My passive DIY trap

[krasi0]

It's basically made of one of those huge transparent water bottles (11 litres) cut in half with the upper half facing downward. The bottom half of the bottle is partially filled up with (rain) water and has some tree leaves and grass in it. There is a piece of mosquito net (mesh) on each side meeting in the middle so that mosquitoes can't actually reach the water and lay their eggs (this is important!).
There is a black plastic bag put around the upper half to make it more attractive as mosquitoes prefer dark / black colors.
The great thing is that the trap is completely passive. You only need to replace the water once per month or so. Preferable places to put it are in shady corners where it's not windy, e.g. under a tree. Also make sure that you remove any other standing water in a 100 metre radius so that mosquitoes flock to the trap instead. It mostly catches them after they have had a blood meal but sometimes you can see others which are just attracted to the water when the air outside is very dry.

Another advantage is that there is very rarely any other type of insect caught up inside which means that the trap discriminates nicely and doesn't affect the ecosystem in non-desired ways.

In design it's quite similar to the GAT trap by biogents (without the sticky tape), but costs < $1 to make:
https://us.biogents.com/wp-content/uploads/BG-GAT-cross-section-principle-of-function-198x300.jpg

Some (admittedly bad) photos added

BTW, @mariusa It appears that I am not allowed to add labels?

[mariusa]

Thanks Krasi! I've added this to the README.

What prevents mosquitoes flying out once they got in?
BG-GAT has a sticky tape.

The bottom half of the bottle is partially filled up with (rain) water and has some tree leaves and grass in it.

Good idea to create the best natural environment for them!

[krasi0]

You could spread around a very thin layer of some vegetable oil on the inside of the upper half. But additionally the entrance is very narrow and most mosquitoes can't find their way out before they starve to death

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On Wed, Aug 7, 2019, 13:37 Marius A ***@***.***> wrote: Thanks Krasi! I've added this to the README. What prevents mosquitoes flying out once they got in? BG-GAT has a sticky tape. The bottom half of the bottle is partially filled up with (rain) water and has some tree leaves and grass in it. Good idea to create the best natural environment for them! — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2?email_source=notifications&email_token=ABPGAO7WUMMMFK7FBXLMII3QDKQVRA5CNFSM4IJVFKY2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3X7E3I#issuecomment-519041645>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABPGAOZD4XBYHHGQC6KVKM3QDKQVRANCNFSM4IJVFKYQ> .