NC State Extension Publications


Trade Name: Sureguard Common Name: flumioxazin Formulation: 51 DG, 4L


Preemergence and early postemergence control of many annual broadleaf weeds and preemergence control of many annual grasses in established container and field grown woody ornamentals. Typically used as a directed application to avoid injury to desirable foliage but can be broadcast applied to some conifers. Often tank mixed with a non-selective herbicide, such as glyphosate, for POST and PRE weed control.

Amount of Active Ingredient

Amount by Formulation

51 DG

4 L

Per Acre

0.25 - 0.375

0.5 to 0.75 lb (8 to 12 oz.)

8 to 12 fl oz

Per 1,000 sq. ft.

5.2 to 7.8 grams

5.4 ml to 8 ml

Major Weeds Controlled

Most annual broadleaf weeds common in container and field grown nursery crops including: bittercress, spurge, woodsorrel, phyllanthus, groundsel, chickweed, morningglory, doveweed, horseweed, liverwort and others. Eclipta control has been good at some locations and fair at others. Acceptable control of crabgrass is achieved but control declines with reduced dose and over time. Primarily used preemergence but will control many small seedling broadleaf seeds.

Major Weeds Not Controlled

Nutsedges are not controlled. Sometimes weak on pearlwort, chickweed, evening primrose, marsh parsley and annual grasses.

For Best Results

Apply before weeds emerge. Irrigate immediately following treatment. Postemergence applications should be applied to seedling weeds. Older weeds will be injured but not killed.

Cautions and Precautions

Do not apply over the top of broadleaf ornamentals. Do not apply in greenhouses if plants are present. Do not move plants into treated greenhouses until 24 hours after the treated area has been irrigated.

Residual Activity

Two to three months of annual broadleaf weed control. Somewhat less for annual grasses and eclipta.

Volatility and Leaching Potential

Moderately volatile but readily absorbed by soil organic matter. Leaching is not expected to be significant.

Symptoms and Mode of Action

The most common injury symptom is localized necrotic spots (contact burn) on leaves and green stems contacted by the spray. Symptoms develop rapidly, within days. Herbicide is generally not systemic, but in some susceptible species young plants (e.g. wax myrtle and spiraea) development of red pigments in the main veins of leaves, suggests translocation. Mode of action: protoporphyrinogen Oxidase (PPO) Inhibitor. HRAC Group E; WSSA Group 14.

Additional Information

Worker Protection Standards REI: 12 hours
PPE: coveralls, chemical resistant gloves, shoes plus socks
Manufacturer: Valent EPA Reg. # 59639-120


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

Publication date: June 6, 2016

North Carolina State University and North Carolina A&T State University commit themselves to positive action to secure equal opportunity regardless of race, color, creed, national origin, religion, sex, age, veteran status or disability. In addition, the two Universities welcome all persons without regard to sexual orientation.