BH wrote: "ticks on dogs and varroa on bees are similar blood suckers. chemicals work best for both" 

I don't agree with that idea. Ticks on dogs and Varroa on bees are both bloodsuckers but they are not alike. Ticks do not depend on dogs, Varroa does depend on bees. And that is where possible evolution comes in. Demonstrated by Apis cerana.
 
Lennard 		 	   		  
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