Smallflower umbrella sedge

Smallflower umbrella sedge

Populations of ALS-resistant smallflower umbrella sedge are present in Arkansas and California rice production, with propanil-resistance present in California, creating a management challenge. Management should take an integrated approach and utilize effective herbicide modes of action other than Group 2 & Group 7 herbicides in order to prevent further development of resistance.

Herbicide resistant populations:

  • Group 2 (ALS)
  • Group 7 (propanil)

Locations of resistant populations:

Arkansas, california

Resources:

Management of Propanil Resistant Sedges – University of California Rice Blog

How to Collect Sprangletop and Smallflower Umbrella Sedge Seeds for Herbicide Resistance Testing – University of California Rice Blog

Control Options for ALS-resistant smallflower umbrella sedge in Arkansas rice – University of Arkansas