Tracking Pre-Harvest Intervals for Honey Production After Varroa Treatments
Pre-harvest intervals (PHI) are the legally mandated waiting periods between the removal of a varroa treatment and the placement of honey supers for harvest. Violating these intervals risks contaminating your honey with chemical residues, which is a food safety issue and a potential label violation with serious legal consequences. For beekeepers selling honey commercially, PHI compliance is non-negotiable.
What Each Treatment Requires
Each registered varroa treatment has its own PHI. These are specified on the product label, which is a legally binding document. Using the product in any way not consistent with the label is illegal. The intervals below are based on current US registrations and may change. Always verify against the current label before use.
Apivar (amitraz): Honey supers must not be on the hive at any time during the treatment period. Strips must be completely removed before supers are placed for harvest. There is no fixed PHI in days after strip removal, but the product must never be present in the hive while harvestable honey is being produced.
MAQS (formic acid): MAQS has the significant advantage of being approved for use with honey supers on the hive. However, it should not be applied within the 72-hour window immediately before you intend to harvest. Supers placed during or after MAQS treatment can be harvested. Always read the current label for updated guidance.
Apiguard (thymol gel): Honey supers must not be present during treatment. Apiguard is a fall treatment applied after the last super comes off, and supers should not be added until treatment is complete.
Api Life Var (thymol wafers): Similar to Apiguard. No supers during treatment. Remove all material before replacing supers.
Hopguard II (beta acids): Strips must be removed before honey supers are added. Follow current label for timing.
Oxalic acid (OAV): Oxalic acid occurs naturally in honey. Oxalic acid vaporization is approved for use with supers on in some formulations, but local regulations and label language vary. Confirm current label status before applying with supers in place.
Why PHI Tracking Fails Without a System
In the field, pre-harvest interval management is easy to lose track of. You might apply Apivar strips in late August, intend to remove them in October, but get busy and leave them in a few extra weeks. The strips come out in early November. You plan to put supers on in April. That seems like plenty of time. But if you did not record the strip removal date, you are working from memory. Memory of treatment dates from months ago is unreliable.
The more common failure is a beekeeper who applies Apivar in August, removes strips in October, and then gets a warm spell in November or December that triggers a quick nectar flow. Excited to capture the flow, supers go on. Strip removal date was October 15. Was that actually before supers went on? Only the records know for sure.
A second common failure occurs when multiple people manage hives on the same account. One person applies treatment in a yard. Another person sees the yard looks ready for supers and adds them without checking whether treatment is still active or when strips were removed.
How to Track PHI Effectively
A PHI tracker works by recording the treatment end date for each hive or yard and calculating the earliest allowable date for honey super placement. Every treatment event logged should generate an automatic note about when supers can go back on.
With Apivar, the relevant date is strip removal date. With MAQS, the relevant date is treatment completion. With thymol products, the relevant date is when the last dose is removed. The system should enforce a visible hold on honey super placement until the appropriate date has passed.
VarroaVault's treatment log captures removal dates and product type, and flags hives where the PHI has not yet cleared. The treatment calendar builder integrates PHI dates into your seasonal planning so honey production timing and treatment timing are managed as a single coordinated schedule rather than two separate mental tracks.
For Multi-Apiary Operations
Managing PHI across multiple yards is where individual memory becomes completely inadequate. A yard treated on September 1 and a yard treated on October 3 have different clearance dates. If you are also running MAQS in some yards but Apivar in others, the rules are different. A systematic record that shows the PHI status of every yard at a glance is the only reliable way to manage this at scale.
The cost of a PHI violation in terms of honey recalls, potential fines, and reputational damage to your business is far higher than the modest investment in a tracking system that prevents it from happening.