Why Use a Screened Bottom Board in the Hive?
When beekeepers see signs that the population of Varroa destructor mites are increasing in the hive, they will take action to reduce the mite population. One way they can track mite levels is by using a screened bottom board.
A close monitoring of a screened bottom board can give a beekeeper a good idea of whether or not the mite population is increasing or decreasing in the hive.
Mites fall through the screen to the ground. A screened bottom board stretches across a platform that the hive box sits on.
When the mites in a hive fall on solid bottoms in a hive box, they can ride back up into the interior of the hive on other bees. A great article for building your own screened bottom board can be found at http://www.michiganbees.org/wp-content/uploads/2012/03/Screened-Bottom-Board_20110324.pdf
The use of a screened bottom board prevents bees returning upwards in the hive. One sign of mites at work in a hive are wings missing from newly emerged baby bees. There are other signs as well.
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Put Your Eyes and Nose on Your Hives
As a beekeepeer, I sniff my hives as well as visually examine them for signs of hive health. A healthy hive smells pleasant but an unhealthy one can emit a foul odor.
This time of year, honeybee hives should be checked for populations of mites. Especially destructive is the Varroa destructor mite and the tracheal mite. Mite populations can rapidly increase and decimate a hive.
The Varroa destructor mites are true “blood suckers” and feed on adult bees (especially drones or males) and baby bee larvae.
I inspect for deformed bees (like wings missing), red or brown spots on bee larvae, or pinpoint-size mites (looking like ticks) clinging behind a bee’s head or between its abdominal sections. It’s best to treat immediately when the signs are clear that there’s a problem in the hive. If it smells foul, there could be an infection.
In fact, beekeepers need to stay vigilant for all kinds of illnesses that can harm their hives: mites, bacterial infections, and/or even predators placing hive’s health at risk.
The scent of honey and the hum of bees busily working inside the hives can be reassuring to a beekeeper, but doesn’t eliminate the need for regular inspections, especially in autumn. You want your hives to be healthy enough to make it through whatever conditions winter brings.
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