what is a hover fly?
Hover flies are a family of predatory flies that also feed on nectar. They are great in the garden because they are both a natural pest control and pollinator. They are a diverse family found on all continents except Antarctica so the specific native species in your area will differ. They often mimic bees and wasps even though they aren't related.
How do I get hover flies in my garden?
Hover flies begin as maggots that feed on decaying matter in stagnant water. To attract them simply take a small container, no larger than a bucket is needed and fill with leaves and water. Add a few sticks so when the larvae are ready to pupate they can escape otherwise they will drown. Occasionally top up the leaves when necessary. Keeping the water covered with a layer will prevent mosquitoes.
How will I know if it's working?
The larvae are commonly known as rat tailed maggots and you can identify them by the trademark "tail" (actually a breathing tube). They look freaky but don't worry! They are as harmless as the adults and will stick to their puddle until ready to pupate.
Where do I put it?
The mixture will begin to stink as it decays (this is what attracts the flies in the first place) so leave your diy lagoon in an area that is calm, cool and wont bother anyone with it's smell. They will also be attracted by flowers.
Have fun!
Thanks for the guide! Have you ever had problems with mosquitos while using this method? Edit: Just reread this and realized I missed the part about covering helping to prevent mosquitos. Thanks again for the guide.