Hi Bob,
Yes, coumaphos causes Intermediate Caste Syndrome - a search of the Bee-l archives should pull what has been said in the past about it on this list.  This condition was first recognized , named and decribed by D. Micheletto and myself in The Beekeepers Quartely which is published in the UK.  Coumaphos cause intermediates to develop and these may live for many months in different hives - upsetting the whole queen cell raising process either by the production of small amounts of queen pheremone so that the colony is queenless but not really.  They will enter queenless hives and destroy or cause the bees to destroy any cells in the hive.  
Checkmite+ was used and label directions were followed with the exception that only one strip/hive was used instead of two.  It will take a minimum of six years for the situation to return to what it was pre-coumaphos use.
Best regards
Roger
Cyprus.

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
-- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and  other info ---
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::