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Information @ Glance

General

  • Oxyfluorfen [2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene] is a pre- and
    postemergence diphenyl ether herbicide registered for use on a variety of field crops, vegetables,
    and fruit trees.
  • It is a contact herbicide and light is required for it to affect target plants. It is available in emulsifiable concentrate
    and granular formulations.
  • Oxyfluorfen is a white to orange or red-brown crystalline solid with a smoke-like odor.
  • Oxyfluorfen is a slightly to practically non-toxic compound in EPA toxicity class III.
  • Oxyfluorfen has a low acute oral, dermal and inhalative toxicity. It is not a skin or eye irritant, or a
    skin sensitiser.

Uses

  • Used to Control of annual broadleaf and grassy weeds in artichoke, avocado, broccoli, cabbage, cauliflower (pretransplant), citrus (nonbearing), coffee, conifers, corn (witchweed control), cotton (postdirect), fallow bed, grapes, guava, horseradish, jojoba, kiwi, macadamia, mayhaw, mint, noncropland, nuts, olives, onion, ornamentals, papaya, persimmon, taro, and tree fruits.
  • Oxyfluorfen is also used for weed control in landscapes, patios, driveways, and similar areas in residential sites.
  • Oxyfluorfen use is widespread but the monitoring data are limited to a few location.
  • Oxyfluorfen use on citrus is limited to non-bearing citrus which precludes large portions of watersheds from being treated simultaneously, as is simulated by the model.
  • Uses Control of annual broad-leaved weeds and grasses in a variety of tropical and subtropical crops, by pre- or
    post-emergence application at rates in the range 0.25-2.0 kg/ha.

Report

  • Oxyfluorfen was first registered in the United States in 1979 to control pre-emergent and post-emergent broadleaf and grassy weeds in a variety of field, fruit, and vegetable crops, ornamentals, as well as non-crop sites.
  • Globally the different studies show oxyfluorfen to be rapidly and extensively degraded in plants. The metabolism proceeds first by cleavage of the parent structure at the ether bond between the two phenyl rings, followed by further degradations of the chlorophenyl ring to TFAA.
  • Some samples have been collected and analyzed for oxyfluorfen in water and sediments in the Columbia River basin of Oregon and Washington as a result of an August, 2000 oxyfluorfen spill into creek yards which feed into the Columbia River. Of 35 background sediment measurements made in nearby rivers and streams which were unaffected by the spill, 2
    detections of oxyfluorfen in sediment were noted. The highest detection, 541 ppb, was downstream of orchards.
  • Dissipation of oxyfluorfen under field conditions was investigated in seven different sites and on bare soils, three in North America (2 sites in California, USA and 1 site in British Columbia, Canada) and four in Europe (England, Northern France, Spain and Italy)
  • Oxyfluorfen homeowner products are intended solely for spot treatment; they are not used for broadcast treatment of lawns  because they kill grass.
     

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