I purchased a package of Italian bees installed them on april 8 th fed them gave them plenty of room and ventilation. They built up quickly as I was adding my second brood box in the 1st half of may. they drew out 7-10 frames so I added a queen excluder and my first super.About 10 days later they swarmed.I have 98% of my bees left as the swarm finally landed in a tree out of reach "of course" but was only the size of a tennis ball maybe. They held this position long enough for me to get my ladder and within 5 minutes they were gone.Lots of capped brood ,uncapped brood and tons of workers and drones. there were about 5 swarm cells that I counted.I put it all back togeather and am now sitting on my hands..Does anyone think the queen excluder pissed them off that's why they swarmed? Why was the ball of bees in the tree so small? Now what? Thank's for any and all help on the matter..