Neonicotinoids include the common insecticide imidacloprid, and the related active ingredients acetamiprid, clothianidin, dinotefuran and thiamethoxam. These pesticides, which are typically diluted and applied to plant roots, are transported through the plant, where they help control sap sucking insects like aphids. Because the pesticide is also present in the plant's pollen and nectar, neonicotinoids have been linked to the decline in honey bees and other pollinators.
The European Union, Canada, Maine, New Jersey and several other states have already banned or restricted these pesticides for non-agricultural uses. Limiting lawn and garden neonicotinoid uses to trained professionals is intended to eliminate significant pollution from these pesticides in urban and suburban areas, protecting pollinators, aquatic organisms and human health.
The new law does not apply to indoor neonicotinoid pesticide products like ant baits, or veterinary products, such as flea and tick treatments for pets.
For more information about this law, see the California Department of Pesticide Regulation's September 2024 announcement.
(This article was originally in the Fall 2024 edition of the UC IPM Home and Garden Pest Newsletter.)