I've gotten several replys to my question which were informative but
nobody that had actually had experiance with a mite resistant bee
strain.Again I can only assume tis mites killing my swarms,I have'nt had
any tests run since its such a hassle.But the facts are:I had no problems
for 2 years,all colonies thrived & wintered well.The last 2 winters,all
colonies were dead by shortly after X-mas.Starvation is out since all
hives had ample stores.In every hive bees were still mostly in clusters
on full combs & simply dead.If anyone has other theories on cause of
death I'm all ears. Of course being a bee-keeper, I will order several
more swarms & have at it again.Thanks for your help,
                                Mike
"I take my chances,I don't mind working without a net,                           I take my chances,I take my chances every chance I get"                                   Mary Chapin Carpenter