Mefenpyr (Ref: HOE 107892) |

Last updated: 02/02/2025
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(Not known by any other names) |
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 |
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A herbicide safener, nornally used as the diethyl variant, used with fenoxaprop-P-ethyl and iodosulfuron for selective weed control in cereals |
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Current |
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2011, first registered USA |
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Not approved |
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Not applicable |
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Not applicable |
EC Regulation 1107/2009 (repealing 91/414) |
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Not applicable - not a ppp. May be authorised at national level under different legislation |
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Not applicable |
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Not applicable |
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Not applicable |
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Yes |
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ATAustria |
BEBelgium |
BGBulgaria |
CYCyprus |
CZCzech Republic |
DEGermany |
DKDenmark |
EEEstonia |
ELGreece |
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ESSpain |
FIFinland |
FRFrance |
HRCroatia |
HUHungary |
IEIreland |
ITItaly |
LTLithuania |
LULuxembourg |
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LVLatvia |
MTMalta |
NLNetherlands |
PLPoland |
PTPortugal |
RORomania |
SESweden |
SISlovenia |
SKSlovakia |
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A chiral molecule. The technical material is an isomeric mixture. |
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C₁₂H₁₀Cl₂N₂O₄ |
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CC1(CC(=NN1C2=C(C=C(C=C2)Cl)Cl)C(=O)O)C(=O)O |
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No data |
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XEJNEDVTJPXRSM-UHFFFAOYSA-N |
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InChI=1S/C12H10Cl2N2O4/c1-12(11(19)20)5-8(10(17)18)15-16(12)9-3-2-6(13)4-7(9)14/h2-4H,5H2,1H3,(H,17,18)(H,19,20) |
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Yes |
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Other substance |
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Herbicide safener |
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Unclassified substance |
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- |
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- |
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Synthetic |
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Enhances the metabolism of mesosulfuron-methyl and iodosulfuron-methyl |
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135591-00-3 |
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- |
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651 |
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- |
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- |
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317.1 |
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rac-(5R)-1-(2,4-dichlorophenyl)-5-methyl-4,5-dihydro-1H-pyrazole-3,5-dicarboxylic acid |
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(RS)-1-(2,4-dichlorophenyl)-4,5-dihydro-5-methyl-1H-pyrazole-3,5-dicarboxylic acid |
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1-(2,4-dichlorophenyl)-4,5-dihydro-5-methyl-1H-pyrazole-3,5-dicarboxylic acid |
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- |
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- |
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Not applicable |
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Not applicable |
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Not applicable |
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Not applicable |
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- |
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Solid |
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As this parameter is not normally measured directly, a surrogate measure is used: ‘Photochemical oxidative DT₅₀’. Where data is available, this can be found in the Fate Indices section below. |
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Soil adsorption and mobility |
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Cannot be calculated |
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None
Terrestrial ecotoxicology |
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> 5000 |
E4 E = Manufacturers safety data sheets 4 = Verified data Rat as diethyl variant |
Low |
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- |
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HUMAN HEALTH AND PROTECTION |
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High (class III) |
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> 5000 |
E4 E = Manufacturers safety data sheets 4 = Verified data Rat as diethyl variant |
Low |
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0.1 |
UK ACP 1997 |
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0.3 |
UK ACP 1997 |
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EU MRL pesticide database |
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Carcinogen |
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Endocrine disruptor |
XNo, known not to cause a problem |
A3 A = Chromosome aberration (EFSA database) 3 = Negative ; B3 B = DNA damage/repair (EFSA database) 3 = Negative ; C3 C = Gene mutation (EFSA database) 3 = Negative ; 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 |
XNo, known not to cause a problem |
XNo, known not to cause a problem |
XNo, known not to cause a problem |
Respiratory tract irritant |
Skin irritant |
Skin sensitiser |
✓Yes, known to cause a problem |
✓Yes, known to cause a problem |
No data found |
Eye irritant |
Phototoxicant |
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✓Yes, known to cause a problem |
No data found |
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No further information available |
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No information available |
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Environment: H411 |
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Not listed (Not listed) |
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UN3077 |
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Packaging Group III (minor danger) |
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- |
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mefenpyr |
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mefenpyr |
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Mefenpyr |
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mefenpyr |
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mefenpir |
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mefenpir |
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- |
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mefenpyr |
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- |
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mefenpyr |
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- |
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- |
Record last updated: |
02/02/2025 |
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 |