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When herbicide resistance is the problem, you will find healthy plants alongside dead ones of the same species after treatment. Surviving weeds form discrete patches that consistently survive the herbicide treatment.
The UCCE Rice Weeds Program conducts herbicide resistance testing for the major rice herbicides used in California at the Rice Experiment Station (RES) in Biggs. The results of these tests help growers improve their weed control programs and also help the rice industry keep track of resistance issues.
Weed testing form
If you suspect herbicide resistance, collect seeds of the target weed, and fill out the resistant weed seed testing form available online at http://cecolusa.ucanr.edu/newsletters/Rice_Briefs_Newsletter58741.pdf. Bring these to your local UC rice farm advisor, or send or drop off at the RES for testing.
