American Bee Journal Vol 149 No. 6Yes please, lets have the source.
June 2009
Survivor Stock -A Protocol for Small-Scale Beekeepers by M.E.A.McNeil.
As you can see from the 2009 date it's quite some time since I first read the article but it's still the only reference I can think of which mentions heating the sugar for best effect.Cobey says it is critical to monitor colony levels, use marginal controls when needed and re-queen susceptible colonies. The mites are allies in the process since the bees need the exposure to develop resistance.
Although she would like to see a more thorough protocol worked out, she offered the following suggestions:
......Use powdered sugar weekly all season. To be most effective, powdered sugar requires heating, which is not practical in the field-but it can be used in management, such as shaking bees or setting up new colonies.
edit, 22/03/2013: In the interests of clarity, I've today received confirmation from Susan Cobey that she would never suggest the warming of the sugar.
The wording of the article suggests that she's said something when she hasn't.
Her actual point is that when shaking for packages etc the bees can be treated by placing them in a container with powdered sugar; the heat generated by the bees in the box can help to increase mite fall...caveat regarding ease of overheating/mortality of bees etc
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