Chloridazon (Ref: BAS 119H) |
![]() Last updated: 06/01/2021 |
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(Also known as: pyrazon; pyrazone; PAC; chloridazone) |
SUMMARY |
Choridazon is a herbicide approved fro use in the EU. It has a moderate aqueous solubility and is not considered to be volatile. It is moderately persistent in soil system and can also be persistent in water systems under some conditions. It has a low oral mammalian toxicity and whilst it is a recognised skin and eye irritant no chronic health impacts have been identified. It shows moderate to low ecotoxicity to most species. |
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A residual pyridazinone herbicide for control of weeds in beet and other crops crops | |
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Broad-leaf and grass weeds including blackgrass, canary grass and wild oats | |
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Sugarbeet; Fodder beet; Red beet; Mangels; Onions; Shallots; Garlic; Ornamentals | |
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Current | |
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1964 |
UK regulatory status |
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Not approved | ||
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Not applicable | ||
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None |
EC Regulation 1107/2009 (repealing 91/414) |
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Not approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Germany/Poland | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Not applicable | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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No | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Also used in |
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Australia |
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Chemical structure |
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Isomeric - the 4-amino-5-chloro-isomer is a common impurity | |
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C₁₀H₈ClN₃O | |
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C1=CC=C(C=C1)N2C(=O)C(=C(C=N2)N)Cl | |
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No data | |
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WYKYKTKDBLFHCY-UHFFFAOYSA-N | |
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InChI=1S/C10H8ClN3O/c11-9-8(12)6-13-14(10(9)15)7-4-2-1-3-5-7/h1-6H,12H2 | |
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Yes |
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Common Name | Relationship | Link |
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chloridazon | - | ![]() |
General status |
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Herbicide | |
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Pyridazinone | |
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920 g kg⁻¹ | |
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EU dossier - 5-chloro isomer <60 g/Kg | |
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Synthetic | |
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Selective, systemic. Inhibits photosynthesis (photosystem II). | |
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1698-60-8 | |
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216-920-2 | |
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111 | |
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069601 | |
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15546 | |
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221.6 | |
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5-amino-4-chloro-2-phenylpyridazin-3(2H)-one | |
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5-amino-4-chloro-2-phenylpyridazin-3(2H)-one | |
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5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone | |
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- | |
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- | |
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C1 | |
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5 | |
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Not applicable | |
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Not applicable | |
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- | |
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Colourless crystalline solid | |
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Formulations |
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Supplied in a variety of formulations including suspension concentrates and wettable powders |
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422 | 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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15100 | 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 ) Methanol5 = Verified data used for regulatory purposes |
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3700 | 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 ) Ethyl acetate5 = Verified data used for regulatory purposes |
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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 ) Toluene5 = Verified data used for regulatory purposes |
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190 | 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 ) Dichloromethane5 = Verified data used for regulatory purposes |
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206 | 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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Decomposes before boiling | 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 ) 3 = Unverified data of known source |
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360 | 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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Not expected to self ignite; Not highly flammable | 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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1.55 X 1001 | Calculated | - | |||||||
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1.19 | 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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1.51 | 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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3.38 | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source |
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Very weak acid | |||||||||||
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1.0 X 10-06 | 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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5.30 X 10-10 | 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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210nm = 18577, 229nm = 25043, 286nm = 10088 | 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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72.0 | 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 |
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Degradation |
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31 | K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data |
Moderately persistent | |||||||
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43.1 | 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 |
Moderately persistent | ||||||||
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18.6 | 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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78.4 | 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 |
Moderately persistent | ||||||||
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60.8 | 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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EU dossier lab studies DT₅₀ range 8.6-173.9 days (normalised), DT₉₀ range 50-140 days (normalised); field studies DT₅₀ range 3-105 days (normalised), DT₉₀ range 9-349 days (normalised); Other sources: DT₅₀ 21.0 days (DW3) | ||||||||||
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40 | 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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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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Stable at all pH for over 30 days | ||||||||||
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137 | 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 |
Slow | ||||||||
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51.5 | 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 |
Stable |
Soil adsorption and mobility |
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- | DW3 DW = Don Wauchope personal database for Pka data: Wauchope, R. D. and Edwards, J. Dissociation constants for pesticide active ingredients: a database and comparison with predicted values. MS in preparation 3 = Unverified data of known source |
Moderately mobile | |||||||
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120 | ||||||||||
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1.1 | 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 |
Moderately mobile | |||||||
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199 | ||||||||||
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0.845 | ||||||||||
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EU dossier Kf range 0.2-3.6 mL g⁻¹, Kfoc range 89-340 mL g⁻¹, 1/n range 0.568-1.03, Soils=5 | ||||||||||
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No |
Fate indices |
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2.16 | Calculated | Transition state | ||||||||||||||||||||||||||
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7.56 X 10-02 | Calculated | - | |||||||||||||||||||||||||
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Low | Calculated | - | ||||||||||||||||||||||||||
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Moderately mobile | Calculated | - |
Key metabolites |
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Soil | 0.559 | Major fraction, Relevant | |||||
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Soil | - | Minor fraction, Not relevant |
Other known metabolites |
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- | chloridazon metabolite A | Animal; Plant; Soil; Surface water | - | - | |||||
- | chloridazon metabolite B-glucoside | Plant | - | - | |||||
5-amino-4-chloro-2-methyl-3(2H)-pyridazinone Note: DT50 soil 144 days |
chloridazon metabolite B-1 | Plant | - | - | |||||
5-amino-4-chloro-2-(4-hydroxyphenyl)-3(2H)-pyridazinone | 4-OH-chloridazon; BH 119-4-OH | Animal; Rat (Urinary, Bile, Faeces) | - | - | |||||
5-amino-4-chloro-2-(4-sulfatophenyl)-3(2H)-pyridazinone | sulfate conjugate of BH 119-4-OH | Animal; Rat | - | - | |||||
5-amino-2-phenyl-3(2H)-pyridazinone | deschloro-chloridazon | Animal | - | - | |||||
5-amino-2-(4-sulfatophenyl)-3(2H)-pyridazinone | sulfate conjugate of deschloro-chloridazon | Rat | - | - | |||||
- | glucuronide of BH 119-4-OH | Rat | - | - |
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12 | P4 P = Other governments and regulators 4 = Verified data |
Low potential | |||||||
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Not available | - | |||||||||
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2140 | 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 ) Rat5 = Verified data used for regulatory purposes |
Low | ||||||||
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16 | L2 L = Pesticide manuals and hard copy reference books / other sources Rat 2 year2 = Unverified data of unknown source |
High | |||||||
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148 | 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 ) Rat Reproductive NOAEL5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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> 2000 | 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 ) Colinus virginianus5 = Verified data used for regulatory purposes |
Low | ||||||||
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> 1318 mg kg bw⁻¹ day⁻¹ | 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 ) Colinus virginianus5 = Verified data used for regulatory purposes |
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21.8 | 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 ) Colinius virginianus NOAEL5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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41.3 | 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 |
Moderate | ||||||||
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3.16 | 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 |
Moderate | ||||||||
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132.0 | 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 ) Daphnia magna5 = Verified data used for regulatory purposes |
Low | ||||||||
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6.23 | 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 |
Moderate | ||||||||
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> 3.16 | 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 ) Lemna gibba5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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> 3.0 | 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 ) Pseudokirchneriella subcapitata5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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0.73 | Q2 Q = Miscellaneous internet resources Unknown species2 = Unverified data of unknown source |
Moderate | ||||||||
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> 200 | 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 ) Apis mellifera5 = Verified data used for regulatory purposes |
Low | |||||||
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> 200 | 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 ) Apis mellifera5 = Verified data used for regulatory purposes |
Low | ||||||||
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> 1000 | 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 ) Eisenia foetida5 = Verified data used for regulatory purposes |
Low | ||||||||
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3.2 | Mortality [Dose: 0.26 Kg ha⁻¹] 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 ) Typhlodromus pyri5 = Verified data used for regulatory purposes |
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0.0 | Mortality [Dose: 2.6 Kg ha⁻¹] 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 ) Aphidius rhopalosiphi5 = Verified data used for regulatory purposes |
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Nitrogen mineralisation: No significant adverse effect Carbon mineralisation: No significant adverse effect |
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 Dose: 26 mg kg⁻¹ soil |
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General |
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High (class III) | - | - | ||||||||
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2140 | 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 ) Rat5 = Verified data used for regulatory purposes |
Low | ||||||||
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2000 | 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 ) Rat5 = Verified data used for regulatory purposes |
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> 5.4 | 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 ) Rat 4 hr5 = Verified data used for regulatory purposes |
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0.1 | 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 ) Rat SF=1005 = Verified data used for regulatory purposes |
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None allocated | 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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0.2 | 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 ) Rat SF=1005 = Verified data used for regulatory purposes |
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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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Acceptable risk for bystanders for proposed uses | |||||||||
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Acceptable risk for operators and other workers for proposed uses | ||||||||||
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Health issues |
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No further information available |
Handling issues |
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Not explosive IMDG Transport Code is usually 9 |
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Health: H317 Environment: H400, H410 |
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Xn - Harmful: R43 N - Dangerous for the environment: R50, R53 |
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S2, S24, S37, S60, S61 | |||
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III (Slightly hazardous) | |||
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Variable with product, usually 3077 or 3082 | |||
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Packaging Group III (minor danger) |
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chloridazon | ||
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chloridazone | ||
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Chloridazon | ||
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chloridazon | ||
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chloridazon | ||
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cloridazon; pirazona | ||
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- | ||
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chlorydazon | ||
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kloridazon | ||
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chloridazon | ||
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chloridazon |
Record last updated: | 06/01/2021 |
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 |