Why are many foliar sprays of neonicotinoids not allowed in the US when flowers are blooming?

Question

BlackTom AI · Accepted Answer

The question asks why many foliar sprays of neonicotinoids are not allowed in the US when flowers are blooming.
Option 1: because this would result in a high concentration of neonicotinoids in hive products (honey and bee bread) thus exposing honey bees to a high dose of those pesticides. This reasoning centers on the risk pathway: bees collect nectar and pollen from blooming plants, and foliar applications can lead to residues in hive products, potentially delivering harmful doses to bees and contaminating honey and bee bread. This aligns with regulatory concerns about pollinator exposure and food-chain contamination.
Option 2: because foliar sprays are only effective when applied to plants that have NOT flowered. While timing can influence efficacy for some pesticides, this statement is incorrect as a general rule for neonicotinoids. Foliar sprays may be less effective on flowering crops due to systemic movement, but the claim that they are only effective on non-flowering plants is not an accurate or universally applicable characterization of neonicotinoid use or regulatory restrictions related to pollinator exposure.
In summary, the core regulatory concern behind restricting spraying during bloom is the potential buildup of residues in hive products and the consequent exposure risk to honey bees, rather than a blanket statement about efficacy on non-flowering plants.

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