I have a small popup plastic greenhouse with my tomatoes and meyer lemon tree. Have a few bees in there doing their "work" which is great. But this last week a bunch of flies showed up -- looks like regular black flies. So many of them that they are buzzing and making a lot of noise. I didn't want put the sticky traps in there because the bees need to be able to do their work. Took some pics but they don't show up very well. Do I let the flies stay - if not, how to I eject them?

Get yourself a fly trap. I use these and they work a treat. I hate flies in my greenhouse. They are annoying.

Unless you have plants that need them as pollinators, no problem in eradicating them from your greenhouse.

http://www.bunnings.com.au/env...

@sunlover thank you