This is just an idea, but have you thought about putting your beehive
into the greenhouse with an exit to the outside from the hive and an
entrance to the greenhouse?  You could use a tube just like they do
for an observation hive to the outside, and leave the full entrance
open to the greenhouse.  Perhaps not even a full hive, but just a
nuc?  No other insects would dare get to your tender plants thru the
hive! ;-)

Vivian




Jonathan Ruel wrote:
>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.