Imazapyr |
![]() Last updated: 11/02/2021 |
![]() |
(Also known as: imazapyr acid) |
|
![]() |
|
A herbicide for non-crop land applications which is particularly effective on hard-to-control perennial grasses | |
---|---|---|
|
Annual and perennial grasses, Broad-leaved weeds; Woody plants; Brambles; Brush | |
|
Forestry; Wetland sites; Non-cropped areas | |
|
- | |
|
Current | |
|
1985 |
UK regulatory status |
|
Not approved | ||
---|---|---|---|
|
Expired | ||
|
No UK approval for use |
EC Regulation 1107/2009 (repealing 91/414) |
|
Not approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
- | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Expired | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
- | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
Also used in |
|
Australia, USA |
---|
Chemical structure |
|
A chiral molecule existing in the S- and R-forms | |
---|---|---|
|
C₁₃H₁₅N₃O₃ | |
|
CC(C)C1(C(=O)NC(=N1)C2=C(C=CC=N2)C(=O)O)C | |
|
No data | |
|
CLQMBPJKHLGMQK-UHFFFAOYSA-N | |
|
InChI=1S/C13H15N3O3/c1-7(2)13(3)12(19)15-10(16-13)9-8(11(17)18)5-4-6-14-9/h4-7H,1-3H3,(H,17,18)(H,15,16,19) | |
|
Yes |
General status |
|
Herbicide | |
---|---|---|
|
Imidazolinone | |
|
- | |
|
- | |
|
Synthetic | |
|
Non-selective, absorbed by foliage and rapidly translocated. Controls vegetation by interfering with an enzyme pathway. Inhibits plant amino acid synthesis - acetohydroxyacid synthase AHAS. | |
|
81334-34-1 | |
|
- | |
|
530 | |
|
128821 | |
|
54738 | |
|
261.28 | |
|
- | |
|
2-[(RS)-4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl]nicotinic acid | |
|
2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl)-3-pyridinecarboxylic acid | |
|
- | |
|
- | |
|
B | |
|
2 | |
|
Not applicable | |
|
Not applicable | |
|
Lolium rigidum | |
|
Off-white to tan coloured solid |
Formulations |
|
|
|||
---|---|---|---|---|
|
|
|||
|
|
|||
|
Usually supplied as an aqueous solution that contains a wetting agent |
|
![]() |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
9740 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
High | ||||||||
|
33900 | L3 L = Pesticide manuals and hard copy reference books / other sources Acetone3 = Unverified data of known source |
- | ||||||||
9.5 | L3 L = Pesticide manuals and hard copy reference books / other sources Hexane3 = Unverified data of known source |
- | |||||||||
105000 | L3 L = Pesticide manuals and hard copy reference books / other sources Methanol3 = Unverified data of known source |
- | |||||||||
1800 | L3 L = Pesticide manuals and hard copy reference books / other sources Toluene3 = Unverified data of known source |
- | |||||||||
|
171 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
- | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
|
1.29 X 1000 | Calculated | - | |||||||
|
0.11 | H4 H = The US ARS pesticide properties database (click here ) 4 = Verified data |
Low | ||||||||
|
1.34 | Q2 Q = Miscellaneous internet resources 2 = Unverified data of unknown source |
- | ||||||||
|
1.9 | DW4 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 4 = Verified data |
- | ||||||||
pKa(2) 3.6, pKa(3) 11.0 | |||||||||||
|
0.013 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Low volatility | ||||||||
|
3.00 X 10-07 | H4 H = The US ARS pesticide properties database (click here ) 4 = Verified data |
Non-volatile | ||||||||
|
- | - | - | ||||||||
|
- | - | - |
Degradation |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
- | ||||||||||
|
|
11 | 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 | |||||||
|
11 | 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 | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
EU dossier lab studies DT₅₀ range 5.9-16.5 days; Other sources: DT₅₀ 90 days (DW4), 25-142 (F3) | ||||||||||
|
|
- | - | - | |||||||
|
- | ||||||||||
|
|
26.0 | R3 R = Peer reviewed scientific publications 3 = Unverified data of known source |
- | |||||||
|
Forest plant leaves, n=1 | ||||||||||
|
|
2.1 | K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data |
Moderately fast | |||||||
|
- | ||||||||||
|
|
30 | K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data |
Moderately persistent | |||||||
|
- | ||||||||||
|
- | - | - | ||||||||
|
- | - | - |
Soil adsorption and mobility |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
|
- | - | - | |||||||
|
- | ||||||||||
|
- | ||||||||||
|
|
1.23 | 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 ) 5 = Verified data used for regulatory purposes |
Moderately mobile | |||||||
|
125 | ||||||||||
|
0.94 | ||||||||||
|
EU dossier Kf range 0.64-1.81; 1/n range 0.90-0.97; Other literature data Kf range 0.84-33,24 mL g⁻¹, Kfoc range 17.9-3022 mL.g, 1.n range 0.50-0.81, Soils=6 (R4) | ||||||||||
|
- |
Fate indices |
|
|
|
|
||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
1.98 | Calculated | Transition state | ||||||||||||||||||||||||||
|
|
4.02 X 10-02 | Calculated | - | |||||||||||||||||||||||||
|
- | ||||||||||||||||||||||||||||
|
Low | Calculated | - | ||||||||||||||||||||||||||
|
Moderately mobile | Calculated | - |
|
![]() |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
|
2.54 | Q2 Q = Miscellaneous internet resources Estimated2 = Unverified data of unknown source |
Low potential | |||||||
|
Not available | - | |||||||||
|
> 2000 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
Low | ||||||||
|
|
- | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
- | |||||||
|
10000 | - | |||||||||
|
- | - | - | ||||||||
|
2150 | L3 L = Pesticide manuals and hard copy reference books / other sources Anas platyrhynchos3 = Unverified data of known source |
Low | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
> 100 | L3 L = Pesticide manuals and hard copy reference books / other sources Oncorhynchus mykiss3 = Unverified data of known source |
Low | ||||||||
|
43.1 | P4 P = Other governments and regulators Oncorhynchus mykiss 28 day4 = Verified data |
Low | ||||||||
|
> 100 | L3 L = Pesticide manuals and hard copy reference books / other sources Daphnia magna3 = Unverified data of known source |
Low | ||||||||
|
> 97.1 | P3 P = Other governments and regulators Daphnia magna3 = Unverified data of known source |
Low | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
0.024 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Lemna gibba3 = Unverified data of known source |
Moderate | ||||||||
|
- | - | - | ||||||||
- | - | - | |||||||||
|
71 | W2 W = French database provided by ARVALIS-Institut du Végétal Unknown species2 = Unverified data of unknown source |
Low | ||||||||
|
- | - | - | ||||||||
|
|
> 100 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Apis mellifera4 = Verified data |
Low | |||||||
|
25 | K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data |
Moderate | ||||||||
|
- | - | - | ||||||||
|
|
- | - | - | |||||||
- | |||||||||||
|
- | - | - | ||||||||
- | |||||||||||
|
|
- | - | - | |||||||
|
- | - | - | ||||||||
|
|
- | - | - | |||||||
|
- | ||||||||||
|
|
- | - | - | |||||||
|
- | ||||||||||
|
133 | K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data |
Moderate | ||||||||
|
- | - | - | ||||||||
|
|
- | - | - | |||||||
|
- | - | - | ||||||||
|
|
- | - | - |
|
- | - | - | |||
|
|
- | - | - |
|
- | - | - | |||
|
- | - | - | ||||||||
|
|
- | - | - |
|
- | - | - |
|
![]() |
General |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
High (class III) | - | - | ||||||||
|
> 2000 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
Low | ||||||||
|
2000 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
- | ||||||||
|
5.1 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
- | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
|
- | |||||||||
|
- | ||||||||||
|
|
|
|||||||||
|
- | ||||||||||
|
- | - | - | ||||||||
|
- | - | - |
Health issues |
|
|
||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Highly toxic |
Handling issues |
|
|
|||
---|---|---|---|---|
|
Prevent generation of mists | |||
|
Health: H319 Environment: H412 |
|||
|
Xi - Irritant: R36 N - Dangerous for the environment: R52, R53 |
|||
|
S2, S26, S61 | |||
|
U (Unlikely to present an acute hazard) | |||
|
- | |||
|
- |
|
![]() |
|
|
||
---|---|---|---|
|
imazapyr | ||
|
imazapyr | ||
|
Imazapyr | ||
|
imazapyr | ||
|
imazapir | ||
|
imazapir | ||
|
imazapyr | ||
|
imazapyr | ||
|
imazapyr | ||
|
- | ||
|
imazapyr |
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 |