Conventional Weed Control

Conventional weed control methods involve the use of synthetic herbicides, in combination with cultural management practices (Reitz, 2013). In the Pacific Northwest, herbicides with active ingredients such as pendimethalin, oxyfluorfen, and bromoxynil are used to manage weeds in onion crops. For the selective control of grass weeds, growers use Select ®, Fusilade ®, and Poast ® (Prostko, E., Culpepper, A.S., Murphy, T., & McCullough, P., 2009). Outlook ®, Dual Magnum ®, and crop rotation are important tools to control yellow nutsedge (Felix & Ishida, 2009).

Be sure to check herbicide labels and follow label guidelines. Chemical products that are registered for crops change over time and only labeled products should be used.


  • Felix, J., & Ishida, J. (2009). Control of Yellow Nutsedge with Effective Crop Rotations. OSU Malheur Experiment Station Sustainable Agricultural Techniques
  • Prostko, E., Culpepper, A. S., Murphy, T., & McCullough, P. (2009). HERBICIDE BRAND NAMES, ACTIVE INGREDIENTS, CHEMICAL FAMILIES, AND MODES OF ACTION. University of Georgia Extension Service
  • Reitz, S. (2013). Personal communication