On 1/17/2016 3:06 PM, Gary LaGrange wrote:
> ..... Then over the next weeks we observed whether the drones would appear in other colonies. Within two weeks, we observed drones from every other hive in all 6 hives. Not a very scientific study but perhaps the drone is a culprit in the varroa spread and the spread of other pathogens also......
>   
Every spring, during a course held partly at my home apiary, we mark a 
number of drones in one colony to practise marking.  We have done this 
for 3 seasons so far and I have yet to find a marked drone in another 
colony.  I suspect the trait of drifting is associated with certain 
sub-species.

Steve Rose
North Wales

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