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Target Pests

Imazapyr 4 SL Herbicide can control grasses such as bluegrass bahiagrass, barnyardgrass, bermudagrass, cattail, crabgrass, dallisgrass, fescue, goosegrass, itchgrass, johnsongrass, lovegrass, kentucky bluegrass, saltgrass, sandbur, wild barley, wild oats, witchgrass, and other listed grasses.

Imazapyr 4 SL Herbicide can control broadleaf weeds such as bull thistle, burclover, carpetweed, chickweed, clover, ragweed, dandelion, dock, fiddleneck, goldenrod, henbit, horseweed, kochia, milkweed, pigweed, primrose, smartweed, sorrell, sowthistle, spurge, sunflower, wild carrot, wild lettuce, yellow woodsorrell, and other listed weeds.

Imazapyr 4 SL Herbicide can also control vines and brambles, woody brush and certain trees as well as aquatic weeds.


For Use In

Imazapyr 4 SL Herbicide is for use in non-croplands such as utility, pipeline, railroad, utility plant sites, highway rights-of-way, petroleum tank farms, fence rows, storage areas, pumping installations, non-irrigation ditchbanks, under paved surfaces, rangeland, and grass pastures.,


In the State of New York, aquatic uses are not allowed. Alligare Imazapyr 4 SL is an aqueous solution intended to be mixed in water and surfactants( s) and applied as a post-emergent spray for control of most annual and perennial grasses, broadleaf weeds, vines, brambles, hardwood brush, trees for forestry site preparation and release of conifers from woody and herbaceous competition. This product may be used for selective woody and herbaceous weed control in natural regeneration of certain conifers (see pine release). This product may also be mixed in water and used for stump and cut-stem treatment for control of unwanted woody vegetation. This product can be applied along forest roads to control undesirable vegetation. This product can be used for the control of undesirable vegetation along non-irrigation ditchbanks and for the establishment and maintenance of wildlife openings. See use directions for stump and cut stem treatments and herbaceous weed control and use directions for spot treatment of undesirable hardwood vegetation. This product may be applied on forestry sites that contain areas of temporary surface water caused by the collection of water between planting beds, in equipment ruts, or in other depressions created by forest management activities, except in the state of New York. It is permissible to treat drainage ditches, intermittent drainage, intermittently flooded low lying sites, seasonally dry flood plains, and transitional areas between upland and lowland sites when no water is present, except in the state of New York. Only the edge of drainage ditches can be treated for drainage ditches that contain water. It is also permissible to treat marshes, swamps, and bogs after water has receded, as well as seasonally dry flood deltas, except in the state of New York. When applied postemeregence to weeds, Alligare Imazapyr 4 SL will control most annual and perennial grasses and broadleaf weeds in addition to many brush and vine species. Alligare Imazapyr 4 SL will provide residual control of labeled weeds which germinate in the treated areas. Postemergence application with a surfactant is the method of choice in most situations, particularly for perennial weeds. For maximum affect, weeds should be growing vigorously at postemergence application and the spray solution should include a surfactant. Alligare Imazapyr 4 SL solutions may be broadcast by using ground or aerial equipment, or may be applied as a spot treatment by using low-volume techniques. In addition, Alligare Imazapyr 4 SL may be used for stump and cut stem treatments. Alligare Imazapyr 4 SL controls vegetation by absorbtion through foliage and roots, from which it is translocated rapidly throughout the plant, where it accumulates in rapidly-growing meristematic tissue. Treated plants stop growing soon after spray treatment. Chlorosis (yellowing of plant tissue) first appears in the newest leaves and necrosis spreads from this point. In perennials, Alligare Imazapyr 4 SL is translocated into and kills the roots and underground storage tissues to prevent most regrowth. Chlorosis and tissue necrosis may not be apparent in some plant species for several weeks after application and may take months for various woody plants, brush and trees

Coverage Area

Coverage area of Imazapyr 4 SL Herbicide varies depending on application but not to exceed 3 pints per acre per year.

Time to Kill

Imazapyr 4 SL Herbicide begins to eliminate unwanted weeds within turf just after application but can take up to several weeks to completely kill of the target weeds.

Mix Rate

Mix at a rate of 1 1/3-6 2/3 ounce Imazapyr plus 1/3 ounce of non-ionic surfactant per gallon of water.

Active Ingredient

Isopropylamine salt of Imazapyr 52.6%

Imazapyr 4 SL

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Imazapyr 4 SL


Pre- and post-emergent, non-selective herbicide for control of undesirable vegetation in timber production sites including forest roads and non-irrigation ditchbanks.

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