Varroa Management During Pollination Season: Protecting Your Asset
Almond pollination colonies treated within 45 days of placement without PHI clearance risk contract penalties up to $500 per colony. That number frames what's at stake when pollination operators miscalculate their treatment timing. Varroa management during pollination season isn't just about colony health -- it's about contract compliance, liability, and protecting the operational revenue that makes the rest of your season viable.
The core challenge is that pollination season and the varroa management calendar don't naturally align. The almond pollination window runs February through mid-March -- outside the typical active management season, but not outside the varroa season. California almond orchards receive millions of colonies with varying varroa histories, and the stress of transport and intense foraging can accelerate mite population growth on arrival.
TL;DR
- This guide covers key aspects of varroa management during pollination season: protecting your
- 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
The PHI Timing Problem
PHI (pre-harvest interval) for varroa treatments is calculated with respect to honey -- specifically, to honey in supers that you intend to harvest. During a pollination placement, you typically don't have honey supers on. But pollination contracts have their own residue requirements, and growers rightly want confirmation that colonies placed in their orchards haven't been recently treated with synthetic products that could affect residue status.
The practical rule: for almond pollination, major growers specify a 45-day minimum window between any synthetic acaricide treatment and placement in the orchard. Some contracts specify longer windows or additional testing requirements.
This means if your colonies are going into almonds in February, your last synthetic treatment needs to have been completed by early January at the latest. For operations treating in fall (September-October), this usually isn't a problem -- you have 4 months of clearance. For operations that haven't treated since the previous fall or that needed an emergency treatment in late fall, you need to verify your clearance window before accepting a contract.
Organic treatments -- oxalic acid, formic acid, thymol -- generally have 0-day PHI with respect to honey, but individual grower contracts may have additional requirements. Read your contract carefully and confirm with the grower before placement.
Building a Pre-Placement Treatment Protocol
The goal going into pollination placements is colonies that are healthy, strong, and varroa-managed with clearance from any restricted treatments. Here's how to structure your pre-placement protocol:
October-November: Complete fall synthetic treatment (Apivar or formic acid) across all colonies intended for pollination. This gives you the clearance window you need for February placements.
December-January: Post-treatment counts to verify efficacy. If any colonies are still above 2%, you have a problem. You have limited time for a corrective treatment with clearance available before a February placement.
Options for January emergencies: OA dribble on broodless colonies (0-day PHI for honey, check contract requirements). OA vaporization series if brood is present. These give you a treatment option that doesn't create a synthetic residue window.
Pre-placement count (30 days before): Log a count for every colony going to pollination. This documents the mite status at placement, which protects you if there's a dispute later about colony health on arrival.
The pollination placement mode in VarroaVault blocks treatment entries that would violate PHI during active pollination contracts. When you set a placement date in the system, the treatment planner automatically removes any product options that would create a clearance conflict with that placement timeline.
Colony Health Standards for Pollination
Beyond treatment timing, colony health standards for pollination placements focus on population and queen status:
Minimum population: Most commercial pollination contracts specify minimum frame coverage (typically 4+ frames of bees for almonds, 6+ for premium contracts). A varroa-stressed colony going into winter often can't meet these standards by February.
This is why the August fall treatment window connects directly to pollination season performance. Colonies treated effectively in August build stronger winter clusters, maintain better population through winter, and arrive at the pollination yard closer to contract minimums. The fall treatment window isn't just about winter survival -- it's about the asset value of your colonies in February.
Active queen: Colonies with failing queens or queen cells at placement are not suitable for commercial pollination. Varroa stress is a leading cause of queen failure, so high mite loads and poor fall treatment execution often show up as queen problems in early spring.
On-Site Monitoring During Pollination
Monitoring colonies during an active pollination placement is logistically challenging. Colony access may be limited by orchard operations, transportation logistics, and the density of colony placement. But monitoring is still important because:
- Reinfestation risk is extremely high in the orchard environment. Thousands of colonies are present, many from operations with varying management standards.
- Transport stress can accelerate mite reproduction.
- On-site treatment may be restricted by contract.
Discuss monitoring and emergency treatment access with your grower before placement. Most growers allow monitoring visits. Emergency treatment ability depends on the contract -- some prohibit any synthetic treatment during placement; others allow organic treatments with documentation.
VarroaVault's pre-harvest interval tracker manages PHI for all your colonies simultaneously. When you enter a placement date for a specific apiary, the system calculates whether any currently active treatments have clearance issues and flags any planned treatments that would conflict with the placement timeline.
Post-Placement Recovery
After colonies come off pollination, expect some mite load increase from orchard-wide reinfestation exposure. A post-placement count within 2 weeks of hive return is standard practice for well-managed commercial pollination operations.
Log these post-placement counts in VarroaVault and compare them to your pre-placement baseline. If counts are significantly higher than at placement, you may need a corrective treatment before the regular spring season begins.
Frequently Asked Questions
How do I plan varroa treatment around a pollination placement?
Work backward from your placement date. For almond pollination in February, your last synthetic treatment needs to be complete by early January (45-day clearance minimum, per most contracts). If your fall treatment was completed in September-October, you have comfortable clearance. For any colony with a questionable clearance window, OA dribble or vaporization (0-day PHI for honey) can be used closer to placement. Set your placement date in VarroaVault's pollination placement mode, and the treatment planner will block any product selections that would create a clearance conflict.
What PHI rules apply during almond pollination?
PHI with respect to honey production applies to your honey supers -- supers present during pollination aren't typically considered harvest honey, but the residue implications are contract-specific. The more relevant constraint for almond pollination is grower contract requirements, which commonly specify 45+ days since any synthetic acaricide treatment. Organic treatments (OA, formic acid, thymol) have 0-day PHI for honey and are generally acceptable closer to placement dates, but verify with your specific contract. Some organic-certified operations may have additional requirements.
Does VarroaVault manage PHI compliance for pollination season?
Yes. VarroaVault's pollination placement mode allows you to log placement dates for specific apiaries. Once a placement date is set, the treatment planner evaluates any treatment entry against the placement timeline and blocks treatment selections that would create clearance conflicts. The system also generates a pre-placement compliance summary showing the treatment history and clearance status for each colony going to placement -- useful documentation for grower contracts that require treatment history disclosure.
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.