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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 > Surflan XL 2G
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Surflan XL 2G

Common Name: benefin + oryzalin

Formulation: 1+1G

Uses: Preemergence control of many annual grasses and some broadleaf weeds in established container or field nursery stock and landscape plantings, including some flower bulbs, ground covers, and Christmas tree plantations. Product used in warm-season turf but will injure cool-season turf.

Amount of active ingredient

Amount by formulation

2G

Per Acre

4 to 6 lb.

200 to 300 lb.

Per 1,000 sq. ft.

4.6 to 6.9 lb.

Major Weeds Controlled: Annual grasses such as crabgrass, foxtail, and barnyardgrass and a few broadleaf weeds such as common chickweed and carpetweed. Provides partial control of horseweed and nightshade.

Major Weeds Not Controlled: Established weeds. Do not expect the same level or longevity of weed control as from the labeled rate of Surflan.

For Best Results: Apply before weed germination. Irrigation or rain (0.5 inches), or shallow cultivation (1 to 2 inches) is needed for activation. Cultivation or otherwise disturbing the soil surface after the initial incorporation may reduce control.

Cautions and Precautions: Do not make more than two applications per year to landscape and field grown ornamentals, Christmas tree plantations, and non-crop areas. Do not use in seedbeds or transplant beds. Not for use in greenhouses. May thin some established warm-season grasses at higher rates. Do not apply more than 400 to 600 lb. product per acre per year, depending on what's treated. Do not use on slender deutzia, Douglas fir, techny arborvitae, or eastern hemlock.

Residual Activity: About six to eight weeks of residual grass control may be expected. Residual control of broadleaves may be shorter.

Volatility and Leaching Potential: Some volatility and photodecomposition may occur. Irrigation immediately after application will minimize these effects. A limited amount of leaching can occur on coarse soils with low organic matter content.

Symptoms and Mode of Action: Both benefin and oryzalin inhibit cell division by disrupting tubulin formation. Classic symptoms of injury in grasses are stubby (short, thickened) roots. Diverse symptoms occur in susceptible dicots, from puckered and mottled foliage in herbaceous species to stem girdling and swelling at the ground line in fir, hemlock, and spruce seedlings.

Manufacturer: UPL NA

EPA Reg. No.: 70506-45