How can I allow my bees entrance to the greenhouse but exclude grasshoppers?
We have so darn many grasshoppers in my area that the only way to grow
anything is in a greenhouse or screen box.  But I still want my bees to
have access for pollination.  Any ideas on how to build an entrance for
bees that won't also allow the grasshoppers?  The young grasshoppers are
quite small so making a small hole for the bees still lets them in.

Interesting observation - lately, I've seen grasshoppers (which obviously
usually stick to plants) eating dead bees in front of my hives.

Jonathan Ruel
Flagstaff, AZ, USA
7,000 ft. a.s.l.