Wash all fruit and veg to wash away eggs. Set traps. Use a screened dome. Keep fruit/veg in fridge in the summer as much as possible. Spray where they might breed. Usually in cracks around sink and counters and in drains. Keep veg and fruit for composting in fridge/freezer not out on counter. Fruit flies are extremely resilient. They ride in from the grocery store on fruit that has been bruised so refrigeration is the first line of defense. Mark Cullen suggests using the herb basil to repel them too.

http://www.ctvnews.ca/5things/expert-advice-5-ways-to-get-rid-of-annoying-fruit-flies-1.2492904

Fruit flies breed in/on the fruits not in drains. Those little fellows that breed in drains are not fruit flies, they are drain flies.

Easy trick: Either eat the fruit before it's over-ripe or refrigerate it.

They don't necessarily come with the fruit you buy. They are normal residents of the environment around your place.

Someone was just talking about this in another thread, I'll see if I can find it, but they said that they spray their fruit with a mild vinegar and water solution that keeps the fruit flies away.

about spraying fruit flies with vinegar and water solution

It is the post by LynnNM

Instead of plastic wrap & vinegar, I use the corner of a plastic baggie to form a cone, snipping a tiny bit off the corner to make a hole large enough for a fly to get through, & some fruit peels (like banana) w/ a little bit of beer or wine - catches them all in no time.

http://www.haleypestcontrol.com/FruitFlies.html

Unfortunately fruit flies are adaptable to breeding all over the place. They are in the environment but are also brought into your home on damaged and or bruised or ripe fruit.

The eggs are easily washed off the fruit so I can see using water and vinegar helping to keep them at bay.

Always wash fresh fruit (except bananas) including tomatoes that, of course, I avoid putting in the refrigerator, and the ff still gather. Will try a couple of methods listed here, and thank you for the posts.

I just put out a lid that I'm throwing away. Fill it with cider vinegar, a drop of soap, and a bit of sugar. The soap kills em dead. Nice trap!

Your home made traps may kill off some flies in your house, but your trap also attracts flies from all around the area into your house.

Fruit flies are small enough to get through window insect screens.

dcarch

They don't get through my screens. Actually, we haven't been bothered by them in the house for a very long time. Tons in the yard, tho - we have fruit trees.