NC State Extension Publications

Introduction

Trade Name: Fusilade II, Ornamec, others Common Name: fluazifop-P-butyl Formulations: 0.125 EC, 2 EC

Uses

Selective postemergence control of annual and perennial grasses. May be applied over the top of many ornamentals including many woody and herbaceous ornamentals in container and field nurseries, landscapes and greenhouses. May also be used for bermudagrass suppression in tall fescue turf (see label for specific guidelines).

Amount of Active Ingredient Amount by Formulation
0.125 EC 2 EC
Per Acre 0.25 to 0.375 lb ai 2 to 3 gal 16 to 24 fl oz
Per 1,000 sq. ft. 6 to 9 fl oz 0.4 to 0.6 fl oz
Spot Treatment (amount per gallon) 10 fl oz .075 fl oz

Major Weeds Controlled

Annual and most perennial grasses.

Major Weeds Not Controlled

Annual bluegrass, broadleaf weeds, sedges, rushes, lilies, and other nongrasses are not controlled. Red fescue, and sweet vernal grass have shown considerable tolerance. At low doses, tall fescue is not controlled.

For Best Results

Add a nonionic surfactant, 0.25% by volume. Some ready-to-use formulations are available; do not add additional surfactant to such formulations. Spray annual grasses at 2 to 8 inches tall. For perennial grass, spray during the spring growth flush but before heading. Cultivation two to three weeks after treatment may assist weed control. Thorough coverage is essential for optimum results; spray to cover but not to runoff. Optimum control is attained when weeds are not stressed.

Cautions and Precautions

Use only nonionic surfactants. Do not apply if rain is expected within 1 hour. Do not tank mix with other pesticides or fertilizers except as instructed on the label. A number of broadleaf ornamentals and conifers may be injured by over the top applications of fluazifop-p. Check the label restrictions on bluegreen junipers, azalea cultivars, and other species. Directed sprays are required to prevent unacceptable injury on these species. Do not apply to plants that may be harvested for food within one year.

Residual Activity

Up to two weeks of soil residual activity has been reported.

Volatility and Leaching Potential

Low volatility and negligible leaching occur when used as directed.

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, and plants die within 14 days. Inhibits cell division by blocking acetyl Co A carboxylase, a lipid biosynthesis enzyme. MOA groups: WSSA Group 1; HRAC Group A.

Herbicide injury symptom factsheet

Additional Information

Worker Protection Standards REI: 12 hours
PPE: coveralls, chemical-resistant gloves, shoes plus socks
Manufacturer: Syngenta, PBI Gordon Corp., others EPA Reg. # 100-1084, others

Author

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

Publication date: May 9, 2016

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