NC State Extension Publications

Introduction

Trade Name: Acclaim Extra Common Name: fenoxaprop-p Formulations: 0.57 EC

Uses

Postemergence control of annual grassy weeds in established cool-season turfgrass, nursery crops, and many landscape ornamentals including trees, shrubs, herbaceous perennials, and annuals.

Amount of Active Ingredient Amount by Formulation
0.57 EC
Per Acre 0.06 to 0.17 lb 13 to 39 oz
Per 1,000 sq ft 0.3 to 0.9 oz
Spot Treatment (per gallon) 0.3 to 0.46 oz

Recommended rates for annual grass control:

Growth Stage lb ai/A oz/A oz/A oz/1,000 sq ft
seedling (no tillers) 0.06 13 0.3
1-2 tillers 0.09 20 0.46
3-4 tillers 0.12 28 0.64
4-5 tillers 0.17 39 0.9

Major Weeds Controlled

Annual grasses such as crabgrass, goosegrass, Japanese stiltgrass, barnyardgrass, foxtails, panicum and johnsongrass. Bermudagrass is suppressed (but not killed) with repeated applications.

Major Weeds Not Controlled

Annual bluegrass, broadleaf weeds, and sedges. Most perennial grasses are not well controlled. Cool-season perennial grasses are not controlled.

For Best Results

Apply to young (seedling to three tiller), actively growing grasses. May be tank mixed following label directions with other preemergence and postemergence herbicides. Thorough spray coverage is essential for optimum results. Flat fan nozzles are recommended. Addition of a surfactant may improve control in spot treatments but is generally not required.

Cautions and Precautions

Do not use on Bar Harbor juniper, Salvia, Pittosporum, or Podocarpus. Check label for other species restrictions. Weed and crop tolerance may vary according to environmental conditions, and tolerance should be determined prior to extensive use. Temporary stunting or chlorosis may occur on succulent, rapidly growing ornamentals. Do not apply more than 121 oz per acre per growing season. Tank mixing with phenoxy herbicides reduces effectiveness.

Residual Activity

Rapidly decomposed by soil microorganisms but up to two weeks of residual grass control has been reported.

Volatility and Leaching Potential

Loss from volatility is minimal. Leaching is negligible.

Symptoms and Mode of Action

Growth inhibition occurs within 48 hours. Meristems turn black shortly thereafter. Yellow to red foliage develops in about 7 to 10 days; plants die in about 14 days. Mechanism of action involves inhibition of lipid synthesis at the root and shoot meristems. HRAC Group A; WSSA Group 1.

See the Herbicide Injury – ACCase Inhibitors factsheet for more information.

Additional Information

Worker Protection Standards REI: 24 hours
PPE: coveralls, chemical resistant gloves, shoes plus socks
Manufacturer: Bayer EPA Reg. # 432-950

Author:

Professor of Weed Science, Extension Specialist & Department Extension Leader
Horticultural Science

Publication date: Feb. 27, 2017

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