You can still buy neonicotinoids in the UK for garden use. It's an absolute scandal. As far as I know they are widely used in agriculture. They are systemic insecticides that kill pollinating insects en masse. The two available to gardeners are imadacloprid and thiocloprid. In the UK they are often used as vine weevil killers by gardeners, and imadacloprid is in general use by farmers as the insecticide of choice. Well they kill far more than vine weevils. They also kill honey bees and bumble bees by the million. Arguably, the human race depends on pollination by bees for much of its food supply. Ecosystems depend on it just as much. These products should be banned outright. Thanks for reminding me.