Eli5 How do fruit flies appear even when there’s no fruit?

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Every now and then I’ll be having a glass of wine and one single fruit fly will show up and be gone by the next day. I have no fruit in my house. There’s a few vegetables in the fridge. Everything’s clean and there are none in the trash. I’m so confused. It’s happened a few times.

I know fruit flies appearing has been asked 1000 times but I’ve gone through them and can’t find a question without fruit.

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8 Answers

Anonymous 0 Comments

The eggs are really, really tiny and easily overlooked. They can travel on many different surfaces, and can be transfered to different surfaces pretty easily. If you buy groceries from a store with fruit, you could bring eggs home, even without the fruit.

It could also be a different insect and not a fruit fly. You would need to research flying insects native to your area. Many state universities have some sort of annex or other community information program that might be able to help you.

Anonymous 0 Comments

Contrary to their name, fruit flies will infest any rotting material (not just fruit). They’ll find any source of moisture or decaying material, including sponges, mops, or even puddles of water. This type of material is where adult fruit flies lay eggs. Kitchen sink drains commonly foster fruit fly infestations.

Anonymous 0 Comments

They’re probably drain flies, not fruit flies. As the name implies, they come up out of your drains. They look similar.

Anonymous 0 Comments

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Anonymous 0 Comments

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Anonymous 0 Comments

They are attracted to certain chemicals, esters for one, they are given off by rotting fruit, they are also given off by wine, beer etc as products of fermentation.

Anonymous 0 Comments

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Anonymous 0 Comments

I remember trying to evict them for several years then during a kitchen renovation I found a small unnoticed crack in the desk near the sink where the water was draining. The insides of the material were totally rotten. Since I replaced it not a single smol fly, so I guess it was it. Maybe you also could have such a hidden nest.