Defenuron (Ref: IPO 4328)
Last updated: 22/01/2023
(Also known as: NSC 10989)
Defenuron is an obsolete herbicide. It is highly soluble in water and is non-volatile. It has a low toxicity to fish. It is not highly toxic to mammals if ingested.
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 obsolete herbicide that was used to control weeds in a range of crops
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Potatoes; Cereals; Maize; Vines; Fruits; Sunflowers; Peas; Vines; Forestry
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Considered obsolete but may be available in some countries
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Not approved
Not applicable
No UK approval for use
EC Regulation 1107/2009 (repealing 91/414)
Not approved
Not applicable
Not applicable
Not applicable
No
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
C₈H₁₀N₂O
CNC(=O)NC1=CC=CC=C1
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SQBHGDSDVWCPHN-UHFFFAOYSA-N
InChI=1S/C8H10N2O/c1-9-8(11)10-7-5-3-2-4-6-7/h2-6H,1H3,(H2,9,10,11)
Yes
Cambridge Crystallographic Data Centre diagrams
Common Name
Relationship
Link
defenuron
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Herbicide
Urea herbicide; Phenylurea herbicide
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Synthetic
Photosyntheis inhibition, active via leaves and roots
1007-36-9
No data found
None allocated
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13880
No data found
150.18
1-methyl-3-phenylurea
1-methyl-3-phenylurea
N-phenyl-N-methylurea
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Not known
Not known
Not applicable
Not applicable
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Colourless crystalline solid
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Obsolete - not thought to be commercially available for crop protection applications
Was usually supplied as a wettable powder
1270
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
High
7200
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Ethanol
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1000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Benzene
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3310
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Methylene chloride
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148
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
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232
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
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98.9
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
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1.32 X 1001
Calculated
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1.12
Low
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1.143
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
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1.0 X 10-02
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Low volatility
1.8 X 10-06
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Non-volatile
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Soil adsorption and mobility
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Cannot be calculated
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None
Terrestrial ecotoxicology
3440
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
Low
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172
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Poecilia reticulata
Low
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HUMAN HEALTH AND PROTECTION
High (class III)
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3440
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
Low
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EU MRL pesticide database 
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Carcinogen
Endocrine disruptor
No data found
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
; E2 E = Unspecified genotoxicity type (miscellaneous data source) 2 = Mixed/ambiguous results
No data found
Reproduction / development effects
Acetyl cholinesterase inhibitor
Neurotoxicant
No data found
XNo, known not to cause a problem
No data found
Respiratory tract irritant
Skin irritant
Skin sensitiser
No data found
No data found
No data found
Eye irritant
Phototoxicant
 
No data found
No data found
 
No further information available
No information available
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Not classified: Obsolete (Not classified: Obsolete)
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defenuron
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Record last updated:
22/01/2023
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