The primary purpose of the 1/8 inch hardware cloth screen is to create a selective physical barrier between the hive's population and the monitoring equipment. Installed directly above the sticky board, this screen acts as a filter that allows small Varroa mites and debris to fall through while preventing larger honeybees from accessing the area below.
By physically isolating the bees from the adhesive surface, the screen prevents colony injury while ensuring that collected samples consist exclusively of fallen parasites and debris.
The Mechanics of Physical Isolation
A Selective Barrier
The screen functions by exploiting the size difference between the parasite and the host. It divides the hive's floor into a living zone for the bees and a collection zone for assessment.
Facilitating Mite Passage
The 1/8 inch mesh openings are specifically sized to allow Varroa mites to pass through without obstruction. When a mite dislodges from a bee, gravity pulls it through the screen and onto the adhesive surface below.
Ensuring Sample Purity
Because the bees cannot cross the barrier, the material on the sticky board remains uncontaminated by live insects. This isolation ensures the sample is accurate and represents only the fallen parasites intended for counting.
Why Protection is Critical
Preventing Bee Entrapment
The adhesive used on sticky boards is effective enough to trap honeybees. Without the screen, bees walking along the bottom of the hive would inadvertently step into the glue.
Minimizing Colony Stress
Contact with the adhesive can cause significant injury or death to the bees. The screen allows the colony to continue its normal activities undisturbed while the passive monitoring takes place beneath them.
Common Pitfalls to Avoid
Incorrect Mesh Sizing
The 1/8 inch specification is a precise standard, not a suggestion. Using a mesh that is too large creates a risk of smaller bees squeezing through and contacting the adhesive.
Debris Buildup
While the screen is designed to let debris pass, the mesh must remain clear to function. If the screen becomes clogged with wax or propolis, mites may be prevented from falling through to the sticky board, leading to a false low count.
Applying This to Your Hive Setup
To ensure accurate monitoring and colony safety, verify your equipment installation carefully.
- If your primary focus is bee safety: Ensure the screen is installed securely with no gaps around the edges where bees could bypass the mesh.
- If your primary focus is assessment accuracy: Periodically check the 1/8 inch openings to confirm they are clear of obstruction, allowing a free path for falling mites.
The hardware cloth is the critical safety component that transforms a sticky trap into a non-invasive diagnostic tool.
Summary Table:
| Feature | Specification/Function | Benefit to Beekeeper |
|---|---|---|
| Mesh Size | 1/8 Inch | Allows mites to pass while blocking honeybees |
| Primary Role | Physical Isolation | Prevents bee entrapment on adhesive sticky boards |
| Debris Management | Selective Filter | Ensures a pure sample of mites for accurate counting |
| Colony Impact | Passive Monitoring | Minimizes stress and injury to the honeybee population |
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References
- Stephen O Onayemi, Walter S. Sheppard. Elevated CO2 Increases Overwintering Mortality of <i>Varroa destructor</i> (Mesostigmata: Varroidae) in Honey Bee (Hymenoptera: Apidae) Colonies. DOI: 10.1093/jee/toac065
This article is also based on technical information from HonestBee Knowledge Base .