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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 > Biathlon
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Biathlon

Common Name: oxyfluorfen + prodiamine

Formulation: 2 + 0.75 G

Uses: Preemergence control of weeds in field and container ornamentals, grounds maintenance and other specified non-crop areas and for evergreen (broadleaf and needle) limited to Christmas tree farms and conifer farms.

Amount of active ingredient

Amount by formulation

2.75G

Per Acre

2.75 lb.

100 lb.

Per 1,000 sq. ft.

2.3 lb.

Major Weeds Controlled: Grass weeds, such as annual bluegrass, crabgrass, and goosegrass and broadleaf weeds, such as bittercress, pigweed, and chickweed.

Major Weeds Not Controlled: Established weeds.

For Best Results: Apply in early spring or fall prior to weed seed germination or following complete weed removal. Irrigate before application to firm soil around roots. Apply at least 0.5 inch irrigation or rainfall within 24 hours. Apply to dry foliage only and immediately wash the particles off plant foliage. Do not apply while plants are producing new flush of growth.

Cautions and Precautions: Do not apply directly to water, to areas where surface water is present, or to intertidal areas below the mean high water mark. Runoff from treatment areas may be hazardous to aquatic organisms in neighboring areas. A maximum of two applications may be made in a growing season. Do not reapply at less than three month intervals for field-grown ornamentals and less than two month intervals for Christmas trees. See label for list of plants for which injury has been observed and use is not recommended.

Residual Activity: Creates a barrier in the soil and is active for several months.

Volatility and Leaching Potential: Photodecomposition and volatilization occur when the prodiamine remains on the surface for prolonged periods without incorporation. Prodiamine is strongly adsorbed by soil; not readily leached. Oxyfluorfen is relatively highly water soluble and has moderate leaching potential, greatest in coarse-textured soils with frequent irrigation.

Symptoms and Mode of Action: Inhibits cell division and disrupts cell wall formation in shoots and roots of emerging seedling weeds.

Manufacturer: OHP

EPA Reg. No.: 59807-12