Ok about 3 month ago i took a colony of strong bee's to my uncles farm to pollinate his pumpkin fields. Checked on them about once a month and everything seemed fine. Low mite counts plenty of food and a good laying queen. Went to get them a couple of days ago and there are hardly any left. Enough to cover a quarter of a frame. Not a lot of dead bee's on the bottom board. Went in today and there was lots of capped dead brood and some dead bees half emerged from cells. No open swarm or supercedure cells Did seem to be some moldy frames. Any thoughts