other name:(?-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid
CAS No.: [ 81335-77-5 ]
Molecular Formula: C15H19N3O3
Imazethapyr is an imidazole compound used as a selective herbicide. It is applied preplant incorporated, preemergence, at cracking, and postemergence. The compound controls weeds by reducing the levels of three branched-chain aliphatic amino acids, isoleucine, leucine and valine, through the inhibition of aceto-hydroxyacid synthase, an enzyme common to the biosynthetic pathway for these amino acids. This inhibition causes a disruption in protein synthesis which, in turn, leads to an interference in DNA synthesis and cell growth. The compound is used to control grasses and broadleaved weeds including barnyardgrass, crabgrass, cocklebur, panicums, pigweeds, nightshade, mustard, smartweed, velvetleaf, jimsonweed, foxtails, seedling johnsongrass, lambsquarters, morningglory and others. Tolerant crops include soybeans, peanuts, dry and edible beans, peas, alfalfa and imidazolinone resistant/tolerant corn. Additional research is being conducted on other leguminous crops
Branched chain amino acid synthesis (ALS or AHAS) inhibitor. Hence reduces levels of valine, leucine and isoleucine, leading to disruption of protein and DNA synthesis. Selectivity in soya benas and peanuts is attributed to rapid detoxification via hydroxylation and glycosylation (B. Tecle et al., Proc. 1997 Br. Crop Prot. Conf. - Weeds, 2,605).
Mode of action
Systemic herbicide, absorbed by the roots and foliage, with translocation in the xylem and phloem, and accumulation in the meristematic regions.
Control of many major annual and perennial grass and broad-leaved weeds in most major crops, at 2-4 oz/a. Applied pre-plant incorporated, pre-emergence, or post-emergence.
Non-phytotoxic to soya beans and other leguminous crops, when used as directed.
Formulation types Aqueous solution; WG.
|Appearance||Pale yellow crystalline solid|
|Loss on drying||0.5% max.|
|Insoluble matter in NaOH Solution (40g/L)||0.1% max.|
GHS complaint Safety Data Sheet (SDS) for commercial product of Imazethapyr is available uopn requested.