Thiobencarb monitoring results report numbers at most sites on May 30 and June 4. The monitoring numbers exceeded the 1.5 µg/L (parts per billion) performance goal at the upper part of Colusa Basin Drain (CBD5) on May 30, and the lower part of the drainage (CBD1) May 30 and June 4. This now counts as seven exceedances of the performance goal into the sixth week of monitoring.
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Memorial Day weekend typically marks the fifth week of thiobencarb monitoring with peak use and numbers exceeding the 1.5 µg/L (parts per million) performance goal. For this atypical year, the holiday marked the fourth week of monitoring with numbers at all sites except the Sacramento River location. The monitoring results recovered to acceptable levels after a rough start where the performance goal was exceeded two and three weeks into the program.
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Today’s Circle of Life Reception in Sacramento provided an excellent opportunity to convey the importance of California Rice to key audiences.
We recorded our second-highest turnout, with 149 on hand at the Sheraton Grand Sacramento.
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Growers will soon receive nomination forms for the upcoming CRC Board of Directors election. All producers who produce or cause to be produced rice in a district are encouraged to consider running for one of the open seats. Member and alternate seats are open in District 1, 3, 4, 5.
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Thiobencarb exceedances over the 1.5 µg/L (parts per million) performance goal with a reading of 2.3 µg/L at the Colusa Basin Drain 5 (CBD5) site off Highway 20 and 2.7 µg/L at the Colusa Basin Drain 1 (CBD1) location outside Knights Landing. There also was a detectable reading at the Sacramento Slough site. These exceedances were from the third monitoring event on May 21.
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University of California Cooperative Extension Specialist Bruce Linquist and Rice Farming Systems Advisor Luis Espino have written this new update, regarding some of the areas growers should consider, faced with this cool, wet spring.
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Here’s a link to a new blog from Bruce Linquist, UC Cooperative Extension Specialist.
Bruce covers three scenarios that may arise, following this month’s heavy rainfall during rice planting.
Thiobencarb exceeded the 1.5 µg/L (parts per million) performance goal to a reading of 2.3 µg/L at the Colusa Basin Drain 5 (CBD5) site off Highway 20. A monitoring site receiving drainage from Colusa and Glenn Counties. This particular exceedance was at the second monitoring event on May 14.
Pyrethroid insecticides have been under scrutiny for several years resulting in recent changes to water quality requirements. The changes set monitoring levels for pyrethroids at nanograms in surface waters. Consistent exceedances of the levels could result in additional restrictions to pyrethroid use, or designate a drain as impaired with future restoration to correct the water quality. Last year, one of the water quality coalitions had a detection that could be problematic under the new standards.
Weekly monitoring will start at all sites tomorrow, May 7. We increase monitoring around the Memorial Day holiday weekend with the program continuing into July.
