A silly millimeter - beekeeping and Varroa mites
Seems that the size of the cell in the comb is really important.
From Michael Bush at the
Bush Farms website:
Most of us beekeepers spend a lot of effort fighting with the Varroa mites. I'm happy to say my biggest problems in beekeeping now are things like trying to get nucs through the winter here in Southeastern Nebraska and coming up with hives that won't hurt my back from lifting or better ways to feed the bees.
This change in beekeeping from fighting the mites is mostly because I've gone to natural sized cells. In case you weren't aware, and I wasn't for a long time, the foundation in common usage by beekeepers results in much larger bees than what you would find in a natural hive. I've measured sections of natural worker brood comb that are 4.6mm in diameter. This 4.6mm comb was drawn by a hive of commercial Carniolans and this 4.7mm comb was drawn on the first try by a package of commercial Carniolans. What most beekeepers use for worker brood is foundation that is 5.4mm in diameter. If you translate that into three dimensions, instead of one, that produces a bee that is about half again as large as is natural. By letting the bees build natural sized cells, I have virtually eliminated my Varroa and Tracheal mite problems. One cause of this is shorter capping times by one day and shorter post capping times by one day. This means less Varroa get into the cells and less Varroa reproduce in the cells. I have mostly done this either with wax coated PermaComb (fully drawn plastic comb) or self drawn comb on foundationless frames or frames with blank starter strips. 4.9mm foundation is available from Dadant and Sons and from Brushy Mt. This size(4.9mm) has been found sufficient to resolve the mite problems.
More information here:
Four Simple Steps to Healthier Bees
Dee Lusby's POV on Beesource
Natural Cell Size
Organicbeekeepers Yahoo group
Curious that such a simple change can have such a great effect...
Posted by DaveH at June 13, 2009 1:55 PM