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: