Methomyl (Ref: OMS 1196) |
![]() Last updated: 12/01/2021 |
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(Also known as: DPX X1179) |
SUMMARY |
Methomyl is an oxime carbamate insecticide no longer approved for use in the EU. It is highly soluble in water but has a low volatility and would not normally be expected to leach to groundwater. It is not normally persistent in soil or water systems. It is highly toxic to mammals and a cholinesterase inhibitor. It shows a moderate to high toxicity to most fauna and flora. |
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An insecticide used to control a wide range of foliar and soil-borne insects. Also a pesticide transformation product | |
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Lepidoptera, Coleoptera and Diptera | |
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Lettuce; Artichokes; Rhubarb; Orchard crops; Sod turf; Alfalfa; Sugarbeet; Cotton | |
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- | |
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Current | |
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First registered in the United States in 1968 |
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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Belgium/Romania | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Expired | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes - low ADI / ARfD / AOEL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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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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Isomeric - cis-isomer is strongly favored thermodynamically | |
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C₅H₁₀N₂O₂S | |
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CC(=NOC(=O)NC)SC | |
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C/C(=N\OC(=O)NC)/SC | |
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UHXUZOCRWCRNSJ-UHFFFAOYSA-N | |
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InChI=1S/C5H10N2O2S/c1-4(10-3)7-9-5(8)6-2/h1-3H3,(H,6,8)/b7-4+ | |
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Yes |
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Common Name | Relationship | Link |
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methomyl | Unstated isomer | ![]() |
(E)-methomyl | (E)-isomer | ![]() |
(Z)-methomyl | (Z)-isomer | ![]() |
General status |
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Insecticide, Acaricide, Metabolite | |
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Soil, Animal, Water, Plant | |
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Carbamate | |
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980 g kg⁻¹ | |
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EU dossier - None declared | |
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Synthetic | |
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Systemic with contact and stomach action. Cholinesterase inhibitor. | |
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16752-77-5 | |
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240-815-0 | |
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264 | |
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090301 | |
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5353758 | |
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162.21 | |
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- | |
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S-methyl (EZ)-N-(methylcarbamoyloxy)thioacetimidate | |
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methyl N-(((methylamino)carbonyl)oxy)ethanimidothioate | |
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Marine Pollutant; Chemical subject to PIC regulations | |
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- | |
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Not applicable | |
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Not applicable | |
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1A | |
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Not applicable | |
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Aphis gossypii, Bemisia tabaci, Chrysoperla carnea, Earias vittella, Frankliniella occidentalis, Heliothis assulta, many more | |
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White crystalline solid |
Can be a metabolite of: |
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thiodicarb | Soil | 0.800 | Major fraction, Relevant | |||||
alanycarb | Soil | - | - |
Formulations |
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Often supplied as a soluble concentrate or emulsifiable concentrate. May be applied aerially in the US. |
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55000 | 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 |
High | ||||||||
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97100 | 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 ) n-Heptane5 = Verified data used for regulatory purposes |
- | ||||||||
250000 | 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 ) Acetone5 = Verified data used for regulatory purposes |
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1000000 | L3 L = Pesticide manuals and hard copy reference books / other sources Methanol3 = Unverified data of known source |
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420000 | L3 L = Pesticide manuals and hard copy reference books / other sources Ethanol3 = Unverified data of known source |
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79.6 | 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 |
- | ||||||||
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Decomposes before boiling | 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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192 | 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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1.23 X 1000 | Calculated | - | |||||||
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0.09 | 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 |
Low | ||||||||
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1.32 | 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 applicable | 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 |
- | ||||||||
No dissociation | |||||||||||
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0.72 | 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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2.13 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 |
Non-volatile | ||||||||
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Neutral solution: 234nm = 9010 Acidic solution: 234nm = 8980 Basic solution: 234nm = 8890 |
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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73.7 | 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 ) at 20.1°C5 = Verified data used for regulatory purposes |
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Degradation |
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7 | 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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6.97 | 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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- | - | - | ||||||||
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25.3 | 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 ) 5 = Verified data used for regulatory purposes |
Non-persistent | ||||||||
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EU dossier lab studies DT₅₀ range 4.6-8.6 days, DT₉₀ range 15.4-38.2 days; Other sources: DT₅₀ 30 days (DW4) | ||||||||||
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3.0 | R4 R = Peer reviewed scientific publications 4 = Verified data |
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Published literature RL₅₀ range 0.5-8.7 days, 8 field & undercover grown crops, various matrices, n=14 | ||||||||||
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4.0 | R4 R = Peer reviewed scientific publications 4 = Verified data |
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Published literature RL₅₀ range 0.9-6.4 days, 13 field & undercover grown crops, various matrices, n=14 | ||||||||||
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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 | 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 pH 5 to pH 7, DT₅₀ 36 days at pH 9, all at 25 °C | ||||||||||
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3.7 | 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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2.9 | 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 |
Moderately fast |
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 |
Mobile | |||||||
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72 | ||||||||||
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- | ||||||||||
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0.381 | 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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25.2 | ||||||||||
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0.86 | ||||||||||
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EU dossier Kf range 0.145-0.809 mL g⁻¹, Kfoc range 13.3-42.8 mL g⁻¹, 1/n range 0.82-0.89, Soils=5 | ||||||||||
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No |
Fate indices |
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2.19 | Calculated | Transition state | ||||||||||||||||||||||||||
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1.45 X 10-02 | Calculated | - | |||||||||||||||||||||||||
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Low | Calculated | - | ||||||||||||||||||||||||||
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Mobile | Calculated | - |
Key metabolites |
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Soil | 0.022 | Minor fraction, Not relevant |
Other known metabolites |
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acetonitrile | - | Water/sediment; Soil; Rat (Blood, Liver) | - | - | |||||
acetamide | - | Animal; Rat | - | - | |||||
E-methyl N-[[(methylamino)carbonyl]oxy]ethanimidothioate (Ref: IN-B1884) | anti-methomyl | Animal | - | - | |||||
9-hydroxy-6-methyl-3-oxo-4-oxa-7-thia-2,5-diazadec-5-en-10-oic acid (Ref: IN-HUZ57) | hydroxy cysteine of methomyl | Plant | - | - | |||||
methyl-N-[[[(hydroxymethyl)amino]carbonyl]oxy]ethanimidothioate (Ref: IN-G6520) | hydroxy methyl methomyl | Plant | - | - | |||||
N-acetyl-S-[1-[[[(methylamino)carbonyl]oxy]imino]ethyl]-L-cysteine | methomyl mercapturate | Rat (Urinary) | - | - | |||||
2-methyl-4-thiazolemethanol (Ref: IN-NR282) | - | Plant | - | - |
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Low risk | 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 ) Based on LogP < 35 = Verified data used for regulatory purposes |
Low risk | |||||||
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- | - | |||||||||
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30 | 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 |
High | ||||||||
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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 ) Rabbit5 = Verified data used for regulatory purposes |
High | |||||||
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- | - | |||||||||
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- | - | - | ||||||||
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24.2 | 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 ) Colinus virginianus5 = Verified data used for regulatory purposes |
High | ||||||||
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> 518.8 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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- | - | - | ||||||||
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0.63 | 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 ) Lepomis macrochirus5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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0.076 | 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 ) Lepomis macrochirus5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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0.0076 | J4 J = Pesticide Action Network database (click here ) Daphnia magna4 = Verified data |
High | ||||||||
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0.0016 | 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 |
High | ||||||||
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0.036 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Americamysis bahia3 = Unverified data of known source |
High | ||||||||
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0.032 | 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 ) Chironomus riparius5 = Verified data used for regulatory purposes |
High | ||||||||
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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 ) Selenastrum capricornutum5 = Verified data used for regulatory purposes |
Low | ||||||||
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0.16 | 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 ) Apis mellifera5 = Verified data used for regulatory purposes |
High | |||||||
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0.28 | 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 |
High | ||||||||
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> 3.3 | R4 R = Peer reviewed scientific publications Bombus terrestris4 = Verified data |
Moderate | ||||||||
Literature DT₅₀ values range 0.44-3.46 µg bee⁻¹ | |||||||||||
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0.14 | R4 R = Peer reviewed scientific publications Trigona spinipes4 = Verified data |
High | |||||||
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Oral | ||||||||||
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0.05 | R4 R = Peer reviewed scientific publications Nannotrigona perilampoides4 = Verified data |
High | |||||||
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Oral | ||||||||||
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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 ) Eisenia foetida5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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1.5 | 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 ) Eisenia foetida5 = Verified data used for regulatory purposes |
Moderate | ||||||||
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0.20 | 48 hour 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 rhopalosiphi adult5 = Verified data used for regulatory purposes |
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9.1 | 7 day 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 pyri protonymph5 = Verified data used for regulatory purposes |
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- | - | - | |||
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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: 4.5 kg ha⁻¹ 28 days |
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General |
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High (class III) | - | - | ||||||||
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30 | 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 |
High | ||||||||
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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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0.215 | 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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- | - | - | ||||||||
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0.0025 | 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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0.0025 | 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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0.0025 | 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 ) Rat SF=1003 = Unverified data of known source |
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1.2-15.0 | 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 ) concentration dependent5 = Verified data used for regulatory purposes |
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No unacceptable risks to bystanders identified | |||||||||
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Risk of expsoure via dermal absortption Risk of exposure acceptable under label recommendations for use for personal protection clothing and equipment |
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Health issues |
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Possible thyroid toxicant Endocrine issues - Weak increase of aromatase activity and estrogen production |
Handling issues |
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Not explosive or oxidising IMDG Transport Code is usually 6.1 |
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Health: H300 Environment: H400, H410 |
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T+ - Very toxic: R28 N - Dangerous for the environment: R50, R53 |
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S1/2, S22, S36/37, S45, S60, S61 | |||
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Ib (Highly hazardous / Highly hazardous) | |||
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2757 | |||
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Packaging Group II (medium danger) |
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methomyl | ||
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methomyl | ||
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Methomyl | ||
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methomyl | ||
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metomil | ||
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metomilo | ||
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methomyl | ||
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metomyl | ||
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metomyl | ||
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metomil | ||
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methomyl |
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 |