Imazapyr is a non-selective herbicide used for the control of a broad range of weeds including terrestrial annual and perennial grasses and broadleaved herbs, woody species, and riparian and emergent aquatic species.
Formulations that can be used on aquatic vegetation in Wisconsin include Habitat™, Ecomazapyr 2sl™, Imazapyr 2sl™, and Polaris AC. Imazapyr is used for control of emergent and floating-leaf vegetation. It is not recommended for control of submersed vegetation. Please call (608) 267-7694 for more information. Formulations Imazapyr was registered with the EPA for aquatic use in 2003. The active ingredient is isopropylamine salt of imazapyr, (2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1 H-imidazol-2-yl]-3-pyridinecarboxylic acid). Introduction Imazapyr is an imidazolinone herbicide used to control grasses, broadleaves, vines, brambles, brush, and trees. Imazapyr disrupts an enzyme (found only in plants) necessary for protein synthesis, and interferes with cell growth and DNA synthesis in plants.  From Wikipedia, the free encyclopedia. Imazapyr is a non-selective herbicide used for the control of a broad range of weeds including terrestrial annual and perennial grasses and broadleaved herbs, woody species, and riparian and emergent aquatic species. It is used to eliminate Lithocarpus densiflorus (Tan Oak) and Arbutus menziesii (Pacific Madrone). Additionally, imazapyr is used to control annual and perennial grass and broadleaved weeds, brush, vines and many deciduous trees. Imazapyr is absorbed by the leaves and roots, and moves rapidly through the plant. It accumulates in the meristem region (active growth region) of the plant Herbicide Degradation, Persistence and Trace Contaminants Imazapyr is broken down in the water by light and has a half-life (the time it takes for half of the active ingredient to degrade) ranging from three to five days. Please call (608) 267-7694 for more information. Formulations Imazapyr was registered with the EPA for aquatic use in 2003. The active ingredient is isopropylamine salt of imazapyr, (2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1 H-imidazol-2-yl]-3-pyridinecarboxylic acid). Imazapyr. Imazapyr is a non-selective herbicide used for the control of a broad range of weeds including terrestrial annual and perennial grasses and broadleaved herbs, woody species, and riparian and emergent aquatic species. It is used to eliminate Lithocarpus densiflorus and Arbutus menziesii.  Caution should be used when applying imazapyr, as a few reports to TNC from the field indicate that imazapyr might be exuded from the roots of target species. Some legume species, such as mesquite, may actively exude imazapyr (J. Vollmer pers. comm.). It is not, however, degraded significantly by photolysis or other chemical reactions. The half-life of imazapyr in soil ranges from one to five months. In aqueous solutions, imazapyr may undergo photodegradation with a half-life of two days. The active ingredient, imazapyr, is a foliar and soil active herbicide (absorbed by foliage, stems, and roots). with relatively broad spectrum control of many tree, shrub, vine, broadleaf, and grass weeds. Imazapyr is. typically applied as a broadcast spray over unwanted vegetation prior to planting (Photo 1).  These degradates persist in water for approximately the same amount of time as imazapyr (half-lives of three to eight days). In soils imazapyr is broken down by microbes, and persists with a half-life of one to five months. Please call (608) 267-7694 for more information. Formulations Imazapyr was registered with the EPA for aquatic use in 2003. The active ingredient is isopropylamine salt of imazapyr, (2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1 H-imidazol-2-yl]-3-pyridinecarboxylic acid). 50 of 21 unformulated imazapyr is greater than 5000 mg/kg, and the chronic dietary NOAEL for 22 imazapyr is 10,000 ppm in dogs, rats, and mice. In the dog, this dietary concentration is 23 equivalent to a daily dose of 250 mg/kg/day. In the other species, the equivalent daily doses are 24 greater than 250 mg/kg/day. Euphorbia esula) after foliar treatments with 14 C-14 imazapyr. By day 8 after application, 14% of the applied imazapyr remained in the leaf tissue, 15 while 17% was transported to the root system. In terms of total absorption, 62.5% of the applied 16 radioactivity was absorbed by day 2 and 80.0% by day 8.
http://dnr.wi.gov/lakes/plants/factsheets/ImazapyrFactsheet.pdf http://www.wsdot.wa.gov/NR/rdonlyres/C8EB1611-2699-48FB-B5B8-161D1223BC92/0/imazapyr.pdf https://en.wikipedia.org/wiki/Imazapyr http://dnr.wi.gov/lakes/plants/factsheets/ImazapyrFactsheet.pdf http://www.definitions.net/definition/imazapyr http://www.invasive.org/gist/products/handbook/17.Imazapyr.pdf http://www.bugwood.org/Imazapyr_Site_Prep_4-2012.pdf http://dnr.wi.gov/lakes/plants/factsheets/ImazapyrFactsheet.pdf http://www.fs.fed.us/foresthealth/pesticide/pdfs/Imazapyr_TR-052-29-03a.pdf
what is imazapyr