Every spring, Canadian beekeepers wait for queens.

That sentence sounds simple, but it explains a major weakness in the way our beekeeping system works. A colony needs a queen to build population, replace winter losses, produce workers, and prepare for the season ahead. But in Canada, our climate does not produce enough early mated queens when beekeepers need them most. So every spring, large numbers of queens are brought in from warmer places.

University of Guelph researchers are now looking at one of the most important questions behind that system: are imported queens and domestic queens carrying different microbial communities, and could those differences help explain colony resilience, queen performance, and overwintering success?

This is not a small question. Queen health sits at the centre of the colony. If the queen is weak, poorly mated, diseased, stressed, or unable to maintain strong brood production, the colony can fall behind before the beekeeper sees the full problem. In Ontario, where winter survival depends on strong late-summer and fall bees, queen performance is not just a spring issue. It is part of the winter plan.

Canada depends heavily on imported queens

Canada imports approximately 260,000 to 300,000 queen bees each year from warmer regions such as Hawaii, California, Chile, and New Zealand because domestic production cannot meet spring demand. University of Guelph researchers Brendan Daisley and Elizabeth Mallory described this system as functional but fragile: it helps beekeepers rebuild quickly, but it also leaves the industry dependent on outside queen supply.

The timing problem is biological. Ontario and much of Canada cannot reliably produce large numbers of well-mated queens early enough in spring. Queens need warm enough weather for mating flights, mature drones, good flight windows, and proper colony conditions. After a bad winter, beekeepers may need queens immediately, before local queen production is ready.

Imported queens help solve that timing problem. They allow beekeepers to requeen dead-out replacements, correct queenless colonies, make early splits, and get commercial operations moving before the local season catches up.

But imported queens are not a complete solution.

A queen produced in a warmer region has not been selected under Ontario winter conditions. She may perform well, and many do, but she has not proven herself through the local combination of cold, forage gaps, Varroa pressure, spring timing, disease pressure, and beekeeper management. That is the difference between a queen that is available early and a queen that is locally proven.

Domestic stock may matter more than we used to think

Research comparing imported and domestic queens has shown that queen source can affect performance, although the picture is not simple. One Canadian study compared newly mated imported queens from Hawaii and New Zealand with domestic Canadian queens produced in British Columbia. The researchers found variation in queen morphology and fertility, and field results showed that both environment and queen stock affected colony health and productivity. The same study reported that domestic queens were 25% more likely to survive winter in Alberta than imported queens.

That does not mean every domestic queen is better than every imported queen. It means local and domestic stock deserve serious attention, especially when the goal is overwintering resilience.

For beekeepers, the practical point is this: queen source should be tracked.

A beekeeper should know whether a queen is imported, Canadian-raised, Ontario-raised, overwintered, spring-mated, or home-raised. Then they should record acceptance, brood pattern, temperament, mite levels, honey performance, fall strength, winter survival, and spring buildup. After several seasons, those records become more useful than opinions.

The microbiome may be part of queen resilience

The University of Guelph’s Canadian Bee Gut Project is looking at the microbial side of honey bee health. The project aims to understand how beneficial, harmful, and still-uncultured microbes in bees affect health, disease outcomes, and overwintering survival in Canada. Its goals include nationwide honey bee sampling, baseline microbiome characterization, identifying previously uncharacterized bee-associated microbes, and exploring whether microbial communities or microbial therapies could affect bee behaviour and health.

This matters because the bee gut microbiome is not just background biology. In insects, gut microbes can influence digestion, immune function, pathogen resistance, nutrition, and stress response. For honey bees facing Varroa, viruses, weather stress, nutrition gaps, and winter confinement, microbial health may be one of the missing pieces in understanding why some colonies survive while others do not.

The University of Guelph researchers are now expanding that work to focus specifically on queens, comparing the microbiomes of domestic and imported stock to identify microbial communities associated with successful overwintering in Canada.

That is the part beekeepers should pay attention to.

If certain microbial profiles are consistently associated with stronger queens, better disease resistance, improved reproductive success, or better winter survival, then queen evaluation may eventually include more than brood pattern and field performance. It may include microbial markers of health.

Why queen gut health matters to the whole colony

The queen is not just an egg-laying machine. She is the reproductive centre of the colony. Her health affects worker population, colony growth, brood continuity, pheromone balance, and the colony’s ability to prepare for winter.

Food from Thought, a University of Guelph research initiative, has highlighted work on the queen bee gut microbiome as a way to define what a “healthy” queen microbiome looks like and potentially develop tools to support queen fitness and colony survival. That work is framed as a possible long-term step toward increasing domestic Canadian queen production and reducing dependence on imported queens.

For a beekeeper, this connects directly to what we already see in the yard.

A weak queen may not always look obviously sick. She may simply lag. The brood pattern may be uneven. The colony may build slowly. Supersedure may happen at the wrong time. The colony may enter fall without enough young bees. If microbiome differences are part of that performance gap, then future queen selection may become more scientific and more precise.

This does not mean imported queens are “bad”

It is important not to turn this into a simple imported-versus-local argument.

Imported queens are necessary in the current Canadian system. Without them, many beekeepers would struggle to rebuild after winter losses because local mated queens are not available early enough in sufficient numbers. Imports are part of how the industry keeps operating.

The problem is dependence.

If Canada relies too heavily on imported queens, the industry becomes vulnerable to border disruption, weather events in source regions, transport stress, disease risks, supply-chain delays, and stock that may not be optimally adapted to Canadian overwintering.

The better long-term goal is not to eliminate imports overnight. It is to build a stronger domestic queen system while still using imports where they make practical sense.

A healthy future likely includes:

Imported queens for early spring demand.

More Canadian-raised queens selected for winter survival.

More overwintered nucs from strong local stock.

Better queen-health testing.

Better breeding records.

More research into microbiomes, disease resistance, and overwintering.

More beekeeper-level performance tracking.

What this means for Ontario beekeepers

For Ontario beekeepers, this research has immediate practical value even before the science becomes a commercial tool.

It reinforces that queen source matters. A queen is not interchangeable simply because she is mated. Her genetics, mating quality, microbial health, disease exposure, transport history, and adaptation all affect colony performance.

It also reinforces that overwintering success is not only about insulation or hive wrapping. Winter survival is built from queen quality, mite control, nutrition, population timing, disease pressure, food stores, and moisture management.

A beekeeper buying queens or nucs in Ontario should ask better questions:

Was the queen imported or raised in Canada?

If domestic, was she raised and mated locally?

Was the nuc overwintered or spring-made?

What traits are being selected for?

Does the supplier track winter survival?

How did the parent stock perform last winter?

Has the queen been laying long enough to assess brood pattern?

What support is offered if the queen fails soon after installation?

Those questions matter because a queen’s value is not only whether she arrives alive. Her value is whether she can build and maintain a colony under Ontario conditions.

What beekeepers can do now

The microbiome research is still developing, but beekeepers do not need to wait for a lab report to improve queen decisions.

The practical steps are already clear.

Track queen source. Write down whether queens are imported, domestic, local, overwintered, or home-raised.

Evaluate queens by brood pattern, not just presence. Seeing the queen is useful. Seeing what she produces is better.

Compare colonies in the same yard. If one colony consistently lags behind others under the same conditions, look hard at queen quality, mite pressure, disease, and nutrition.

Do not carry poor queens into fall. A weak queen in August is a winter survival problem.

Support reputable local queen and nuc producers. Especially those who can explain their stock, selection goals, overwintering results, and permits.

Use imported queens strategically. They are valuable when timing demands them, but they should not be the only long-term plan.

Keep winter-survival records. A queen that produces a colony that survives and builds well in spring has proven something useful.

The bigger picture

The Canadian Bee Gut Project is important because it is trying to move beekeeping beyond guesswork. Instead of only asking whether a colony died, researchers are asking what biological differences may explain survival. Instead of treating the microbiome as invisible background, they are studying whether gut microbial communities are part of resilience.

That kind of work could eventually help Canadian beekeepers select stronger queens, reduce colony losses, strengthen domestic queen production, and rely less heavily on imported stock.

For Ontario, where winter survival remains one of the hardest parts of beekeeping, that matters.

A queen is not just a bee in a cage. She carries the future population of the colony. If her genetics, mating, microbial health, and local adaptation are strong, the colony starts with a better foundation. If they are weak, the beekeeper may spend the entire season trying to compensate.

The practical conclusion is straightforward: Canada will still need imported queens in the near term, but the future of resilient beekeeping depends on understanding which queens actually perform here, why they perform, and how to produce more of them domestically.

That is why the University of Guelph’s work on imported queens, domestic stock, microbiomes, and overwintering success is worth watching. It is not abstract science. It is the kind of research that could change how beekeepers choose queens, manage colonies, and build stronger bees for Canadian winters.

Sources:
University of Guelph — “Importing Queen Bees Won’t Solve Canada’s Beekeeping Problems”: https://news.uoguelph.ca/2026/04/importing-queen-bees-wont-solve-canadas-beekeeping-problems-opinion/
Canadian Bee Gut Project — University of Guelph: https://beegutproject.uoguelph.ca/
Food from Thought — “Improving Queen Bee Health to Tackle Pollinator Decline”: https://foodfromthought.ca/student-dylan-brettingham/
Scientific Reports — “Queen quality, performance, and winter survival of imported and domestic honey bee stocks”: https://www.nature.com/articles/s41598-023-44298-x