How do grocery stores control fruit flies?

This really depends on what you are talking about when you say "fruit flies". I suspect that what you are calling "fruit flies" are actually the "vinegar flies" that are attracted to very ripe and rotting fruit. read more

A grocery store employ a lot of pest control measures to avoid fruit flies. There are light traps all over the store .They use light and glue traps to catch insects. To a person who doesn't know what they are , it looks like any other light that shines up on the wall. read more

Though I would say that the stores management would be actively working to make the environment less attractive or comfortable for the flies, so keeping floors clean and dry, being proactive in cleaning up spoiled fruit, and management of the stock, removing unsold fruit. read more

Sometimes you’ll see Venus fly trap plants sold in the fruit section of grocery stores and marketed as a great way to control fruit flies. However, my experience is that the nectar in a Venus fly trap has nothing on the intoxicating sweetness of an over-ripe banana. read more