Apivar Strip Application: Step-by-Step for Maximum Efficacy
Most Apivar failures come down to one thing: placement. The strips work, amitraz is one of the most effective miticides available to beekeepers, but they only work if the bees are walking across them. Put them in the wrong spot, and you'll pull strips after 56 days wondering why your mite count barely moved.
This guide covers the correct apivar strip application guide protocol from start to finish: where to place strips, how long to leave them in, and how to verify the treatment actually worked.
TL;DR
- Place Apivar strips in the brood nest between frames, not in the honey super
- Use 1 strip per 5 frames of bees; do not underdose as this accelerates resistance development
- Leave strips in for the full 42 days; removing early reduces efficacy and contributes to resistance
- Remove strips before adding honey supers; check your state's PHI requirements
- Calculate pre- and post-treatment mite counts to verify the treatment worked as expected
- VarroaVault tracks your Apivar application history and flags when efficacy drops below 90%
Why Placement Matters More Than You Think
Apivar works through contact. Bees walk across the strip, pick up amitraz on their bodies, and transfer it through the colony. Mites absorb it during grooming interactions. The whole mechanism depends on traffic.
That's why strips placed in the wrong location, outside the brood nest, against the wall, or in a section of the hive that doesn't get heavy foot traffic, deliver weak results. The active ingredient is there, but the bees aren't.
Where should Apivar strips be placed in the hive? The answer is specific: in the brood nest, between frames with capped brood. That's where bee traffic is highest and where mites are actively reproducing. Strips placed in the brood nest contact zone achieve meaningfully higher mite kill rates than strips placed at the periphery.
What You Need Before You Start
Before opening the hive, have everything ready:
- Apivar strips (2 per colony for most hive configurations)
- Gloves, amitraz can irritate skin
- Hive tool
- Your record-keeping app or notebook
- A pre-treatment mite count from the last 1-2 weeks (critical for efficacy verification later)
Do not start an Apivar treatment without a baseline mite count. You need that number to verify the treatment worked. VarroaVault walks you through the Apivar application checklist and schedules your post-treatment count automatically, so you don't have to remember to do it yourself.
Step-by-Step Apivar Application
Step 1: Confirm the Colony Is Appropriate for Treatment
Apivar is a synthetic acaricide. Before applying, confirm:
- No honey supers are on (Apivar requires super removal before application)
- The colony has an active queen and brood present
- You're outside the honey flow or your pre-harvest interval window allows treatment
If supers are currently on, remove them before applying Apivar. Adding supers after application starts the PHI clock.
Step 2: Open the Hive and Locate the Brood Nest
Find the frames with the heaviest capped brood. In a single-box colony, this is usually the center 4-6 frames. In a two-box setup, the brood nest is typically in the lower box, though in late summer it may span both boxes.
You're looking for the zone with the most capped worker brood, that's where varroa reproduction is concentrated, and that's where you need the strips.
Step 3: Place Strips in the Brood Nest
Use 2 strips per colony in most cases. Position each strip:
- Between frames, not on top of frames
- Hanging down into the space between the brood combs, with the strip touching both adjacent frame faces
- Centered in the brood nest, typically frames 3-4 and 6-7 in a 10-frame box
The strips should be oriented vertically, hanging in the bee space between combs where bees walk constantly.
For two-box colonies, consider placing one strip per box, each in the brood nest of that box.
Step 4: Record the Application
Log the application date, the colony ID, number of strips, and your pre-treatment mite count. This is the data that makes your treatment verifiable. VarroaVault records your OA method alongside efficacy scores so you can see which works better for your operation. The same applies to Apivar logging.
How Long Do Apivar Strips Need to Stay In?
The label requires a minimum of 42 days and a maximum of 56 days. Most beekeepers target 6-8 weeks.
Here's what happens over that window:
- Weeks 1-2: Mite mortality begins. Visible effects on the sticky board.
- Weeks 3-4: Peak efficacy period. Most mites are being killed.
- Weeks 5-6: Continued activity, but slower. The treatment is winding down.
- Week 7+: Efficacy continues to decline. At 56 days, strips must be removed.
Don't leave strips in longer than 56 days. Extended exposure doesn't improve results, it increases the risk of wax contamination and may contribute to resistance development.
Can you check Apivar efficacy before the full treatment period? Yes. A mid-treatment mite count at 3-4 weeks can give you a read on whether the treatment is working. If you haven't seen a notable drop from your baseline, you may have a placement problem or an early resistance signal.
Verifying Efficacy After Treatment
When you remove the strips, do a mite wash within 1-2 weeks. Compare the result to your pre-treatment baseline.
A successful Apivar treatment should achieve 90%+ mite reduction. If you applied 2 strips correctly in the brood nest and ran the full treatment period, a count that's still above 50% of your baseline is worth paying attention to.
VarroaVault's resistance efficacy check triggers if your post-treatment count doesn't drop by at least 90% from baseline. That's your signal to consider rotating treatments and possibly contacting your state apiarist.
What Does a Poor Efficacy Result Mean?
A few possibilities:
- Placement error, strips weren't in the brood nest zone
- Short treatment period, strips pulled before 42 days
- Reinfestation, mites are coming in from neighboring colonies faster than the treatment can kill them
- Emerging resistance, documented in Europe, increasing in US reports
If you get a poor result, document it. Repeat the mite count 2 weeks later. If mites are climbing fast, move to a different treatment class.
Apivar and Resistance Monitoring
Amitraz resistance is real. It was widespread in some European countries before US approval and has been confirmed in isolated US cases. The way resistance develops is through repeated, incomplete treatments, strips not placed correctly, pulled too early, or used every cycle without rotation.
The best way to stay ahead of it:
- Rotate treatment classes. Don't use Apivar every cycle. Alternate with oxalic acid or formic acid treatments.
- Verify efficacy every time. Don't assume a treatment worked without a post-treatment count.
- Log everything. Treatment history helps you spot a declining efficacy trend before it becomes a crisis.
VarroaVault's treatment rotation planner shows you when you last used each treatment class and flags if you're relying too heavily on one active ingredient.
Common Apivar Application Mistakes
Using one strip instead of two. Some beekeepers assume one strip is enough for a small colony. The label recommends two strips for a standard colony. Use two.
Placing strips flat on top bars. Strips need to hang in the bee space between frames. Flat placement on top bars dramatically reduces contact exposure.
Applying with supers on. Don't do it. Remove supers first, treat, then wait the required PHI before replacing supers.
Forgetting the baseline count. Without a pre-treatment count, you have no way to know if the treatment worked.
Pulling strips early. 42 days is the minimum. Less than that and you've potentially run an incomplete treatment that selects for resistance without fully knocking down the mite load.
Where should Apivar strips be placed in the hive?
Between brood frames in the center of the brood nest, with strips hanging vertically in the bee space between adjacent combs. Both strips should be positioned where bee traffic is highest, typically frames 3-4 and 6-7 in a 10-frame box. For two-box colonies, one strip per box in the brood nest zone.
How long do Apivar strips need to stay in?
The label requires a minimum of 42 days and a maximum of 56 days. Target 6-8 weeks for full efficacy. Pulling strips before 42 days creates an incomplete treatment that risks resistance development. Leaving them longer than 56 days increases wax contamination without additional benefit.
Can I check Apivar efficacy before the full treatment period?
Yes. A mid-treatment mite wash at 3-4 weeks gives you a check on whether the treatment is working. You won't see the full kill rate yet, mite counts will still be elevated, but a count considerably above your baseline at week 4 may suggest a placement issue or early resistance. The definitive check is 1-2 weeks after strip removal.
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.
Tracking Your Apivar Treatment in VarroaVault
VarroaVault's Apivar application checklist walks you through each step at the hive: baseline count entry, placement confirmation, start date logging, and automatic scheduling of your post-treatment count reminder. After you remove strips, the app prompts you to log a follow-up count and calculates your efficacy score against the baseline.
If you're managing multiple colonies, the yard view shows which colonies have active Apivar treatments, how many days remain, and which ones are due for strip removal.
For detailed guidance on when to choose Apivar versus other treatment options, see the complete amitraz treatment guide and the treatment efficacy scoring system.
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.