On February 26, 2009, the Department of Pesticide Regulation (DPR) placed into reevaluation certain pesticide products containing the neonicotinoids imidacloprid, clothianidin, dinotefuran, and thiamethoxam.
The reevaluation is based on an adverse effects disclosure submitted to DPR regarding the active ingredient imidacloprid. DPR’s evaluation of the adverse effects data noted two critical findings: high levels of imidacloprid in leaves and blossoms of treated plants, and increases in residue levels over time. Clothianidin, dinotefuran and thiamethoxam are in the same chemical family as imidacloprid, and characteristics in common. They have similar soil mobility and half-lives, and similar toxicity to honeybees.
- Reevaluation notice, PDF (59 kb)
- List of products included in reevaluation, PDF (68 kb)
- Example letters to registrants, PDF (233 kb) (September 15, 2009)
- Honey bee larval toxicity testing protocol, PDF (840 kb)
For content questions, contact:
1001 I Street, P. O. Box 4015
Sacramento, CA 95812-4015
Phone: (916) 324-3522