Sticky boards function as passive, non-invasive diagnostic tools placed at the base of a beehive to monitor parasite loads. By utilizing an adhesive surface positioned beneath a screen bottom board, they capture naturally falling Varroa destructor mites. This mechanism prevents the mites from crawling back into the colony or being carried away by bees, ensuring they remain available for accurate enumeration.
By quantifying the "natural mite drop," sticky boards facilitate the assessment of infestation severity and seasonal population shifts without disrupting the hive's internal structure or stressing the colony.
The Mechanics of Passive Sampling
Strategic Placement
To function effectively, the sticky board is inserted at the very bottom of the hive structure.
It is typically positioned beneath a screen bottom board. This physical separation allows mites to fall through the mesh while preventing the bees from coming into contact with the adhesive.
The Adhesive Barrier
The core function of the board relies on its sticky surface.
Once a mite falls off a host bee, the adhesive traps it immediately. This prevents the parasite from crawling back up into the colony to re-infest a host.
Furthermore, the adhesive prevents house bees from removing the fallen mites, which is a common hygienic behavior that would otherwise skew data.
The Value of Longitudinal Monitoring
Analyzing Natural Mite Drop
Sticky boards are designed for long-term passive sampling.
Rather than taking a snapshot of the population on a single day, they capture the continuous "rain" of mites falling from the cluster. This metric, known as the natural mite drop, serves as a reliable proxy for the total parasite burden within the colony.
Preserving Colony Stability
A critical advantage of this functional approach is the lack of disturbance.
Researchers and beekeepers can slide the board out, count the parasites, and replace it without opening the hive body. This allows for frequent data collection without disrupting the colony's temperature or internal organization.
Tracking Seasonal Trends
By periodically counting the catch, observers can map longitudinal changes.
This continuous stream of data highlights seasonal population trends, allowing for the identification of rapid spikes in infestation levels before they become critical.
Understanding the Trade-offs
Passive vs. Active Assessment
It is important to recognize that sticky boards measure falling mites, not the total population directly.
While this correlates with infestation levels, it is an indirect measurement. It relies on the natural mortality or dislodgement of the mites rather than actively washing mites off a sample of bees.
Requirement for Regular Maintenance
The functionality of the board depends on the adhesive remaining exposed.
Debris from the hive, such as wax cappings or pollen, will also fall onto the board. If not counted and cleaned periodically, the debris can cover the adhesive, rendering the trap ineffective.
Making the Right Choice for Your Goal
When deciding on an assessment method, consider your specific objectives regarding data fidelity and colony health.
- If your primary focus is Colony Health: Use sticky boards to monitor infestation levels without adding stress or disrupting the hive's thermal regulation.
- If your primary focus is Long-Term Research: Rely on this method to generate longitudinal datasets that reveal seasonal population dynamics and infestation trends over time.
Sticky boards provide the essential balance between accurate data collection and minimally invasive hive management.
Summary Table:
| Feature | Function & Purpose |
|---|---|
| Mechanism | Passive trapping of falling mites via adhesive surface |
| Placement | Positioned beneath a screen bottom board to avoid bee contact |
| Primary Metric | Natural mite drop (proxy for total parasite burden) |
| Core Advantage | Non-invasive monitoring; zero hive disruption |
| Best Used For | Longitudinal research and seasonal population tracking |
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References
- Travis L. Dynes, Berry J. Brosi. Assessing virulence of Varroa destructor mites from different honey bee management regimes. DOI: 10.1007/s13592-019-00716-6
This article is also based on technical information from HonestBee Knowledge Base .
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