Varroa Management for a 20-Hive Beekeeper: Scaling Up Your Program

Beekeepers who expand from 10 to 20 hives without upgrading their record-keeping system report a doubling of missed treatment events. That statistic captures the core challenge of scaling up: what works informally at 5 or 10 hives breaks down at 20. The system that carried you through your first years needs to be replaced with something more deliberate.

Twenty hives is the scale where individual hive tracking becomes important, batch treatment planning becomes necessary, and the risk of losing track of any single colony's status becomes real. This guide covers the systems that work at this scale.

TL;DR

• This guide covers key aspects of varroa management for a 20-hive beekeeper: scaling up your p
• 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

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What Changes at 20 Hives

At 5 hives, you can keep the status of every colony in your head. At 10, you're pushing it. At 20, you need a system.

The specific challenges that emerge at 20 hives:

Remembering who you've treated. When you're treating 20 hives over a two-day treatment event, it's genuinely easy to lose track of which hives received strips yesterday versus today, or which ones you couldn't access because of a full super stack that needed to come off first. Without a log, you'll find yourself uncertain about whether Colony 14 got treated.

Individual hive mite histories. At 20 hives, some colonies will consistently run higher mite loads than others. Identifying those "hot" hives requires count history per colony, not just an apiary-level average. Hives with consistently high counts need closer monitoring, possibly different treatment timing, or requeening.

Treatment scheduling across multiple locations. If your 20 hives are split between two or three locations, you need to manage treatment windows and PHI planning per location rather than as a single unit. A honey flow at one location may mean you can't treat there while another location without a flow is wide open.

Batch treatment logistics. Treating 20 hives individually on 20 separate days isn't realistic. You need to plan treatment days by apiary, ensure you have adequate supplies on hand, and schedule post-treatment counts for the right time window after each batch.

The 20-Hive Record System

The minimum record system for a 20-hive operation has three components: a hive inventory, a count log, and a treatment log.

Hive inventory. Each of your 20 hives needs a unique ID that follows it through the season. A simple numbering system (Hive 1-20, or Apiary A: 1-12 and Apiary B: 1-8) works fine. The ID links everything else together -- counts, treatments, queen events, and winter outcomes.

Count log. Every count entry includes: date, hive ID, method, sample size, mite count, and calculated percentage. When you log 20 counts in a session, you want to be able to see at a glance which hives were above threshold, which were borderline, and which were clean.

Treatment log. Every treatment entry includes: date, hive ID, product, EPA registration number, dose, and reason for treatment. At 20 hives, treatment records also become important for PHI tracking across hives that may have different honey super timelines.

VarroaVault's 20-hive mode enables apiary-level treatment scheduling and batch count entry for efficiency. You can log a batch treatment in one session by selecting multiple hive IDs and applying the same treatment record to all of them simultaneously.

Apiary-Level vs. Individual Hive Monitoring

At 20 hives, you have a choice: monitor every hive individually every month, or use an apiary-level sampling approach and monitor individual hives less frequently.

The practical answer depends on your setup. If all 20 hives are at the same location, individual monthly monitoring is feasible -- it's roughly 30-40 minutes of count work per session, or 3-4 hours per season. That's entirely manageable.

If your 20 hives are split across three locations, you're doing multiple driving trips for monitoring. In that case, an apiary-level approach makes more sense: test 4-5 hives per location each month (25%), rotate which hives you test, and ensure each hive gets individually counted at least 3 times per season.

The varroa management for small commercial operations guide covers the statistical basis for sampling frequency at different hive counts.

Identifying Your Hot Hives

With two or more seasons of individual count data in VarroaVault, you can identify which hives in your 20-hive operation consistently run higher mite loads than the others. This is valuable information.

Consistently high-mite hives are often poor candidates for queen right management. They may benefit from requeening with a higher-hygienic-behavior line, or they may indicate a location issue (close to other colony drift paths, near a neighbor's hive). At 20 hives, you can afford to manage these outliers differently without the approach being practical.

Treatment Day Logistics at 20 Hives

Plan your treatment days like production events. For 20 hives across two locations on a fall Apivar treatment:

• Order strips 3-4 weeks in advance. For 20 hives at 2 strips per colony, you need 40 strips.
• Block two half-days for treatment: one per location.
• Bring a checklist of hive IDs for each location to check off as you go.
• Log treatments in VarroaVault as you complete each hive, not at the end of the day.

The commercial beekeeper management software features in VarroaVault's Professional plan are designed for operations from 20 hives upward. The batch logging system, apiary-level scheduling, and treatment day checklists are all available at this scale.

Planning Your First Full 20-Hive Season

The annual program for 20 hives follows the same calendar as 5 hives, but with added batch planning:

March: Order all treatment supplies for the year. At 20 hives, your treatment budget is around $80-120 for a year of Apivar and OA materials.

April: Individual counts on all 20 hives, or representative sample of 5-6 per location. Log baselines.

June: Full counts on all hives, or 30% sample. Flag any hives above 2%.

July: Full counts. This is your emergency detection month. Any hive above 3% needs immediate attention.

August 1-15: Batch treatment at each location. Two treatment days for two locations.

September: Post-treatment counts. Full apiary sampling to verify efficacy.

October/November: Broodless period OA dribble if confirmed.

Frequently Asked Questions

What systems do I need for varroa management at 20 hives?

You need three things: a hive inventory with unique IDs for all 20 colonies, a count log that records every monitoring result by hive ID, and a treatment log with all required fields (date, product, EPA number, dose, hive IDs). Beyond that, you need batch treatment planning -- the ability to schedule treatment days by apiary and track which hives were treated in each session. VarroaVault's 20-hive setup handles all of this, with batch count entry and treatment logging that lets you record a full apiary session efficiently.

How does varroa management change when I go from 10 to 20 hives?

The biology and thresholds don't change -- it's still 2% in season, 1% in August. What changes is the logistics and the record-keeping. At 20 hives, individual hive history becomes important for identifying outliers; batch treatment planning replaces ad hoc individual treatments; and the risk of losing track of who got treated becomes real enough to require a reliable logging system. The transition from "I remember what I did" to "my records show what I did" is the key management upgrade at 20 hives.

Does VarroaVault scale from 10 to 20 hives easily?

Yes. Adding hives to your VarroaVault account is straightforward -- there's no configuration required beyond entering the new hive IDs and their apiary location. If you have historical data from your 10-hive operation, it remains in the account, and the trend graphs and annual summaries include both old and new hives. The batch logging features activate once you have multiple hives at the same location, making treatment day and monitoring session entry significantly faster than individual hive-by-hive logging.

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.