In October 1957, a beekeeper at a research station near Rio Claro, Brazil, took the queen excluders off some hives carrying African stock brought in to breed a better honey producer for the tropics. Twenty-six queens escaped with small swarms. The result was one of agriculture’s most effective pieces of branding — the “killer bee” — which produced real panic, a run of 1970s disaster films, and confident predictions that a swarm front would move up through the Americas and reach Canada. Nearly seventy years on, it’s worth checking those predictions against what actually happened.
Badly, as it turns out. The bees reached North America in 1985 and south Texas by 1990, then the advance slowed and stopped at around 34 degrees north — the limit several researchers had forecast back in the 1970s. Genome sequencing published in 2020 found the reason, and it isn’t complicated: bees carrying mostly African ancestry can’t survive a cold winter. That’s the entire northern limit. Not a quarantine, not an inspection programme, not a border — temperature. Thirty-five years after reaching Texas, they still haven’t reached Oregon.
The southern US, from southern California across the Southwest and Gulf states to Florida, is designated Africanized — infested, not merely at risk. Thousands of commercial beekeepers work that zone, running huge numbers of colonies, in the same veils and jackets used here, and it isn’t a crisis.
More telling is what happens every February, when the US industry runs the largest deliberate bee-mixing exercise on earth: more than two million colonies trucked into California for almond pollination, parked pallet to pallet for three or four weeks, drones drifting freely between operations, then hauled back out to Washington, Montana and the Dakotas. If Africanized drones were the contaminant CFIA’s risk assessment treats them as, this is precisely the mechanism that would have carried them into every commercial US operation decades ago. Those colonies then work right up along the 49th parallel, with drones drifting across it uninspected and unscreened every summer — wide open the whole time the package border has been shut, moving in the same direction as the risk CFIA is worried about, with none of the controls. In thirty-five years, that has produced no outbreak of defensiveness anywhere, in the northern states, on the Prairies, or here.
Nor has it produced litigation, in a country that is anything but shy about agricultural liability. No body of case law, no insurance products written for the exposure, no lawyer billboards — the signature that grows around every genuine hazard in American life is absent.
The death toll usually quoted — roughly a thousand deaths across two continents over seventy years — comes from press reports and case write-ups accumulated by people already writing about killer bees, not from any surveillance system; there’s no box on a death certificate for it. The best actual data, the US National Vital Statistics System, records a single combined category of hornet, wasp and bee stings: 788 deaths from 2011–2021, about 72 a year in a population of over 300 million, mostly anaphylaxis in people already vulnerable. It doesn’t distinguish a honey bee from a yellowjacket, let alone a European honey bee from an Africanized one. Nobody has ever actually counted deaths specifically attributable to Africanized bees.
The sharpest material, though, is CFIA’s own paper trail. In February 2003, the CFIA manager who commissioned the first risk assessment wrote to the assessor that the Health of Animals Act lets CFIA keep out a vector, a disease, or a toxic substance — and that “as AHB is none of those, CFIA has no authority to regulate it under that legislation.” He asked that it stay in the risk assessment anyway, and it did. The same doubt resurfaced in 2011, when correspondence to Alberta’s then provincial apiculturist relayed a colleague’s conclusion that CFIA lacked the legislative mandate to regulate an invasive species like AHB. The 2013 risk assessment kept the hazard in but shifted the justification to economic, public health and trade grounds. At trial in Paradis Honey Ltd. v. His Majesty the King, the Crown’s own counsel conceded it may be that there was no statutory basis for treating Africanized bees this way, and the court’s finding on the record, 2024 FC 1921, is that CFIA knew it was at least likely to lack the legislative authority to regulate imported US honeybees as a vector, disease or toxic substance at all.
The CFIA’s August 2025 risk analysis — the one that kept the border closed again — still lists the Africanized honey bee as one of its four hazards.
Read the full article The Killer Bees are Still Not Coming Article – Final.