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Date: | Mon, 9 Mar 2009 10:02:58 +0000 |
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Hi All
Various people have commented about Freeze killing versus pin killing
for calibrating hygienic behaviour.
Freezing is usually done on a patch of brood that is between 50 mm
diameter and 75 mm diameter, based on the type of tin can or piece of
pipe used to contain the liquid nitrogen.
Apart from the edges of the patch the dead larvae are still sealed.
With pin killing, it is usually performed in rosettes of 7 or 19 cells,
every cell's seal is punctured as is the larva within it.
Surely, as we are looking for information about larva that may be
compromised in some way, but are still in sealed cells, then we should
be favouring the freeze killing. To my mind the mere puncturing of the
capping invalidates pin killing for this purpose.
Liquid nitrogen may frighten some beekeepers, but it is more readily
obtainable than many think and providing due respect is given to it it
is no more dangerous to handle than some other substances used in
beekeeping.
Regards & Best 73s, Dave Cushman, G8MZY
http://melliferabees.net Email: [log in to unmask]
Short FallBack M/c, Build 7.21/2.01
Son of ORAC M/c, Build 5.o1/2.o1
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