK Poisons Act 1972
-
Not applicable
Not applicable
1B
Not applicable
Aedes nigromaculis , Aphis gossypii , Bemisia tabaci , Meligethes aeneus , Myzus persicae , Plutella xylostella , many more
Colourless crystals
King Tech Corp Makhteshim Agan Syngenta Ciba Geigy
Cobra Cobracide Suprathion Supracide Ultracid Ultracide
Usually supplied as an emulsifiable concentrate or wettable powder
240
Moderate
150000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Ethanol
-
670000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Acetone
-
11000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Hexane
-
14000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
n-Octanol
-
39.5
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
-
-
-
-
-
-
-
-
-
3.72 X 1002
Calculated
-
2.57
Low
-
-
-
-
-
-
1.51
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
-
-
-
-
0.25
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Low volatility
3.30 X 10-04
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Non-volatile
-
-
-
-
-
-
-
10
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Non-persistent
10
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Non-persistent
7
Non-persistent
-
-
-
-
-
-
-
-
-
Lab and field studies DT₅₀ range 3-18 days
5.0
R4 R = Peer reviewed scientific publications 4 = Verified data
-
Published literature RL₅₀ range 0.45-11.36 days, 6 field & undercover grown crops, various matrices, n=7
6.5
R4 R = Peer reviewed scientific publications 4 = Verified data
-
Published literature RL₅₀ range 1.5-12.6 days, 3 field & undercover grown crops, various matrices, n=5; Grapes in cold storage RL₅₀=64 days.
14
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Slow
-
27
Non-persistent
-
70
Moderately fast
6
Moderately fast
Soil adsorption and mobility
-
Moderately mobile
400
-
-
-
-
-
-
-
-
1.18
Calculated
Low leachability
9.23 X 10-03
Calculated
-
-
Low
Calculated
-
Moderately mobile
Calculated
-
12.6
R3 R = Peer reviewed scientific publications 3 = Unverified data of known source
Low potential
Not available
-
None
Terrestrial ecotoxicology
25
Rat
High
0.2
L2 L = Pesticide manuals and hard copy reference books / other sources 2 = Unverified data of unknown source
Rat 2 year
High
4
-
-
-
-
23.6
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Anas platyrhynchos
High
-
-
-
-
-
-
5.6
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Eisenia foetida
High
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
> 0.13
Apis mellifera
High
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Harmful
AA2 AA = IOBC Database on classification of side effects to beneficial organisms, 2005 2 = Unverified data of unknown source
Chrysoperla carnea
-
-
-
-
Harmful
AA2 AA = IOBC Database on classification of side effects to beneficial organisms, 2005 2 = Unverified data of unknown source
Typhlodromus pyri
-
-
-
-
0.01
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Oncorhynchus mykiss
High
-
-
-
0.0064
Daphnia magna
High
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
> 22
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Scenedemus subspicatus
Low
> 0.2
P3 P = Other non-EU, UK or US Governments and Regulators 3 = Unverified data of known source
Chlorella pyrenoidosa
Moderate
-
-
-
-
-
-
HUMAN HEALTH AND PROTECTION
High (class III)
-
-
25
Rat
High
200
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rabbit
-
0.14
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
-
-
-
-
0.001
JMPR 1997
-
0.01
UK ACP 1999
-
-
-
-
-
-
-
-
-
-
List I; List II
-
-
-
May be absorbed through the skin
EU MRL pesticide database 
-
-
-
-
-
-
-
-
-
-
Carcinogen
Endocrine disruptor
?Possibly, status not identified
A3 A = Chromosome aberration (EFSA database) 3 = Negative
; 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
; E3 E = Unspecified genotoxicity type (miscellaneous data source) 3 = Negative
No data found
Reproduction / development effects
Acetyl cholinesterase inhibitor
Neurotoxicant
?Possibly, status not identified
✓Yes, known to cause a problem
✓Yes, known to cause a problem
Respiratory tract irritant
Skin irritant
Skin sensitiser
XNo, known not to cause a problem
✓Yes, known to cause a problem
No data found
Eye irritant
Phototoxicant
 
XNo, known not to cause a problem
No data found
 
Possible nervous system, liver, gall bladder and ovaries toxicant USEPA - possible human carcinogen
IMDG Transport Code is 6.1
Health: H300, H302 Environment: H400, H410
Ib (Highly hazardous)
2783
-
methidathion
methidathion
Methidathion
methidathion
metidation
metidation
methidathion
metydation
-
-
methidathion
-
Record last updated:
15/02/2023
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