Varroa Mite Education for New Beekeepers: The 5 Things You Must Know
New beekeepers who learn these 5 concepts before their first season lose 45% fewer colonies in year one. The concepts aren't complex -- varroa management isn't quantum physics. But knowing them before your first hive installation means you're building the right habits from day one rather than learning them after your first winter loss.
Here are the 5 essential varroa education concepts, explained for beekeepers in their first season.
TL;DR
- This guide covers key aspects of varroa mite education for new beekeepers: the 5 things you m
- Mite monitoring should happen at minimum every 3-4 weeks during active season
- The 2% threshold in spring/summer and 1% in fall are standard action points based on HBHC guidelines
- Always run a pre-treatment and post-treatment mite count to calculate efficacy
- Treatment records including product name, EPA number, dates, and counts are required for state inspection compliance
- VarroaVault stores all monitoring and treatment data with automatic threshold comparison and state export formatting
1. What Varroa Is and Why It Kills Colonies
Varroa destructor is a parasitic mite about the size of a sesame seed. It's reddish-brown, oval-shaped, and lives on honey bees by attaching to their bodies and feeding on their fat body tissue. Every managed honey bee colony in the United States has varroa. There are no varroa-free managed colonies in the continental US.
The mite itself is just part of the problem. Varroa also transmits viruses -- particularly deformed wing virus (DWV) -- directly into developing bee pupae. A bee that develops with varroa feeding and virus exposure emerges with a compromised immune system, reduced fat body reserves, and a lifespan that's significantly shorter than a healthy bee.
Why this kills colonies: Colonies don't usually die from mite loads in spring or summer -- they die in winter. The mechanism: in late summer (August-September), the colony produces "winter bees" that are supposed to live 4-6 months and carry the colony through winter. When those winter bees develop under high mite pressure, they live 2-3 months instead. By January, the colony has run out of bees to sustain the cluster. It fails -- not from cold, but from mite-damaged bees that couldn't survive long enough.
What you need to know in year one: Varroa is present in your hive from day one. You need to monitor for it and you need to treat it on a schedule. Ignoring it and hoping for the best produces the 37% annual loss rate that's the US average.
2. How to Monitor for Varroa
You can't manage what you can't measure. Monitoring for varroa means counting mites and expressing the result as a percentage of the bee population.
The method most beekeepers use is the alcohol wash:
- Collect approximately 300 bees (about half a cup) in a jar. Collect from frames in the brood nest area -- frames with capped brood and nurse bees. Forager bees from the entrance carry fewer mites.
- Add isopropyl alcohol (at least 70%) to the jar to cover the bees.
- Shake for 60 seconds.
- Pour the contents through a strainer over a white container. The mites fall through; the bees stay in the strainer.
- Count the mites in the white container.
- Divide by 3 (since you had approximately 300 bees). The result is your mite percentage.
A count of 0.5% means about 1-2 mites per 300 bees. A count of 2% means about 6 mites per 300 bees. A count of 5% means about 15 mites per 300 bees -- that's an emergency.
When to monitor: April (spring baseline), May-June (follow-up), July (mid-season check), and August (before your fall treatment). Post-treatment counts 30-45 days after treatment verify that your treatment worked.
3. When the Treatment Thresholds Apply
Your mite count tells you whether to treat now or continue monitoring. The thresholds:
2% in spring and summer (April-July): At 2%, you should plan treatment in the next 7-30 days depending on the month. July is more urgent than April because you have less time before August.
1% in August: Treat immediately in August regardless of your trend. The August treatment protects the winter bee cohort being raised right now.
3% at any point: Emergency. Treat within 72 hours regardless of honey super status, temperature, or other considerations.
Treat all colonies in August regardless of count: Even a 0.3% count in August warrants treatment. The cost of treating a low-count colony is minimal; the cost of a winter loss is not. Make August 1-15 a fixed date on your calendar every year.
The thresholds aren't perfectly safe lines -- they're action triggers. A colony trending rapidly upward at 1.8% in July will be at 3% by August if you don't intervene.
4. Which Treatments Are Available and How to Choose
There are several EPA-registered varroa treatments. As a new beekeeper, you don't need to master all of them immediately, but you should know the main categories:
Oxalic acid (Api-Bioxal): An organic acid that kills phoretic mites on adult bees. Available as a dribble (most effective on broodless colonies) or vaporization (more flexible). 0-day PHI (no waiting period before harvesting honey). Good for: fall broodless-period treatments, extended protocol for in-season colonies.
Formic acid (MAQS, Formic Pro): An organic acid that kills mites both on adult bees and in capped brood cells. Temperature-limited (below 79-85°F). 0-day PHI, approved for use with supers on. Good for: when you need to treat during active honey flow.
Amitraz (Apivar): A synthetic acaricide in a slow-release strip. Requires supers to be removed. 14-day PHI from strip removal. Very effective (90-97% efficacy). Good for: planned fall treatments, summer dearth treatments.
For your first fall treatment: Apivar is a common starting point for new beekeepers because it's simple to apply, well-documented in efficacy, and widely available. Apply strips between frames of capped brood, leave in 42-56 days, remove and calculate PHI.
5. Why Recording Your Results Matters
Varroa management requires tracking trends, not just single counts. The data you collect in year one becomes your baseline for year two. The data from year two tells you whether your treatment is working and whether any colony is showing resistance signals.
What to record after every count:
- Date
- Hive ID or name
- Counting method
- Number of bees sampled
- Number of mites found
- Calculated percentage
What to record after every treatment:
- Date treatment started
- Product used
- Application method
- Date strips removed (if applicable)
- PHI clearance date
A notebook works. A spreadsheet works better because it can calculate trends and PHI dates automatically. A dedicated app like VarroaVault works best because it handles calculations, sends reminders, and keeps records in a format that satisfies state inspection requirements.
Start recording from your first count. Don't assume you'll remember the numbers -- you won't. The numbers you record in April are the comparison point for your August decision. The August pre-treatment number is the baseline for your September efficacy calculation. The chain of records is what makes management systematic rather than reactive.
The first year beekeeper varroa guide covers year-one management in more detail. The varroa mite software for hobby beekeepers guide covers tool options for new beekeepers.
Frequently Asked Questions
What is varroa and why does it kill bee colonies?
Varroa destructor is a parasitic mite that feeds on bee fat body tissue and transmits viruses during development in capped brood cells. It kills colonies indirectly: the bees raised under high mite pressure in late summer -- the "winter bees" that are supposed to carry the colony through winter -- develop with reduced fat body reserves and suppressed immune function, giving them lifespans of 2-3 months instead of 4-6. By January, the colony runs out of bees to maintain the cluster and fails. The damage was done in August and September; the colony just fails in winter.
How do I monitor for varroa mites?
The most accurate method is an alcohol wash. Collect about 300 bees from brood nest frames in a jar, add isopropyl alcohol, shake for 60 seconds, pour through a strainer into a white container, count the mites, and divide by 3. The result is your infestation percentage. Monitor in April (spring baseline), again in May-June, in July (critical mid-season check), and in August before your fall treatment. Post-treatment counts 30-45 days after treatment verify efficacy.
When and how should I treat for varroa?
Treat any colony above 2% in spring or summer, above 1% in August, and all colonies in August regardless of count. The August treatment is the most critical -- it protects the winter bees being raised in August-September. For your first fall treatment, Apivar (amitraz strips, applied between brood frames for 42-56 days with supers removed) is a reliable starting point. Record your pre-treatment count, the treatment details, your strip removal date, and your post-treatment count 30-45 days later to verify the treatment worked.
How do I know if my varroa treatment is working?
Run a mite count 2-4 weeks after the treatment ends and compare it to your pre-treatment count. The efficacy formula is: ((pre-count - post-count) / pre-count) x 100. A result above 90% indicates effective treatment. Results below 80% should trigger investigation for possible resistance, application error, or reinfestation. Log both counts in VarroaVault to track efficacy trends across treatment cycles.
How often should I check mite levels in my hives?
At minimum, once per month (every 3-4 weeks) during the active season. Increase to every 2 weeks when counts are near threshold or after a treatment to verify it worked. In fall, monitoring frequency matters most because the window to treat before winter bees are raised is narrow. VarroaVault's monitoring reminders can be set to your preferred interval for each apiary.
What records should I keep for varroa management?
Each record should include: date of count or treatment, hive identifier, monitoring method used, number of bees sampled, mites counted, infestation percentage, treatment product name and EPA registration number, dose applied, treatment start and end dates, and PHI end date. State apiarists typically expect this level of detail during inspections. VarroaVault captures all of these fields in a single log entry.
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
The information in this guide is most useful when you have your own mite count data to apply it to. VarroaVault stores every count, flags threshold crossings automatically, and builds the treatment history you need for state inspections and effective management decisions. Start your free trial at varroavault.com.