Cyhalofop |
Last updated: 24/07/2024 |
(Also known as: cyhalofop acid) |
SUMMARY |
Cyhalofop is a post-emergence herbicide, used mainly for rice as the butyl variant. It is moderately soluble in water and non-volatile. It is not expected to be persistent in the environment. The risk of leaching to groundwater is low. It is moderately toxic to honeybees. It hs a low mammalian oral toxicity. |
Data alerts |
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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Warning: Significant data are missing |
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A herbicide used for post-emergence control of grass weeds usually in rice crops that is normally used as the butyl variant. It is also a pesticide transformation product | |
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Barnyardgrass; Silvertop; Flatsedge; Junglerice; Pigweed; Cocklebur | |
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Rice | |
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Current | |
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circa 1990, introduced Asia |
UK regulatory status |
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Approved | ||
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30/06/2032 | ||
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No data |
EC Regulation 1107/2009 (repealing 91/414) |
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Approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Italy/Austria | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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30/06/2032 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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No | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Additional information |
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Chemical structure |
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Absolute stereochemistry with 1 defined stereocenter | |
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C₁₆H₁₂FNO₄ | |
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CC(C(=O)O)OC1=CC=C(C=C1)OC2=C(C=C(C=C2)C#N)F | |
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C[C@H](C(=O)O)OC1=CC=C(C=C1)OC2=C(C=C(C=C2)C#N)F | |
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ROBSGBGTWRRYSK-SNVBAGLBSA-N | |
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InChI=1S/C20H20FNO4/c1-3-4-11-24-20(23)14(2)25-16-6-8-17(9-7-16)26-19-10-5-15(13-22)12-18(19)21/h5-10,12,14H,3-4,11H2,1-2H3 | |
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Yes |
General status |
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Herbicide, Metabolite | |
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Soil | |
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Arylphenoxypropionic herbicide | |
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- | |
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- | |
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Synthetic | |
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Systemic, foliar untake with no soil activity. Acetyl CoA carboxylase inhibitor (ACCase) - distrupts fatty acid biosynthesis and lipid formation. | |
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122008-78-0 | |
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808-439-7 | |
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596 | |
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Not applicable | |
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15118048 | |
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No data found | |
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357.38 | |
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(2R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy]propanoic acid | |
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(R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy]propionic acid | |
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(2R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy]propanoic acid | |
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- | |
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- | |
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A | |
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1 | |
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Not applicable | |
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Not applicable | |
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- | |
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Can be a metabolite of: |
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cyhalofop-butyl | Soil | 0.958 | Major fraction |
Formulations |
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Usually formulated as the butyl variant. |
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180 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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16000 | A3 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Xylene (1.6%w/w)3 = Unverified data of known source |
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1600000 | A3 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Methanol (157.6% w/w)3 = Unverified data of known source |
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216000 | A3 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Chloroform (21.6% w/w)3 = Unverified data of known source |
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280000 | A3 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Toluene (2.8% w/w)3 = Unverified data of known source |
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3.24 X 10-01 | Calculated | - | |||||||
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-0.49 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Low | ||||||||
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Not relevant | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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Regulatory data - negligible residues seen in animal studies | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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1.36 | Q2 Q = Miscellaneous data from online sources 2 = Unverified data of unknown source |
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3.9 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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2.0 X 10-03 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Low volatility | ||||||||
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2.41 X 10-09 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Non-volatile | ||||||||
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Purified water: 235nm=15900; 248nm = 15200; 274nm=7511; 282nm=6030 0.1M HCl: 234nm=14900; 249nm=15800; 273nm=7880; 281nm=5960 0.1M NaOH: 236nm=16300; 248nm=15700; 273nm=8320; 281nm=6740 |
A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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Degradation |
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0.71 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Non-persistent | |||||||
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0.71 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Non-persistent | ||||||||
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15.0 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Non-persistent | ||||||||
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EU dossier lab studies DT₅₀ range 0.36-1.6 days, DT₉₀ range 1.2-5.3 days | ||||||||||
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Stable | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Stable | |||||||
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5.5 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Fast | ||||||||
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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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1.68 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 4 = Verified data |
Moderately mobile | |||||||
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186 | ||||||||||
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EU dossier Kd range 1.41-1.95 mL g⁻¹, Koc range 176-195 mL g⁻¹, Soils=2 | ||||||||||
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1.22 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Mobile | |||||||
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24.0 | ||||||||||
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0.822 | ||||||||||
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EU dossier Kf range 0.373-4.03 mL g⁻¹, Kfoc range 14.4-37.3 mL g⁻¹, 1/n range 0.775-0.862, Soils=5 | ||||||||||
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None |
Fate indices |
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-0.39 | Calculated | Low leachability | ||||||||||||||||||||||||||
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7.63 X 10-04 | Calculated | - | |||||||||||||||||||||||||
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Low | Calculated | - | ||||||||||||||||||||||||||
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Moderately mobile | Calculated | - | ||||||||||||||||||||||||||
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Low risk | Q3 Q = Miscellaneous data from online sources Based on LogP < 33 = Unverified data of known source |
Low risk | |||||||||||||||||||||||||
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No data | - |
Known metabolites |
None
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Terrestrial ecotoxicology |
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> 5000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
Low | ||||||||
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> 1000 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Eisenia foetida as butyl variant4 = Verified data |
Low | ||||||||
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> 40 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) as the butyl variant4 = Verified data |
Moderate | ||||||||
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Aquatic ecotoxicology |
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> 100 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Oncorhynchus mykiss5 = Verified data used for regulatory purposes |
Low | ||||||||
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> 100 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Daphnia magna5 = Verified data used for regulatory purposes |
Low | ||||||||
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> 78.2 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Pseudokirchneriella subcapitata5 = Verified data used for regulatory purposes |
Low | ||||||||
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General |
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High (class III) | - | - | ||||||||
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> 5000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
Low | ||||||||
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0.003 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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0.4 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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0.013 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
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Health issues |
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No further information available |
Handling issues |
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No information available | |||
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Health: H302 Environment: H400 |
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U (Unlikely to present an acute hazard) | |||
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cyhalofop | ||
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cyhalofop | ||
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Cyhalofop | ||
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cyhalofop | ||
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cyhalofop | ||
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cihalofop | ||
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cyhalofop | ||
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Record last updated: | 24/07/2024 |
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 |