Wooden Varroa Screens and sticky boards function as a synchronized isolation and capture system designed to measure the intensity of a parasite infestation. The screen acts as a selective physical barrier that allows mites to fall through while preventing bees from removing them, and the sticky board serves as the immobilization surface that secures the sample for analysis. Together, they convert the passive natural mortality of mites into accurate, actionable data without disrupting the colony.
Core Takeaway This equipment combination solves the primary challenge of mite monitoring: interference. By physically separating the fallen mites from the hygienic behavior of the bees and securing them against hive airflow, beekeepers can obtain an objective quantification of the colony's parasite load based on natural mortality rates.
The Mechanics of the Monitoring System
The Role of the Wooden Varroa Screen
The wooden screen creates a physical exclusion zone between the active colony and the monitoring area. It is installed directly between the hive body and the bottom board.
The screen features a fine mesh specifically sized to allow dead or dislodged mites to pass through. Crucially, this mesh is too small for worker bees to pass through, preventing them from accessing the bottom board to "clean" or remove the mite debris, which would corrupt the data.
The Role of the Sticky Board
Placed beneath the screen, the sticky board provides the adhesive force necessary for precision. Because hives have constant airflow from ventilation and bee activity, loose mites can easily be blown away or lost.
The sticky surface immobilizes every mite that falls, ensuring they remain in the collection area regardless of wind or vibration. Many industrial-grade boards also feature a black-and-white grid design, which streamlines the visual counting process for the technician.
Why This Method Ensures Accuracy
Objectivity Through Isolation
Without a screen, bees would naturally remove dead mites as part of their grooming behavior. The screen isolates the "drop" from the bees, ensuring that the count reflects the true natural mortality rate rather than the colony's hygienic efficiency.
Preventing Re-infestation
While primarily a monitoring tool, this setup also mimics mechanical control principles. Mites that fall naturally—due to bee grooming or death—are trapped below the mesh, preventing them from crawling back up to re-infest the brood or adult bees.
Non-Destructive Assessment
This method allows for continuous data collection without invasive inspections. Because the internal hive structure is not disturbed, the colony’s stress levels remain low, and normal behavior continues uninterrupted during the sampling period.
Understanding the Limitations
Natural Drop vs. Total Population
It is vital to understand that this method measures natural drop, not the total population. A low drop rate usually indicates a low population, but it can vary based on the season and the amount of brood present.
Mechanical Control vs. Monitoring
While screened bottom boards can be used solely for mechanical control (letting mites fall to the ground), this does not provide data. For monitoring, the sticky board is mandatory to capture the evidence that would otherwise be lost to the environment.
Making the Right Choice for Your Goal
To effectively utilize this system, select your approach based on your immediate data needs:
- If your primary focus is Establishing a Baseline: Deploy the screen and sticky board for a set 24-hour period to calculate the daily natural mite fall rate before applying any treatments.
- If your primary focus is Evaluating Treatment Efficacy: Leave the board in place during treatment application to capture the induced mite drop, using the grid to manage high counts accurately.
- If your primary focus is Long-Term Hygiene: Use the screened bottom board year-round to passively reduce mite loads, inserting the sticky board only when you need to take a count.
The most effective management decisions are made when you stop guessing at infestation levels and start counting the physical evidence.
Summary Table:
| Component | Primary Function | Key Benefit |
|---|---|---|
| Wooden Varroa Screen | Physical Exclusion Zone | Prevents bees from removing mite debris, ensuring data integrity. |
| Sticky Board | Adhesive Immobilization | Traps fallen mites to prevent re-infestation and loss via airflow. |
| Grid Design | Visual Organization | Streamlines the counting process for faster, more accurate analysis. |
| System Synergy | Natural Drop Monitoring | Provides an objective quantification of infestation without hive stress. |
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References
- Thomas D. Seeley, Michael L. Smith. Crowding honeybee colonies in apiaries can increase their vulnerability to the deadly ectoparasite Varroa destructor. DOI: 10.1007/s13592-015-0361-2
This article is also based on technical information from HonestBee Knowledge Base .
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