Skip to main content

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 > OH2
Page Contents
44778

OH2

Common Name: oxyfluorfen+pendimethalin

Formulation: 2+1G

Use: Preemergence control of grass and broadleaf weeds in container and field grown ornamentals.

Amount of active ingredient

Amount by formulation

3G

Per Acre

3 lb.

100 lb.

Per 1,000 sq. ft.

2.3 lb.

Major Weeds Controlled: Many annual grasses and broadleaf weeds.

Major Weeds Not Controlled: Perennial weeds, established weeds.

For Best Results: Do not incorporate physically. Irrigate immediately after application with 1/2 to 1 inch water to remove particles from foliage and to activate herbicide. Do not exceed 6 lb. AI per acre per season.

Cautions and Precautions: Apply to dry foliage only. Do not apply while plants are producing a new flush of spring growth. Do not apply to plants with leaves that channel granules to the leaf base. Do not use in greenhouses or within two weeks prior to enclosing in a structure or within two weeks prior to shipping. See label for list of species on which application is not warranted. To delay herbicide resistance, avoid concurrent or consecutive use of this product with other Group 3 or Group 14 herbicides.

Residual Activity: Eight to twelve weeks of weed control can be expected, depending on the growing medium and irrigation practices.

Volatility and Leaching Potential: Low volatility and low leaching potential. However, do not apply in enclosed structures because volatilization is possible. In container nurseries, surface runoff may result when broadcast applications are employed, because many granules fall between pots. Otherwise, the potential for leaching and surface runoff is very low.

Symptoms and Mode of Action: Oxyfluorfen acts as a contact herbicide, disrupting cell membranes via a mechanism that requires light for activation. Pendimethalin inhibits root development by affecting cell division. See the descriptions for Goal and Pendulum for more details. Injury symptoms on ornamentals include contact-type burn where granules are trapped on the foliage and girdling at the soil line on some azalea cultivars.

Manufacturer: Everris

EPA Reg. No.: 58185-178