Continue writing the next sentence in this paragraph:

How to repel insects with beer
Kill fruit flies with an open beer can.
Fruit flies (also called vinegar flies) are attracted to fermented beverages like beer and wine. For an effective fruit fly trap, leave an open beer can sitting out with a small piece of paper taped over the lid.
Poke a small hole in the paper to allow the flies to enter the can. They will be unable to find their way out and will eventually drown in the beer.