The integration of a sticky bottom board with an 8-mesh metal net provides the mechanical isolation necessary for accurate parasite quantification. The adhesive surface traps falling Varroa mites to prevent sample loss from wind or vibration, while the 8-mesh net acts as a selective barrier that allows mites to pass through but physically prevents honeybees from accessing the adhesive or removing the collected mite carcasses.
Core Takeaway Accurate pest monitoring requires eliminating biological and environmental interference. This dual-component system ensures that the mite count reflects true mortality—whether natural or chemically induced—by preventing the bees’ hygienic behavior from altering the data.
The Mechanics of Isolation
The Function of the 8-Mesh Barrier
The "8-mesh" specification refers to a metal grid with openings sized perfectly for this application (approximately 3mm).
This aperture is large enough to allow dead or dislodged Varroa mites to fall through freely. Simultaneously, it is small enough to serve as a hard physical ceiling for the honeybees, preventing them from entering the collection zone.
Eliminating Hygienic Interference
Honeybees possess a natural hygienic instinct to clean their hive, which includes removing debris and carcasses.
Without the protective mesh, worker bees would access the bottom board and physically remove dead mites before they could be counted. The mesh ensures the data remains pristine by segregating the "counting zone" from the colony's active living space.
Preventing Colony Harm
The collection board relies on strong adhesives, such as petroleum jelly or specialized cooking sprays, to function.
The metal net prevents the bees from accidentally landing on or walking across this sticky surface. This protects the bees from becoming trapped or coated in adhesive, ensuring the monitoring process does not disrupt normal colony behavior.
The Role of the Adhesive Surface
Immobilizing the Sample
Gravity alone is insufficient for accurate data collection in an active apiary.
The sticky coating "fixes" the mites in place the moment they land. This prevents the lightweight samples from being blown away by wind drafts or shifted by the vibrations of the hive above.
Capturing Live Drop
Not all mites that fall from the bees are dead; some may be merely dislodged or stunned.
If the board were not sticky, these live mites could crawl away or attempt to climb back into the hive. The adhesive ensures that every mite that passes through the mesh remains on the board for the final count.
Trade-offs and Considerations
Debris Accumulation
The mesh allows more than just mites to pass through; hive debris, pollen, and wax cappings will also accumulate on the sticky board.
High levels of debris can obscure the mites, making counting difficult and time-consuming. This necessitates frequent board changes or careful inspection techniques to distinguish mites from general hive waste.
Passive vs. Active Monitoring
This system measures "mite drop," which is a proxy for total infestation, not a direct count of the total population.
While it is excellent for trending and assessing chemical efficacy, beekeepers must understand that a low drop count does not strictly guarantee a low total population, specifically in the absence of treatment.
Making the Right Choice for Your Goal
To utilize this equipment effectively, align your usage with your specific management objective:
- If your primary focus is Natural Infestation Monitoring: Leave the board in place for three days and divide the total count by three to calculate the average daily mite drop.
- If your primary focus is Treatment Efficacy: Insert the board immediately after applying a chemical agent to quantify the "knockdown" rate and verify the chemical is working.
- If your primary focus is Biosecurity: Use the board periodically throughout the season to detect sudden spikes in pest pressure without the invasiveness of opening the brood box.
By isolating the sample from the cleaners (the bees) and the environment, you transform a simple sticky sheet into a precision instrument for quantitative biological assessment.
Summary Table:
| Component | Feature Specification | Primary Function |
|---|---|---|
| Metal Mesh | 8-mesh (approx. 3mm aperture) | Blocks bee access while allowing mites to pass through. |
| Sticky Board | Adhesive coating (e.g., petroleum jelly) | Immobilizes fallen mites and prevents loss from wind/vibration. |
| System Goal | Mechanical Isolation | Eliminates hygienic behavior interference for accurate counting. |
| Monitoring Type | Passive or Active | Measures natural drop or treatment 'knockdown' efficacy. |
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References
- A. M. Abdel Samed, R. F. Mohamed. EVALUATION OF ACTIVITY OF SOME THYMOL-BASED FORMULATIONS FOR CONTROLLING HONEY BEE VARROOSIS.. DOI: 10.21608/jssae.2007.201122
This article is also based on technical information from HonestBee Knowledge Base .
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