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Pyrethroid TMDL Monitoring Reveals Concerns

Pyrethroid TMDL Monitoring Reveals Concerns

The monitoring results are 12.5 percent survival at CBD5 on May 4. Two days later, the same site received the first thiobencarb detection for the season. We will follow up with the Colusa County Agricultural Commission to track applications close to the site. 

This is the first year we are monitoring pyrethroid insecticides under a Total Maximum Daily Load (TMDL) program. The pyrethroid applied to rice is lambda-cyhalothrin (Warrior, Lambda-Cy, Silencer, etc.).

Hopefully, this is an isolated event and we do not need to implement management practices to maintain compliance with the TMDL. 

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

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