Screened Bottom Detector/Protector Board!
To the right is
our new screened bottom board to be used in our 2001 fourfold treatment protocol
experiments with sticky board partially withdrawn. The dimension of the opening
in the bottom is shown with 4" in the front, 1-1/2" on the sides and
1-1/4" in the back of a standard bottom board. We use 1/8" galvanized
hardware cloth to cover the 12"x16" opening. The 1/4" exterior
plywood slide in tray can be used as a sticky board as well as a protector board
during winter. For best results as a detector we suggest using the Phero-Tech
Varroa screen sold by Dadant, or similar material without the plywood insert.
When removing the plywood strip with a sticky board applied causes the Vaseline
mix on the sticky board with mites to become smeared.
Note: Studies in Europe have shown leaving the screen open during winter results in later spring brood rearing and earlier fall brood reduction.
To the left is a bottom view of our screened bottom board with removable Detector/Protector board. The board is 1/4"x12-1/4"x18" and has a small hand hold for removal. We leave the screen open during the active spring, summer and early fall season. The open screen is closed from late September until the following May. Phero-Tech Varroa screens sold by Dadant are used in place of the board to count dropped mites to determine mite infestation during the active brood season
Close-up of Screened Detector/Protector Board!
The view below is a detailed view of the back left corner of our homemade screened bottom board with 2-1/4" side rail and 5/8"x1" rabbeted guide around the screened opening for the Detector/Protector board.
Our experiments over the past five years has shown that using wintergreen in grease patties and in paper towels with canola oil (15% wintergreen) drops Varroa mites from bees in large numbers. We have observed Varroa mites that come into direct contact with the wintergreen treatments perish, those that do not become agitated and disorientated from the unnatural wintergreen vapors and oil carrier which causes them to fall from their host through the 1/8" meshed screened bottom board. They then perish on the sticky board or the ground below. If it were not for the screened bottom board the mites would reattach to the bees when entering or leaving the hive. Another mix to control Tracheal mites and to dislodge Varroa from their host is the Menthol Canola Oil Paper Towel Treatment.
Note: Wintergreen is not a natural compound to the mites in their native environment, so therefore they have not developed any defense mechanism toward this compound.