Imazethapyr (Ref: AC 252925) |
![]() Last updated: 11/02/2021 |
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(Also known as: CL 252925) |
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A herbicide used to control a variety of broad-leaved weeds and grasses in numerous crops | |
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Barnyardgrass, Crabgrass, Cocklebur, Pigweeds, Stinkweed Nightshade, Wild mustard, Velvetleaf, Foxtail, Morning-glory | |
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Soybeans; Peanuts; Beans and peas | |
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Current | |
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1989 |
UK regulatory status |
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Not approved | ||
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Expired | ||
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No UK approval for use |
EC Regulation 1107/2009 (repealing 91/414) |
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Not approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Expired | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Also used in |
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Australia, USA |
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Chemical structure |
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A chiral molecule existing in the R- and S-forms, the R-isomer is considered to be the most biologically active. | |
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C₁₅H₁₉N₃O₃ | |
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CCC1=CN=C(C(=C1)C(=O)O)C2=NC(C(=O)N2)(C)C(C)C | |
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No data | |
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XVOKUMIPKHGGTN-UHFFFAOYSA-N | |
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InChI=1S/C15H19N3O3/c1-5-9-6-10(13(19)20)11(16-7-9)12-17-14(21)15(4,18-12)8(2)3/h6-8H,5H2,1-4H3,(H,19,20)(H,17,18,21) | |
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Yes |
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Common Name | Relationship | Link |
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imazethapyr | - | ![]() |
General status |
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Herbicide | |
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Imidazolinone | |
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Synthetic | |
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Systemic with contact and residual activity. Inhibits plant amino acid synthesis - acetohydroxyacid synthase AHAS. | |
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81335-77-5 | |
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700 | |
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128922 | |
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54740 | |
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289.33 | |
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- | |
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5-ethyl-2-[(RS)-4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl]nicotinic acid | |
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2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl)-5-ethyl-3-pyridinecarboxylic acid | |
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- | |
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- | |
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B | |
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2 | |
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Not applicable | |
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Not applicable | |
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Many recorded cases, Amaranthus hybridus, Amaranthus lividus, Amaranthus palmeri | |
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Colourless crystals | |
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Formulations |
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Usually supplied as an aqueous concentrate |
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1400 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
High | ||||||||
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48200 | L3 L = Pesticide manuals and hard copy reference books / other sources Acetone3 = Unverified data of known source |
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105000 | L3 L = Pesticide manuals and hard copy reference books / other sources Methanol3 = Unverified data of known source |
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5000 | L3 L = Pesticide manuals and hard copy reference books / other sources Toluene3 = Unverified data of known source |
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900 | L3 L = Pesticide manuals and hard copy reference books / other sources Heptane3 = Unverified data of known source |
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171 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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Decomposes before boiling | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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180 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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3.09 X 1001 | Calculated | - | |||||||
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1.49 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
Low | ||||||||
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1.11 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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2.1 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
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pKa(2) 3.9 | |||||||||||
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1.33 X 10-02 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
Low volatility | ||||||||
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1.30 X 10-02 | Z2 Z = Kingtai Chemials website (click here ) 2 = Unverified data of unknown source |
Non-volatile | ||||||||
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Degradation |
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90 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
Moderately persistent | |||||||
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513 | B3 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 3 = Unverified data of known source |
Very persistent | ||||||||
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51 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
Moderately persistent | ||||||||
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Lab studies DT₅₀ range 126-900 days, field studies DT₅₀ range 14-290 days Northern USA and 7-19 days southern USA | ||||||||||
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15.2 | R4 R = Peer reviewed scientific publications 4 = Verified data |
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Published literature RL₅₀ range 6.5-32.1 days, 6 field crops, various matrices, n=6 | ||||||||||
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52 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
Stable | |||||||
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Stable | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
Stable | |||||||
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Soil adsorption and mobility |
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- | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) 5 = Verified data used for regulatory purposes |
Mobile | |||||||
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52 | ||||||||||
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UK PSD lab studies 20-22 mL g⁻¹ silt loam soils; Other sources: 100 mL g⁻¹ (DW3) | ||||||||||
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Fate indices |
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3.90 | Calculated | High leachability | ||||||||||||||||||||||||||
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9.67 X 10-01 | Calculated | - | |||||||||||||||||||||||||
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Medium | Calculated | - | ||||||||||||||||||||||||||
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Mobile | Calculated | - |
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1.6 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Viscera4 = Verified data |
Low potential | |||||||
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Not available | - | |||||||||
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> 5000 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) Rat5 = Verified data used for regulatory purposes |
Low | ||||||||
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818 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) Rat5 = Verified data used for regulatory purposes |
Moderate | |||||||
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10000 | - | |||||||||
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> 2150 | L3 L = Pesticide manuals and hard copy reference books / other sources Anas platyrhynchos3 = Unverified data of known source |
Low | ||||||||
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> 340 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) Oncorhynchus mykiss5 = Verified data used for regulatory purposes |
Low | ||||||||
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97.0 | P4 P = Other governments and regulators Pimephales promelas4 = Verified data |
Low | ||||||||
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> 1000 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) Daphnia magna5 = Verified data used for regulatory purposes |
Low | ||||||||
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103.0 | P3 P = Other governments and regulators Daphnia magna3 = Unverified data of known source |
Low | ||||||||
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0.008 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Lemna gibba4 = Verified data |
High | ||||||||
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71 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) Raphidocelis subcapitata5 = Verified data used for regulatory purposes |
Low | ||||||||
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> 100 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Low | |||||||
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> 24.6 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Moderate | ||||||||
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10000 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Low | ||||||||
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General |
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High (class III) | - | - | ||||||||
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> 5000 | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) Rat5 = Verified data used for regulatory purposes |
Low | ||||||||
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2000 | L3 L = Pesticide manuals and hard copy reference books / other sources Rabbit3 = Unverified data of known source |
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3.27 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
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0.44 | B4 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) UK ACP 19994 = Verified data |
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Health issues |
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No further information available |
Handling issues |
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Prevent generation of dust Corrosive |
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Environment: H400, H410 | |||
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Xn - Harmful: R21/22 Xi - Irritant: R36/38 N - Dangerous for the environment: R52 |
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U (Unlikely to present an acute hazard) | |||
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imazethapyr | ||
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imazethapyr | ||
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Imazethapyr | ||
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imazethapyr | ||
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imazetapir | ||
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imazetapir | ||
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imazetapyr | ||
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Record last updated: | 11/02/2021 |
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 |