Cyhalofop |
![]() Last updated: 12/01/2021 |
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(Also known as: cyhalofop acid) |
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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, Asia |
UK regulatory status |
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Not approved | ||
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Not applicable | ||
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No UK approval for use |
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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Also used in |
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Chemical structure |
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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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Unclassified | |
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Synthetic | |
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Systemic, foliar untake with no soil activity. Inhibition of acetyl CoA carboxylase (ACCase) | |
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122008-78-0 | |
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- | |
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596 | |
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Not applicable | |
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15118048 | |
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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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A | |
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1 | |
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Not applicable | |
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Not applicable | |
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Can be a metabolite of: |
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cyhalofop-butyl | Soil | 0.958 | Major fraction, Relevant |
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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1.36 | Q2 Q = Miscellaneous internet resources 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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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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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 internet resources Based on LogP < 33 = Unverified data of known source |
Low risk | |||||||
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> 5000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
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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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> 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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> 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 the butyl variant4 = Verified data |
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 (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
Low | ||||||||
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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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Xn - Harmful: R22 N - Dangerous for the environment: R50 |
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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: | 12/01/2021 |
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 |