I am a licensed beekeeper in Illinois. Have been since 1976.
It's one of those things you don't tell everyone but why not?
I have a garden, yards I maintain, but no colonies of bees right now.
Something I noticed in the last decade or so is the disappearance of honeybees. I used to see them working flowers and trees often and it has gotten rare. Bumblebees and wasps seemingly have disappeared as well. I still see wild honebees that everyone calls "yellow jackets" but that is about all. I also see plenty of carpenter bees.
There are several theories on why...
One is neonicatinoid insecticides. I believe that these chemicals is the cause of colony collapse disorder.
Another thing I myself have observed is the disappearance of white clover from nearly every single lawn. My bees made the best honey from this yard "weed".
Nearly everyone is sold on the idea of fertilizing and killing the weeds in one easy step. This is what made the clover go away. Try NOT fertilizing your yard a season or two and see what happens. The fertilizer is high nitrogen which clover...can't stand.
My bees disappeared at about the same time CCD was discovered. It's expensive to get started again. I kinda miss having a few gallons of honey in the house.