Re: Trouble with my first hive
Kenneth, you may not have done anything wrong. With only one hive you don't have a good reference point.
In my opinion, 15 bars of comb from a new package is a little shy of optimum. If there wasn't adequate incoming nectar to get more built, I would have fed syrup. My TBHs started from packages in March 2012 built 25+ bars over the season, with only about 2 gallons each of syrup at installation.
Aside from the varroa issue brought up above, I would look also at how your hive ventilation works.
My TBH hives are all top entrance following the Michael Bush design. This should eliminate any condensation in the hive issues.
USDA Zone 7a - elevation 1400 ft