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May I pass my method for using PDCB for your consideration. I put the crystals in a small jar, I use the Colman's square mustard = jar, and put the lid on. I pierce about five holes in the lid with a = very small nail. I put this jar in the top box of a stack of boxes = with frames with a flat board underneath and on top. Very little pdcb = is lost and the jar should last for years. The vapour pressure of pdcb = is so high that a sufficiently high level is produced but does not = produce the persistant smell that open crystals do. I suspect that the = persistant smell is due to sublimation onto the combs and with the lower = level of vapour I use this does not happen. On opening the stack there = is a discernable smell of pdcb but this soon disappears. "Bob Saxton" Sent: Wednesday, May 26, 2004 10:56 AM Subject: Re: Use of PDCB crystals > > Hi Bob > > Could you quantify the jar volume and the hole size in the lid? > > I like the approach and it would be sensible to include it as an update on > one of my pages (with your permission and acknowledgement) may I pass on for your consideration my method for using PDCB crystals = to prevent wax moth. I put the crystals in a small jar, I use the square Colman's mustard = jar, and put the lid on. I pierce the lid with five holes using a very = small nail. I put this jar in the top box of a stack in the space left = by removing two or three frames. I put a flat board underneath and on = top of the stack. I do not seal the stack with tape but I do put some = weight on it. =20 On opening the stack there is a discernable odour of PDCB but this soon = clears. =20 I suspect that the persistant odour caused by using open crystals is due = to sublimation onto the frames and boxes. Using my method the = saturation vapour pressure is not reached so this does not happen. The = method is very economic in PDCB and time, as the crystals in the jar = last for years but sufficient vapour is produced for moth control. The jar I have in use is a Colmans Mustard jar about 5.5cms square and the height of the original contents about 5.5cms. It has a screw on metal lid. Any similar small jar would be suitable. The holes are about 1.5mm across and could be conveniently be made with a 1 1/2" hive pin. I use 5 holes but this could be increased or decreased to accommodate the size of your stack. Mine was 5 National deeps. I hope that this is useful to you and you are most welcome to use the information in any way that you wish.

Originated... ?? MM 2004, Revised... dd mm 2004,
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