Apiary training sponsored by DPR,
Parlier, CA June 2014
Neonicotinoid Reevaluation Background and Progress Towards Protecting Pollinator Health
The California Department of Pesticide Regulation (DPR) is at the national forefront of the effort to protect bee health, taking proactive steps and a scientific approach to address concerns about the impact of pesticides on pollinator health. One such step includes the reevaluation of certain pesticide products containing the nitroguanidine-substituted neonicotinoid active ingredients, imidacloprid, thiamethoxam, clothianidin, and dinotefuran. The reevaluation was initiated in 2009 based on imidacloprid adverse effects data. These studies indicated a possible hazard to pollinators with two findings: high levels of imidacloprid residue in leaves and blossoms of treated plants and increases in residue levels over time. Thiamethoxam, dinotefuran, and clothianidin are in the same chemical family as imidacloprid, known as the nitroguanidine insecticide class of neonicotinoids, and have similar properties and characteristics.
DPR required comprehensive pollinator data as a part of its reevaluation. Registrants submitted numerous studies, which DPR evaluated to identify risks to pollinators. In July 2018, DPR published the California Neonicotinoid Risk Determination. On January 2019, DPR published an Addendum to the July 2018 California Neonicotinoid Risk Determination after receiving additional information and in an effort to report the most accurate information possible.
As a result of the reevaluation, which included issuance of a Neonicotinoid Risk Determination, DPR determined that additional mitigation measures are needed to protect pollinators from the use of neonicotinoids in agricultural crops. DPR developed regulations to implement necessary mitigation measure by limiting the agricultural uses of neonicotinoids.
Regulations and Additional Information
DPR adopted sections 6990 through 6990.16 of Title 3, California Code of Regulations as control measures necessary to protect pollinator health. The regulations affect food and feed use production agricultural applications of pesticide products containing the nitroguanidine-substituted neonicotinoid active ingredients, clothianidin, dinotefuran, imidacloprid, and thiamethoxam. The control measures consist of application method and rate restrictions, application timing restrictions, and seasonal application rate caps for the four neonicotinoid active ingredients and are specific based on crop group.
The regulations will go into effect on January 1, 2024.
All documents associated with the rulemaking are available on the Webpage titled DPR 22-001 Neonicotinoid Pesticide Exposure Protection.
- Final Text of Regulations, PDF
- Summary and Response to Comments Received During the 60-Day Comment Period, PDF
- Summary and Response to Comments Received During the 15-Day Comment Period, PDF
- Economic Analyses by CDFA, July 2, 2021, PDF
- Updated Calculations for Conversion Factor Method to Use Bee-Collected Soybean Nectar Residues in Neonicotinoid Risk Determination, PDF
- Update to the Identification of Crop Residue Studies for Development of Proposed Pollinator Protection Regulations in Response to the Neonicotinoid Reevaluation, PDF
- DPR’s Response to Public Comments Received in Response to August 2020 Neonicotinoid Webinars, PDF
- Response to the External Scientific Peer Review Comments on DPR’s Neonicotinoid Risk Determination, PDF
- Additional Information Related to the Department of Pesticide Regulation’s (DPR’s) 2018 California Neonicotinoid Risk Determination and Addendum, PDF
- Addendum to the California Neonicotinoid Risk Determination, PDF
Other Information and Proactive Actions to Protect Pollinator Health
- Pollinator Protection
- Decision to Initiate Reevaluation of Chemicals in the Nitroguanidine Insecticide Class of Neonicotinoids, PDF
- U.S. EPA's Pollinator Protection
- Health Canada Pest Management Regulatory Agency Consultations
For more information on the Neonicotinoid Reevaluation, visit the Reevaluation Program page to view the current semiannual report summarizing the status of each reevaluation.
For content questions, contact:
1001 I Street, P. O. Box 4015
Sacramento, CA 95812-4015
Phone: (916) 324-3896