Re: Anyone doing OAV treatments from top of hive?
I've heard of someone vaporizing from the top of the hive. Does anyone do that? What's the technique?
Yes. Put the stuff at the top of the hive rather than the bottom, he he. Okay seriously. I make a box to place all the stuff in. it is about 9 inches deep and takes care of all the burning stuff issues. I have never done it with my "Magic Wand" but have vaporized OA over a tea candle this way.
Is it just as effective as placing vaporizer on bottom board?
Yes. OA coming out the entrance (at the bottom) coupled with the top of the box being glass is know I know it gets all the way through the hive.
What if I made a 3" spacer with a notch for the vaporizer handle and sat it above top deep, sat vaporizer on top bars (with a small sheet of aluminum to protect wood), closed off bottom entrance, etc. etc.
Yep that sounds about like it. except I would go with about 6 inch deep spacers or more. Folded aluminum foil makes a remarkable insulator. I place a tea candle on foil. place a holder for a second tea candle cup over that. place OA in the upper cup and walk away. I can just leave the mess to burn up. I also place a screen around the candle to keep flaming bees from running through the hive. It is all part of how I designed the upper cup holder. So it is like this. Remove outer and inner cover. place a folded piece of aluminum foil on top bars. place tea candle on aluminum foil. Light candle. place upper cup and holder over tea candle with a dose of OA in it. No rush here the candle will burn for an hour. Place top on spacer and leave for 5 minutes. You can return at that point and blow out the candle and let it all cool. note wax is now molten so give it a minute or two. or just let the candle burn up and return at your convenience. I would suggest removing spacer and candle by the end of the day but if you are doing hundreds of these you may not get back much before sundown.
Vaporizing from the top of the hive would be much easier if it would be effective.
Bees fan the dust through the hive. I now call it dust because that is what it is. it is no longer vapor once it is about 1 inch from the hot surface. use of the tea cup will make that obvious. attempt to vaporize more than a two deep dose in this set up will prove it. OA has to remain in contact with teh hot surface of the cup to vaporize. In the event I do need more than a two deep dose I use two candles and holders. at 5 cents each I am not going broke any time soon. Worst part is if you had 100 hives and wanted to treat all of them in one run you might need 20 or so spacers. you can make them from pretty much any trash you find to make them from. They could be cardboard if you add some aluminum foil to the ceiling of it.
Height of OA cup above flame is important so test your design. to high and OA will not vaporize. to low and it puts out the flame. Candle is not reusable OA cup and stand is. But then every candle used provides materials for a new stand. Save them, you may decide to not save used stands. Metal window screen will serve as the screen to keep bees out of flame.
I like to have cups with the dose already in them and just go through hives one after the other. Tip: hold the candle to light it. avoid burnt fingers that way.
Everything gets darker, as it goes to where there is less light. Darrel Tank (5PM drawing instructor)