Vermicomposting, worm bin, composting with worms community and forums
I've got a Worm Inn and it has a bottom that can't be sealed, I've also left it open for allowing some VC to dry and/or naturally drop.
Eight months going and no flying insects yet :). I've had both fruit flies and fungus gnats in my first RM bin. All stuff I add was frozen first. So I'm finding the seal on the top to be the most important.
I have a 4'x2'x2' FT in my basement. Keeping a Shop Light on with a fly paper strip hanging does the trick.
There are some gnats in the basement but nothing in our main living space.
I'm pre-composting the food with coffee & cardboard outside. It’s in a barrel with window screen across the top to keep the larger bugs out.
I've tried the pre-made yellow sticky traps. They are too much work to clean and reuse. Fly paper strips are about $5 for 2 and they last months.
All my systems from mortar trays, Bentley bins, fts and a Worm Inn are inside and as long as I freeze the food scraps and keep everything well covered with dry shredded paper I have no problems with insects.