To ensure the effectiveness of the medication, a screened bottom board must be closed when using treatments that rely on fumigation. Methods such as oxalic acid vapor or formic acid work by filling the hive with a therapeutic gas; if the bottom is open, this gas escapes, rendering the treatment useless.
Fumigation treatments function by creating a specific concentration of vapor within the hive to kill mites. Leaving a screened bottom board open destroys this containment, allowing the medication to dissipate before it can deliver a lethal dose to the parasites.
The Mechanism of Fumigation
Containing the Vapor
Treatments involving oxalic acid vapor or formic acid are fundamentally different from contact strips. They rely on saturating the air within the hive body.
For these treatments to work, the hive must act as a sealed chamber. This ensures the chemical permeates the entire cluster where mites are hiding.
Preventing Leakage
A screened bottom board is designed to increase airflow. During fumigation, this feature becomes a liability.
If the screen is left uncovered, the heavy vapors produced by these treatments will settle and exit through the bottom mesh. This drops the concentration of the treatment below effective levels immediately.
Practical Execution
Creating a Temporary Seal
You must create a solid floor to trap the fumigant inside. This needs to be done only for the duration of the treatment application.
By blocking the mesh, you force the vapor to circulate through the hive boxes rather than venting out.
Recommended Materials
The solution for sealing the bottom board is simple and inexpensive.
A thin piece of poster-board or cardboard is highly effective. Simply insert this material to cover the screened portion completely.
Common Pitfalls to Avoid
Misidentifying the Treatment Type
One of the biggest errors beekeepers make is assuming all treatments require the same ventilation setup.
While some treatments require high airflow, fumigants specifically require a closed system. Always verify the mechanism of action for the specific chemical you are applying.
Incomplete Coverage
Using a material that is too small or gaps in the seal can compromise the treatment.
Ensure the poster-board or cardboard covers the entire surface area of the screen. Even small leaks can significantly reduce the concentration of the vapor.
Making the Right Choice for Your Goal
To maximize the impact of your mite control efforts, follow these guidelines:
- If your primary focus is Oxalic Acid Vapor: You must verify that the hive is sealed tight, including the bottom board, to trap the rapidly expanding gas.
- If your primary focus is Formic Acid: Ensure the screen is blocked with cardboard to maintain the acid concentration necessary to penetrate brood caps.
Sealing the hive bottom is a small step that makes the difference between a wasted effort and a mite-free colony.
Summary Table:
| Treatment Type | Mechanism | Bottom Board Status | Required Materials |
|---|---|---|---|
| Oxalic Acid Vapor | Fumigation | Closed | Poster-board / Cardboard |
| Formic Acid | Vapor Concentration | Closed | Poster-board / Cardboard |
| Contact Strips | Physical Contact | Open/Optional | N/A |
| Essential Oils | Evaporation | Closed/Restricted | Sealant Board |
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