Water Quality

Water Quality •

Thiobencarb Monitoring Season Starts Tomorrow

Thiobencarb Monitoring Season Starts Tomorrow

Monitoring for 2021

Thiobencarb monitoring starts tomorrow, April 27. We base the monitoring on planting dates and timing of thiobencarb applications from the county agricultural commissioner offices sharing dates from notices of intent. 

Monitoring will take place on Tuesdays, Wednesdays and Thursdays due to concurrent sampling in the Rice WDR and the Pyrethroid TMDL. The Rice WDR surface water monitoring is a modified assessment schedule at seven sites and to include parameters beyond pesticides. The Pyrethroid TMDL is a more extensive schedule, which evaluates water column and sediment toxicity for lambda-cyhalothrin. The total thiobencarb monitoring will remain a ten-week schedule with the same number of samples as previous years. 

Changes to the REI and field posting

Both Valent and Generic Crop Sciences assure us the container label language includes the 12-hour restricted entry interval (REI). Any containers with labeling for a 7-day REI requires supplemental labeling present and available (in-hand) at time of application. You can receive the supplemental label from your Valent representative, thiobencarb suppliers or a link to the CRC pesticide update provided in a previous e-communication on March 31. 

Here’s a link to the thiobencarb water hold table with information on other pesticides.

For more information, contact the CRC’s Industry Affairs Manager Roberta Firoved at rfiroved@calrice.org or (916) 206-5039.

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Rice Water Quality Programs Monitoring Update
Water Quality •

Rice Water Quality Programs Monitoring Update

Monitoring for 2025 is halfway complete.

The 2025 surface water monitoring under the RPP and WDR programs is ongoing.

For the Rice Pesticide Program (RPP), there have been a handful of detections in late May, none of which were above the agricultural drain performance goal.  The latest results from early June were non-detectable.  

The Rice Waste Discharge Requirements (WDR) surface water program is in an assessment year, which means additional sampling for pesticides and toxicity.

Pyrethroids used in rice have been reported in association with water toxicity at the upper Colusa Basin Drain this year for multiple events.  The California Rice Commission (CRC) sent out letters earlier this year requesting the use reporting information (to be submitted in the fall) for pyrethroid users in the area.  Algal water toxicity was reported in the Sacramento Slough near Karnak as well.  

The CRC continues to work on behalf of the industry to conduct required monitoring and interface in reporting with the Water Board.  Additional efforts are underway to assess and analyze water quality trends across the valley and gather information from industry on uses and operational patterns.

We appreciate the industry’s support of the regulatory programs and their good stewardship of the commercial products used and protection of the environment.

For more information, contact the CRC’s Industry Affairs Manager Craig Riddle at criddle@calrice.org.