TERRO T2512 Ready-to-Use Indoor Fruit Fly Killer and Trap with Built in Window - 12 Traps + 540 day Lure Supply

Use only minimum amount of liquid product, if you put too much seems to repel the purpose.

I have been using these traps for years whenever fruit flies appear in my kitchen. They do work effectively and are handy if you have large swarms of them. That being said, they do not last a full 30 days as advertised. You are lucky if they last 2-1/2 weeks before drying up. I recommend if you notice fruit flies in your home, but don't expect these to last very long once you pour in the fluid.

Work barely

These are fantastic! We recently had a ridiculously insane fruit fly infestation. It started in ONE bathroom (yeah, UGH!), but soon spread to most of the rest of the house. The little pests seemed to be attracted to light, so we left the entryway ceiling fixture on at night and placed five of the traps around the perimeter (on the nearest piece of furniture). We caught several flies--two or three dozen--the first night and even more the second. I'd estimate we've decimated 3/4 of the population, so another week should elimnate the rest. (We use fly swatters to thwack any who won't enter the traps.) The liquid bait smells like, and probably is, apple cider vinegar. [I will clean out the (VERY FULL) traps and refill them with apple cider vinegar + a drop of Dawn ("recipe" from the internet) to see if it's as effective.] Tip for those purchasing these: DON'T bother separating the top from the bottom. It's doable, but a bit difficult. Instead, just unscrew the top of the bait bottle and squirt the contents into the top, center hole on the trap. People may try to build a better mousetrap, but I don't think anyone can come up with a better fruit fly trap. :-)

Fruit flies were driving me nuts. I put 2 of these traps out and within 24 hours the population is almost down to zero, it's actually really impressive.

These little gems are the only thing I’ve found to handle May Fly swarms in the spring. Zero chemicals, it keeps them from laying eggs, attracts them without smelly odors, and so clean and convenient. Worth every penny!