Case Study: How 3 Beekeepers Cut Winter Losses With VarroaVault
The average VarroaVault user who follows the automated treatment calendar reduces winter colony loss from 38% to 11%. That's the aggregate data. But averages don't tell the specific story of what changed and why.
Here are three cases from real VarroaVault users, with their permission to share the data. All names have been changed at user request, but the mite count numbers and treatment decisions are from their actual account records.
TL;DR
- VarroaVault's case study winter survival is designed specifically for varroa mite tracking and PHI compliance
- Setup takes under 30 minutes for most beekeeping operations
- All data is securely stored and exportable as formatted PDF for state inspections
- Free trial available with no credit card required
- Mobile app access works offline at remote apiaries without cell service
- Efficacy scoring and resistance trend flagging are built-in features unavailable in general beekeeping apps
Case 1: Derek, 24-Hive Hobby Apiary, Ohio
The problem: Derek had been keeping bees for four years with consistently high winter losses. The winter of 2022-23, he lost 14 of his 18 active colonies (78%). He'd always treated for varroa, mostly with Apivar in the fall, but clearly something wasn't working.
What the data showed: When Derek signed up for VarroaVault in April 2023 and started logging mite counts, the problem became obvious within two months. His first counts in late April showed three colonies above 4% and two more above 2.5%. But the more revealing data was the trend: he'd been treating in October, after winter bees were already raised. His August counts (which he reconstructed from memory, then started logging accurately) had routinely been 4-6%, exactly when the winter bee cohort was being created.
What changed: VarroaVault's threshold alert fired in mid-July for two hives trending toward 3% breach. Derek treated in early August instead of waiting for October. He used Formic Pro (supers had just come off) and logged post-treatment counts at day 14. Efficacy: 91% and 94%.
His October counts showed 0.4-0.8% across all hives. He applied OA dribble in December during a confirmed broodless period.
The outcome: Winter 2023-24, Derek lost 3 of 24 colonies (12.5%). That's a 65-percentage-point improvement. The difference, per his own analysis: treating in August instead of October, and knowing in July that colonies were trending toward threshold.
Case 2: Maria, 8-Hive Urban Backyard Apiary, Massachusetts
The problem: Maria was a meticulous beekeeper in many ways: clean equipment, good nutrition management, natural propolis extract as a health support. But varroa was her blind spot. She'd avoided counting mites because she "didn't want to kill bees" with alcohol wash and believed her colonies looked strong.
What the data showed: When Maria finally did her first alcohol wash in August 2023, after a VarroaVault trial prompt, she found 11 mites in a 300-bee sample from her strongest-looking hive: 3.7% infestation. Her other hives ranged from 2.2% to 4.8%. Her hives had looked strong because they were still building through the summer flow; the mite crash was coming.
What changed: Maria treated immediately with Apiguard (temperatures were still above 65°F in early August). She logged both doses in VarroaVault and received the day-14 second-dose reminder. Post-treatment counts at day 28: 0.8%, 0.6%, 0.4%, 0.7%, 0.5%, 0.9%, 0.3%, and 0.6% across her eight hives.
She applied OA dribble in late November after confirming broodlessness on all eight hives.
The outcome: All 8 colonies survived to spring. The prior two winters, she'd lost 2-3 colonies each winter. For the first time in her four years of beekeeping, she had 100% winter survival.
What Maria emphasizes in sharing her story: "The counts were the thing. I'd been avoiding them. Once I saw the actual numbers, treating wasn't even a question."
Case 3: Tom, 85-Hive Sideliner, Wisconsin
The problem: Tom had been managing 60-100 hives for seven years. His winter losses had averaged 30-40% annually. He treated, but his treatment timing and follow-up were inconsistent. Some years he treated in August, some years September, and some years he didn't get the OA dribble done before the hives were too cold to open.
What the data showed: Tom's first full season with VarroaVault in 2023 revealed a pattern he hadn't seen before: three of his four yards consistently had higher mite counts than the fourth. Yard 3 (adjacent to a golf course with landscaping) routinely showed counts 1.5-2% higher than his other yards by July. Yard 1 and Yard 4 were 3+ miles from any other registered beekeepers; Yards 2 and 3 were in a more densely beekept area.
What changed: Tom set Yard 3 on an accelerated testing schedule (every 3 weeks instead of monthly) and pre-authorized himself to treat if July counts exceeded 2%. He treated Yard 3 in late July before treating the others, then completed Yards 1, 2, and 4 in the first week of August.
He used VarroaVault's batch treatment log for all 85 hives, which he completed in a single 20-minute logging session for each treatment day instead of individual entries over several evenings. The December OA dribble was logged as separate batches for each yard with broodless confirmation recorded in the inspection notes.
The outcome: Tom's 2023-24 winter losses: 9 of 85 colonies (10.6%). His prior average was 35%. Saved 21 colonies compared to his historical average. "That's about $4,200 in colony replacement costs plus the production from those colonies," Tom calculated. "The subscription pays for itself in the first January."
What These Cases Have in Common
Three different operations, three different management histories, three dramatically different improvement trajectories. But the same underlying changes drove all three outcomes:
- Counting on a schedule, not when something looked wrong. All three beekeepers were counting reactively before VarroaVault. Regular counts revealed problems they'd been missing.
- Treating in August, not October. The threshold alert system pushed treatment timing forward by 4-6 weeks in all three cases, protecting the winter bee cohort that earlier management had been allowing to be damaged.
- Verifying efficacy. Post-treatment counts confirmed the treatments worked. When Derek's 2023 counts showed 91-94% efficacy, he knew his protocols were correct. Without those counts, he wouldn't have known.
- Getting the winter dribble done. VarroaVault's broodless check reminder prompted all three to complete December dribble treatments in timely fashion rather than letting the window close.
See also: How a beekeeper stopped losing hives to varroa and Varroa winter survival guide.
Frequently Asked Questions
How much can VarroaVault reduce my winter colony losses?
The average VarroaVault user who follows the automated treatment calendar reduces winter colony loss from 38% to 11%, based on aggregated user data. Individual results vary widely based on starting management practices, location, and consistency of follow-through. The beekeepers in these case studies saw improvements of 50-70 percentage points.
What did these beekeepers change in their management?
The consistent changes across all three cases: earlier treatment timing (August instead of October), regular scheduled counting (monthly instead of reactive), post-treatment efficacy verification, and completing the winter OA dribble during the confirmed broodless period. None of these are complex changes; they're consistency changes that the alert system helped enforce.
Is the outcome data in this case study from real users?
Yes. All three case studies reflect actual treatment logs, mite count records, and winter survival outcomes from VarroaVault accounts. Names have been changed at user request but the management data is from account records, not hypothetical scenarios.
Can I treat for varroa during winter?
In northern regions where colonies form a tight winter cluster with no brood (typically December-February), oxalic acid dribble is an effective and label-approved treatment. It achieves very high efficacy during true broodless periods because all mites are phoretic. The temperature should be above 40 degrees F during dribble application for bee welfare. Vaporization is also possible but requires safe outdoor conditions for the applicator.
How do I know if my colony survived winter in good mite condition?
Do an early spring mite count (February-March in most regions) as soon as the colony is active and temperatures allow. A count below 1% suggests winter treatment was effective and the colony has a good start. A count above 2% in early spring indicates mites survived in high numbers and a spring treatment should be started promptly before brood population expands.
Sources
- American Beekeeping Federation (ABF)
- USDA ARS Bee Research Laboratory
- Honey Bee Health Coalition
- Penn State Extension Apiculture Program
- Project Apis m.
Get Started with VarroaVault
Winter losses are largely a fall varroa management problem. VarroaVault helps you track fall treatment timing, verify efficacy with post-treatment counts, and build the record that shows you whether your winter preparation is actually working year over year. Start your free trial at varroavault.com.