>Hi:
>
>Open feeding is an open invitation to any other bees in the neighborhood
>(feral, your neighbors, etc.).  As such the potential for spread of
>disease and mites is high.
>
>Jerry Bromenshenk
 
I agree with Jerry.  Furthermore, open feeding benefits the stronger
colonies most while the weaker, more needy colonies do not have the field
strength to take full advantage.
 
Ed Levi