Tracking MAQS Treatments: Timing, Temperature Restrictions, and Efficacy
MAQS, or Mite Away Quick Strips, contains formic acid as the active ingredient. It is one of the few registered varroa treatments that can be used with honey supers on the hive, which makes it uniquely valuable during the honey production season. But it is also the most temperature-sensitive and colony-stress-inducing treatment in the common toolkit. If you are not tracking MAQS applications carefully, you are taking unnecessary risks.
What Makes MAQS Different
Most varroa treatments work only on phoretic mites or require broodless conditions for full efficacy. MAQS is exceptional because formic acid vapor penetrates capped brood cells. This means it kills mites in the reproductive phase as well as phoretic mites, making it effective even when the colony has a full brood nest. Applied correctly, MAQS delivers efficacy rates of 90% or higher.
The tradeoff is volatility. Formic acid vaporizes rapidly at warm temperatures, which creates a high-intensity treatment period that can stress queens and in some cases cause brood mortality if hive ventilation is poor or temperatures exceed the upper limit. The same volatility that makes formic acid effective also makes it hazardous to work with. Always wear nitrile or rubber gloves and eye protection when handling MAQS strips.
Temperature Window
The registered temperature window for MAQS is 50 to 85 degrees Fahrenheit. This is the ambient temperature range during the treatment period, not just at time of application.
Below 50 degrees, formic acid does not volatilize adequately and treatment efficacy drops significantly. Above 85 degrees, volatilization is too rapid, which can cause queen loss and brood damage. The upper limit is the more dangerous constraint in practice. On a warm August day, temperatures can exceed 85 degrees even if mornings are cooler.
When tracking a MAQS treatment, log the temperature at time of application and the expected temperature forecast for the seven-day treatment period. A MAQS application that starts at 78 degrees on a day forecasted to reach 90 degrees the following afternoon is a risk. Consider waiting for a cooler window or switching to a different treatment.
Application Protocol
MAQS is sold in packs of two strips. For a standard colony, both strips are placed flat on top of the upper brood box frames with the foil side up, gel side down. The treatment period is seven days. Remove any remaining gel or strip material after seven days.
The entrance must be fully open during treatment to allow formic acid vapor to escape. Full-width open bottom boards with screened bottom inserts removed also help. Restricted ventilation concentrates vapor inside the hive and increases the chance of queen and brood damage.
Do not split or move hives during the treatment period. Physical disruption combined with formic acid stress increases colony losses.
A reduced-rate protocol using one strip per week for two consecutive weeks exists and can reduce stress on colonies during warmer conditions, though this requires twice the labor and a second visit.
What to Track in Your Records
For every MAQS application, record:
- Date strips placed
- Date strips removed or treatment complete
- Ambient temperature at time of application
- Temperature range during treatment period (reference your weather records)
- Colony population assessment at time of application (strong colonies tolerate MAQS better than weak ones)
- Mite count before treatment
- Mite count 10 to 14 days after strips removed
- Queen status check post-treatment (verify queen is present and laying)
The queen status check is important. If you apply MAQS and the queen disappears in the following two weeks, the treatment is the most likely explanation. Document it, requeen, and note it in your treatment records. Repeated queen loss after MAQS in a given yard may indicate that your application temperatures are too warm or that the product is not suitable for your summer conditions.
Calculating Efficacy
Efficacy is calculated the same way as for any varroa treatment: (pre-treatment count minus post-treatment count) divided by pre-treatment count, expressed as a percentage. A pre-treatment count of 4% and a post-treatment count of 0.4% represents 90% efficacy, which is within the expected range for MAQS under good conditions.
Efficacy below 70% after MAQS suggests one of the following: temperatures were outside the optimal range during treatment, ventilation was inadequate, the treatment period was shortened, or the colony had some other issue that limited exposure. Check these variables before concluding you have product failure.
VarroaVault's treatment log captures all of these fields and calculates efficacy automatically when you enter pre- and post-treatment mite counts. The treatment efficacy calculator gives you a consistent way to compare MAQS results across hives and seasons, and helps identify which colonies or conditions are associated with suboptimal outcomes.
MAQS in a Rotation Program
Because MAQS has a different mode of action than amitraz (Apivar) and oxalic acid, it plays an important role in treatment rotation planning to prevent resistance. A common rotation includes Apivar in fall, OAV during the broodless period, and MAQS as a mid-season treatment during honey flow when supers cannot be removed. This cycle keeps selection pressure varied and reduces the risk of any single treatment losing efficacy over time.