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Crop and Pest Management Guidelines

A Cornell Cooperative Extension Publication
Skip Navigation LinksHome > Cornell Guidelines > 2024 Trees and Shrubs Table of Contents > 4 Weed Management in Nursery Crops > 4.8 Description and Characteristics of Herbicides Registered for Nursery and Landscape Use > Segment II
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Segment II

Common Name: sethoxydim

Formulation: 1.5EC

Uses: Selective broad spectrum postemergence, over the top, or directed herbicide for the control of annual and perennial grasses in turf, ornamentals, non-crop sites, and Christmas trees.

Amount of active ingredient

Amount by formulation

1EC

Per Acre

0.3 to 0.5 lb.

2.25 to 3.75 pt.

Per 1,000 sq. ft.

0.8 to 1.4 fl. oz.

Spot Treatment (spray solution)

2 to 3 fl. oz./gal. water

Major Weeds Controlled: Emerged annual and perennial grasses.

Major Weeds Not Controlled: Annual or perennial sedges, annual bluegrass, and broadleaf weeds. Red, chewing, and hard fescues, sweet vernal grass, and dicondra turfs are also tolerant.

For Best Results: Apply to small, actively growing grasses that have not been mowed. Spray to wet but not to the point of runoff. Thorough coverage is essential. For optimal control of perennial grasses, apply in the spring when grasses are 4 to 8 inches tall.

Cautions and Precautions: Do not cultivate within five days before or within seven days following application. Do not apply when rain or irrigation will occur within one hour. Injury has been reported on some varieties of azalea, potentilla, Japanese privet, and red and white oak. These instances have usually been associated with higher than labeled rates. Do not apply to nonbearing food crops within one year of harvest. Repeated use may lead to selection of naturally occurring biotypes with resistance to this product.

Residual Activity: Primarily a foliar-applied, postemergent herbicide. No soil residual activity should be expected. However, do not seed grass crops for two weeks following applications.

Volatility and Leaching Potential: Loss from volatility is minimal. Little potential for leaching because sethoxydim is rapidly decomposed in soil.

Symptoms and Mode of Action: Growth inhibition occurs within 48 hr. Meristems turn black shortly thereafter. Yellow to red foliage develops in about 7 to 10 days, leading to death within about 14 days. Inhibits cell division by blocking acetyl Co A carboxylase, an enzyme involved in lipid biosynthesis.

Manufacturers: BASF

EPA Reg. No.: 7969-398