It looks like chalk brood to me. Don't destroy anything. Take the frames and hold them level sideways and tap the top bars on a bench or table to knock out anything loose in the combs. Use the hive tool and scrape off any excessive burr comb or propolis off the frames and hive boxes. Let them air dry in the sun a few days and put your packages in them this year. Chalk brood can be set off by cooler moist temperatures, however, it does run in the genetics of the bees also, so I would advise getting bees this year from a different supplier than where you got yours from last year. Don't stress to much and have fun!