Industry News

Thiobencarb Exceedance at Second Monitoring Event

Thiobencarb Exceedance at Second Monitoring Event

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.

We realize the current weather conditions add to the challenge of maintaining a water hold while establishing a rice stand. Most thiobencarb applications have not been on the field long enough (19-days) to qualify for an emergency release.

Thiobencarb treated fields can be released at 6-days if water is retained on site, or to drains the grower controls. The county agricultural commissioner must evaluate the conditions if a closed or recirculating type system does not exist. If possible, it is best to move the water to a location that does not flow to a main drain.

Some counties are working with rice growers to evaluate options. The Rice Pesticide Water Management Requirements Summary from the Department of Pesticide Regulation might provide thoughts on decisions to release.

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Lambda-cyhalothrin to be extensively monitored in Rice this year

Lambda-cyhalothrin to be extensively monitored in Rice this year

We start monitoring Lambda-cyhalothrin (Warrior, Lambda-cy, Silencer, etc.) in the water column plus sediment sampling this year. The sampling takes place at the drain sites we use for thiobencarb monitoring. This will be our first experience with compliance to the Total Maximum Daily Load (TMDL) requirements. The TMDL is a forever monitoring program and we anticipate positive results leading to future modifications. We have never had an issue with our long history monitoring the pyrethroid insecticides. However, we have no ability to correlate the past results with the newer and much lower analytical methods.

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Here are Key Links and Updates for Rice Pesticides

Here are Key Links and Updates for Rice Pesticides

The following links include select pesticide updates as an effort to provide you with easy access to the information. Please remember the pesticide label is the ultimate level of enforcement and the county permit conditions can supersede the label with more restrictive requirements. You will find permit conditions and supplemental labels for thiobencarb. Permit conditions for some pesticides have been changed to active ingredient rather than trade or product name due to new product registrations. Products such as Butte Herbicide, RebelEx CA and RiceEdge 60DF are combination formulations and permit conditions could apply to one of the active ingredients. The EPA Reg. No. provides additional identification of the individual pesticide products on the Rice Pesticide Update Table.

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