I noticed some bees were being evicted today. I thought it was too early for drones to get booted out. A closer look revealed Deformed Wing Virus, which is transmitted by varroa mites.
Of course, I found this in front of one of my strongest hives. Varroa seem to really hit strong colonies the hardest.
What a motivator to get more shims made so I can use the apivar. Instead of treating some colonies with the apivar and shims I had on hand, maybe I should have waited to blast them all at once. I may have created a varroa bomb.