26/09/2026
Be prepared for the unexpected? Is that even possible?
For breeders about to face their first Varroa invasion, this is some advice from the other side of it. We lost more than 200 colonies during our first major Varroa wave, and rebuilding the breeding program afterwards has taught me a few things I wish Iād understood beforehand.
Keep your valuable breeders in nucs where possible. They are easier to monitor, easier to treat and much easier to manage when things start going wrong.
Young, vigorous breeders generally handle treatment better. If you have older or irreplaceable breeders, consider moving them out to an area with no Varroa or very low Varroa pressure while you still have that option. Preserve the genetics first.
When the invasion really gets going, things become incredibly busy, very quickly. Prioritise your breeding stock. It is surprisingly easy to become consumed with trying to save everything while the genetics that took years to develop quietly disappear.
Protect your drone mothers as carefully as your queen mothers. We went from having around 100 drone-mother colonies capable of producing tens of thousands of drones to virtually no drone capacity. Losing that genetic resource can affect the breeding program long after the initial colony losses are over.
Where you have a choice, use the gentlest effective treatments you can and preserve your treatment options for later. High mite pressure combined with repeated treatment is hard on breeding colonies, particularly older queens.
And constantly check that treatments are actually working. Donāt assume a synthetic is effective because it worked previously. Monitor before and after treatment and be alert for resistance or treatment failure. We learnt that lesson the hard way.
Have a Varroa plan for your breeding stock before Varroa arrives. Decide which queens and lines are genuinely irreplaceable, where you could move them, how you will protect them and which genetics need to be duplicated.
If possible, spread that risk ā sister queens, daughters and drone sources in more than one location. The first invasion is not the time to discover that too much of your breeding program exists in one place.
There will also be things you simply didnāt anticipate. Varroa doesnāt just change mite numbers; the effects ripple through colony strength, drones, mating, queens and the following breeding season.
PRACTICAL CHECKLIST
ā Identify your irreplaceable breeders and drone lines.
ā Keep valuable breeders in manageable nucs where possible.
ā Back up important genetics ā daughters, sisters and drone sources ā and spread them across locations if you can.
ā Consider moving older or irreplaceable breeders to a no-Varroa or low-Varroa area before the wave reaches you.
ā Have treatments ready. Use the gentlest effective options you can.
ā Monitor before and after treatment. Never assume a treatment worked, and continually watch for resistance to synthetics.
ā When things get hectic, prioritise your breeding stock.
ā Keep enough records that you still know what survived, what was treated and what genetics you have left.
ā Save some energy for the inevitable rebuild. Surviving the invasion is only the first part.
And expect the plan to change. It probably will.
Good luck, and see you on the other side.