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- Imazethapyr is a selective systemic
herbicide. It is registered for preplant, pre-emergence or postemergence
use on terrestrial food and/or feed crops.
- Imazethapyr is a highly efficient
herbicide, In 1987, imazethapyr was launched for the control of
broad-leaved weeds and grasses, mainly in soybeans.
- Imazethapyr, a heterocyclic aromatic
amine, is a widely used crop herbicide first registered for use in the
United States in
- Imazethapyr may be used alone or in
co-formulation with imazamox or pendimethalin to control a broad
spectrum of broadleaf and grassy weeds. It is applied once per year at a
rate of 10 to 100
g a.e./ha by ground equipment only.
- Imazethapyr has also been widely used
in soybeans, field peas and processing peas. It is the only herbicide
registered for the control of broadleaf weeds in chickling vetch and
- Imazethapyr is the only alternative
for the control of grassy weeds in chickling vetch and fenugreek.
Imazethapyr controls both grassy and broadleaf weeds in adzuki beans,
lima beans, snap common beans and dry common beans while alternatives
only control either grassy or broadleaf weeds.
acid] belongs to a class of chemicals known as imidazolinones.
- Apperance -
Technical imazethapyr is an off-white to tan solid with a slightly
pungent odor. The formulated product is a clear dark brown liquid
with a musty odor.
- The vapour
pressure of imazethapyr determined by the gas saturation method was
than 1 x 10-7 mm Hg (torr) (1.3 x 10-5 Pa) at 60oC. This vapour
pressure indicated that
the herbicide would not be volatile if applied to soil or plant surfaces.
- The water
solubility of imazethapyr was high (1415 mg/L in distilled water and
mg/L in water buffered at pH 3.9, both at 25/C). Considering the
very high water
solubility and the low vapour pressure of this herbicide, Henry’s
Law Constant (air/water
distribution ratio) was calculated to be 2.7 x 10-11 atm.m3 mol-1
indicating a high potential
for the chemical to remain in water rather than volatilize into the
is a general use pesticide with a toxicity classification of III
- Acute overexposures to imazethapyr resulted in low toxicity
by the oral, dermal and inhalation routes, results showed that
contact with the eye may cause mild eye irritation.
- Imazethapyr presents negligible risk to wild birds, mammals,
bees, earthworms, fish, amphibians, aquatic invertebrates and
algae because concentrations in the environments are expected to
be at levels that are not harmful.
- For bladder cancer,
participants in the highest exposure category of imazethapyr had
a 137% higher risk than nonexposed pesticide applicators. For
colon cancer, detailed analysis by subsite revealed that
imazethapyr use was significantly associated with a 173%
increased risk of proximal cancers, but not with distal or
- Oral Acute oral LD50 for male
and female rats, and female mice >5000 mg/kg. Skin and eye Acute
percutaneous LD50 for rabbits >2000 mg/kg; Mild skin and
reversible eye irritant. Inhalation LC50 for rats 3.27 mg/l air
(analytical), 4.21 mg/l (gravimetric). NOEL (2 y) for rats >10
000 mg/kg diet; (1 y) for dogs >10 000 mg/kg diet (highest dose
Imazethapyr, an imidazolinone herbicide similar to imazaquin
in chemical structure and weed control properties,
received federal registration for use in the spring of 1989.
Imazethapyr residue persistence, reported in a Canadian
study on soils of pH ranging from 5.4 to 7.0, was found to
be greater in the lower pH soils. Drier than normal soil
conditions during the growing season when imazethapyr was
applied, giving reduced microbial activity, also led to
Imazethapyr-tolerant ‘Clearfield’ rice was released to
producers in 2002. This allows the use of imazethapyr, a
broad-spectrum herbicide that will control red rice, annual
grasses, annual sedges, and many broadleaved and aquatic
weeds in rice.
removal of imazethapyr in aqueous solutions was studied
using powder TiO2 as semiconductor photocatalyst.
Experiments were conducted from 2000 to 2002 at two
locations each year to determine if lactofen and imazethapyr
injury to soybean could be detected using digital aerial
imagery and ground-based optical remote sensing.
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