Lavender, eucalyptus, peppermint, lemongrass, and citronella are just a few of the scents that insects despise (with lavender probably being the most effective). Pouring half or an entire cup of such essential oil onto a sponge or rag, then storing it in a small can, helps keep flies at bay.
Make a natural cleaning/fly killer mixture.
Mix together 1/2 cup of salt, 1/2 cup baking soda and 1 cup of vinegar. Pour the mixture down the drain. Let sit overnight, then flush the drain with hot water in the morning. This should kill all flies and the organic material they've been feeding on.
Boil a medium-size pot of water once or twice per week, and pour down and around the drain. Another easy option uses baking soda: Combine 1/2 cup salt with 1/2 cup baking soda and 1 cup of vinegar, and pour down the drain. Leave overnight, and finish by pouring boiling water down the drain in the morning.
Bleach will absolutely kill drain flies. However, using bleach comes with certain risks. It's better to try other methods first and use bleach as a last resort.
What Smell Attracts Drain Flies? Drain flies are attracted to the smell of sewage, rotten food, moisture, mildew, and other bacteria. These smells often come from kitchens and bathrooms, where moist organic matter frequently becomes trapped in pipes. Some theories suggest drain flies are attracted to vinegar.
Drain flies thrive in stagnant and standing water. Common sources include slow or clogged drains, rarely used and unused toilets, refrigerator drain pans, and standing water created by leaking pipes. They typically enter buildings through basements, windows, and drains.
Adult flies emerge from the breeding sites but may remain nearby. Drain fly control often fails because people don't realize just how resistant the scum and the larvae are to boiling water, bleach, detergent, and even caustic drain cleaners (see How Can I Get Rid of Drain Flies?).
Adult drain flies usually live about two weeks, but newly emerged adults rapidly replace them. These flies are also known as moth flies due to their appearance: they are small and furry with large, ovoid wings and prominent antennae.
Pour one-quarter to one-half cup of apple cider vinegar into a bowl. Cover it with plastic wrap, then use a fork to poke holes in the wrap. Set the dish next to your sink. The drain flies will not be able to escape and will drown in the vinegar.
Baking Soda, Boiling Water & Vinegar
The pour half a cup of bicarb soda down the sink as well, followed by a half cup of white vinegar. Let it settle for a few minutes then poor some more boiling water down the drain. Follows these steps every few days until the drain flies have completely disappeared.
They do not bite, sting, or spread diseases, but their decaying bodies may cause allergic reactions. They can also spread bacteria from trash, decaying vegetables and fruits. Drain flies breed in areas that are moist and have a lot of organic remains, including: Sinks.
"Combine 1/2 cup salt with 1/2 cup baking soda and 1 cup of vinegar and pour down the drain." Leave it overnight, and in the morning, pour boiling water down the drain. "This is a natural remedy that will clean the plumbing pipes and remove the breeding grounds for these flies," he explains.
Some species hold the wings out to the side, which gives them a moth-like appearance—hence the name "moth fly." They are weak fliers and make irregular, hesitating flights covering only a few feet in short, jerky lines. Eggs are tiny, brown or cream-colored and are laid in irregular masses of 10 to 200.
Your kitchen sink and garbage disposal is paradise for drain flies. Their ideal breeding environment is wet, humid, and laced with food waste to feed on. Your first course of action to deal with drain flies is prevention. Don't throw anything down your garbage disposal that will cause build-up.
Adult drain flies feed on decomposing organic matter and sewage. Their larvae feed on bacteria, fungi, and other microorganisms that develop in drains, standing water, and even sewage treatment beds. If food runs out, drain fly larvae may eat each other.
White vinegar can be used to catch fruit flies, but they'll be MUCH more inclined to fly into a trap if apple cider vinegar is used. Make a trap as described in the previous paragraph, with a jar and plastic wrap. Here's a fun experiment that kids will love: try out both white vinegar and apple cider vinegar.
So, the starting point would be to check the nearby drain pipes for infestations using the following methods: Duct tape test: Cover all the pipes with sticky tape. As flies try to come out of the drain, they will get stuck on the tape, giving proof of the source of the infestation.
During the day, you'll notice drain flies resting on the wall since they aren't good fliers. At night, when they are active, they will congregate towards light sources, like lampshades. They will also feed and breed at night, so you'll see them near food sources or breeding areas.
Behavior: Drain flies are most active at night. They are weak flyers that make short hopping flights of a few feet when they are disturbed. Drain flies rest on surfaces with their wings held over their back like a roof. You'll usually find a drain fly close to its breeding ground.
Nine times out of ten, a drain fly problem will go away on its own. Once you get rid of the drain flies that you see, start flushing toilets and running the water in your sinks. This eliminates the standing water in which they dwell.
For the most part, drain flies are not dangerous and not harmful. Having drain flies around your home does not mean your drains are dirty or your kitchen, bathroom or other areas are unclean. They are opportunistic insects and can get inside and find any moist area to lay their eggs and breed.
One possible sign of an undetected mold problem in your home or office could be the presence of Phorid flies, sewer flies or some other gnats or bugs.
Drain flies do not bite humans but may become a nuisance by their presence in large populations. Sometimes it takes persistent effort to eradicate an infestation in the home. Concentrate on eliminating larval breeding sites from drains in floors, sinks, wash basins, bathtubs, etc.