Who has proof that the bees will use a perfect circle.
It is also known they "will" fly over 3 miles.
You will have to be in an area where there is no spraying the forest, where there is no power lines rights of way to be sprayed. What else do you have?
Lawn treatments, swimming pools, pest control sprays.
Bees go into some strange places to get what they need.
As for organic veggies, the soil has to be with out chemicals for a certain number of years, before you can even start, I forget the number.
A lot of people will buy "naturally grown" labeled veggies as quick as the ones with the big O on the label, can be sold at a less price and you don't have to worry about the "ORGANIC" reg's.
People know what "Natural" means. Don't buck this one.
The last time I treated was (2006) lost 7 out of 12 that fall and the following spring.
No treatment since then and have lost 2 colonies.
You tell me.
As for organic, forget it unless you own a good bank that doesn't need tarp $$$.
I know there are disagreements with what I have said, that is my thoughts, not subject to change.