How to Kill Mosquito Larvae in Water

We’ve written in the past about the best mosquito killer for getting rid of adult mosquitoes. But killing adult mosquitoes is only part of the equation. To eliminate your mosquito problem for good, you need to get to the source.

Mosquitoes lay their eggs in standing, stagnant water. Those eggs hatch into larvae, which is the next stage of the mosquito life cycle. If those larvae grow unchecked, they will quickly turn into hungry, bloodsucking adult mosquitoes that will invade your home.

mosquito larva in a pond
Mosquito larvae in a pond

So what do you do when you find mosquito larvae?

There are two approaches to dealing with this problem. The first is to kill the existing larvae. The next is preventing larva growth in the first place.

Let’s go over each of these methods.

Killing Mosquito Larvae in Water

No matter who you are, it goes without saying that you hate mosquitoes. Just hearing one buzz around your room can drive anyone crazy.

But mosquitoes are far more than just an irritation.

Mosquitoes are the main vector for several bloodborne diseases. These include the West Nile Virus, the Zika Virus, and Eastern Equine Encephalitis. So mosquitoes aren’t just a nuisance, they’re a health hazard.

If you find that you have mosquito larvae in standing water then you need to deal with it. Here are a few ways to nip those little bloodsuckers in the bud.

mosquito larvae in water in old tire

Remove The Water

Perhaps the most obvious method of getting rid of mosquito larvae is simply to eliminate the water altogether. This means you have to find any sources of standing water on your property.

Look for puddles on your lawn. If there hasn’t been a recent flood or rain, puddles are a sign that you’re over-watering. Water your lawn less, and these puddles should soon disappear.

Also look for lawn equipment that has been left outside. Lawnmowers, wheelbarrows, and other similar equipment can fill with water, creating a perfect habitat for mosquito larvae.

Pool covers and boat covers are another source of stagnant water. Dump these out and dry them thoroughly. The last thing you want is to provide a free, preventable source of standing water.

While you’re at it, look for buckets, old tires, pails, and watering cans that have been left outside. If you must leave a bucket outside, flip it upside-down to prevent water from pooling.

And don’t forget to change your bird bath regularly. Bird baths are a frequently overlooked source of standing water, because we expect them to be full.

Use a Larvicide

Getting rid of standing water may be the easiest solution, but it’s not always practical. There are some places, like ornamental ponds, where we expect for there to be standing water.

In those cases, one solution is to use a larvicide. These are chemicals that kill mosquito larvae, leaving your water pristine.

At least, the water will look pristine. In actuality, the water will be unsuitable for human consumption. If you use a rain barrel to collect drinking water, do not use a larvicide to decontaminate it.

Mosquito dunks are the most common form of larvicide. While they’re not safe for humans, they’re perfectly safe for fish. This makes them a great choice for koi ponds and other outdoor fish habitats.

To use mosquito dunks, simply drop them into your water. The instructions will tell you how many are required for a given water supply. A good set of mosquito dunks will last for 30 days or more.

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Vegetable Oil

Mosquito larvae have a unique method of breathing. They actually have snorkels on their rear ends. This is why you’ll generally find them congregating on the surface of the water.

One way of killing these larvae is to cut off their air supply. If they can’t penetrate the surface of the water, they won’t be able to breathe. This way, you can simply suffocate them to death.

To do this, you’ll simply need to coat the surface of the water with something their breathing tubes can’t penetrate. One good option is vegetable oil. Simply spray enough vegetable oil on the water that there’s a visible gloss on the entire surface.

The main advantage of vegetable oil is that it’s non-toxic. In small amounts, it won’t cause any issues with your drinking water.

That said, it’s a poor choice for fish ponds. Fish need their water to have contact with the air, to ensure oxygen exchange. If you use oil to treat your fish pond, your fish will die along with the mosquitoes.

Soap

Another way to suffocate those baby bloodsuckers is to use dish soap. A single drop of water is enough to treat a gallon of water. So if you have a 100-gallon pond, use 100 drops of soap.

Dish soap works the same way as vegetable oil: by blocking the breathing tubes of mosquito larvae.

The advantage of soap is that it’s cheap, and at these concentrations it won’t ruin the appearance of your pond. The downside is that it’s not a good choice for drinking water or for fish.

Cinnamon Oil

If you’re looking for an environmentally-friendly way of killing mosquito larvae, cinnamon oil is a solid choice. And it doesn’t just kill the larvae; it also kills off the eggs as well.

To use cinnamon oil, add a ratio of 15% cinnamon oil to 85% water. So if you have a 100-gallon pond, use 12 ¾ gallons of cinnamon oil.

While cinnamon oil is not toxic to humans, it’s not a good choice for fish ponds. That said, it smells fantastic, adding a pleasant aroma to your entire property.

In addition, you probably don’t want to use it for drinking water. It’s not going to hurt you, but at 15%, it’s going to have a strong taste.

Research also indicates that cinnamon oil acts as a repellent for adult mosquitoes. So while you’re killing off the larvae, you can also help drive off some of those full-grown bloodsuckers.

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Apple Cider Vinegar

Apple cider vinegar is another effective way of eliminating mosquito larvae. It needs to be added in the same fashion as cinnamon oil, at a ratio of 15% to 85% water. Less will not work.

It’s not as effective as cinnamon oil, though. While cinnamon oil works almost instantly, apple cider vinegar takes about 18 hours to be effective.

Like cinnamon oil, apple cider vinegar is not a good choice for fish ponds. However, it’s perfectly safe for humans.

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Preventing Mosquito Larvae in Water

There’s an old saying that an ounce of prevention is worth a pound of cure. How does this apply to mosquito eradication?

Simply put, stopping larvae in the first place is better than killing them once they’re in place. There are a couple of reasons for this.

For one thing, no eradication method is 100% effective. In other words, you’ll still end up with a handful of adult mosquitoes.

Secondly, prevention methods are better for you and the environment. Here are a few effective prevention methods.

Use Water Aeration and Movement

standing watear aeration

As we mentioned, mosquitoes prefer to lay their eggs in still, stagnant water. That’s why you’ll find mosquito larva in a pond, but not in a river.

To discourage mosquitoes from laying their eggs, a pump or a pond aerator is one of the best solutions. This will keep the surface of the water moving, which will drive mosquitoes away.

In addition, if there are any existing eggs or larvae in the water, it can also help kill them. This is because it makes the surface turbulent, which disturbs the larval breathing process. It’s the same reason that mosquitoes don’t like to lay their eggs in moving water to begin with.

A pump or aerator is also a great choice for fish ponds. It helps oxygenate the water, promoting strong, healthy fish.

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Use Mosquito Eating Fish

koi in a pond to kill mosquitos

We’ve talked a lot about fish ponds in this article. But did you know that many species of fish can actually help prevent mosquitoes?

Several species, such as koi, goldfish, bluegill, guppies, catfish, and the appropriately-named mosquitofish love to eat mosquitoes.

Adding one or more of these fish to your backyard pond can kill two birds – and many mosquitoes – with one stone. First, you’ll add an attractive touch of life to your pond. Second, you’ll get rid of your mosquito problem.

When you purchase your fish, make sure that the fish are suitable for your area. Not all fish are equally suited for all climate zones.

Reduce Vegetation

An important part of preventing mosquito larvae is to discourage adults from coming around. The fewer adult mosquitoes in the area, the fewer eggs and larvae you’re going to see.

Adult mosquitoes feed in the twilight hours. But during the daytime, they shelter in low vegetation. They particularly appreciate wet areas, such as next to a pond.

By eliminating vegetation around ponds and pools, you can encourage adult mosquitoes to live elsewhere.

If you maintain flower beds, ensure that the mulch stays dry. This doesn’t mean you should avoid watering altogether. But the leaves should not be dangling down into a moist environment.

Remove All Unessential Standing Water

standing water contains larvae

We already talked about removing standing water to kill mosquito larvae. But why wait until you have a problem before you take action? Proactively removing standing water can stop your mosquito problem before it starts.

Mosquitoes start breeding in the spring. As soon as the temperature rises above 50 degrees Fahrenheit, they’ll start to lay their eggs.

When it starts to get warm outside, give your yard a good spring cleaning. The fewer mosquito breeding areas there are at the beginning of the season, the fewer adults you’ll have to deal with later.

Bye Bye Mosquitoes

We hope you enjoyed our guide to killing mosquito larvae. These valuable tips will surely help you to get rid of your pesky mosquito problem.

Remember, mosquitoes aren’t just a nuisance, they’re a health hazard. These pests cause major harm to humans as well as our pets and domesticated animals.

Let us know what you think! Leave a comment to tell us how these tips worked for you. And don’t hesitate to let us know if there are any mosquito removal tips we forgot to mention.

If you enjoyed this article, share it on social media. Mosquitoes effect everybody, so all of your friends are sure to benefit.

mosquito larvae in water pinterest image

Pricing last updated on 2020-11-27 at 04:32 / affiliate links - Details

8 thoughts on “How to Kill Mosquito Larvae in Water”

  1. Hi, I have mosquito eggs on my lucky bamboo plant. Which of these solutions are best suited for me? I also don’t want to kill the plant but the eggs are not in the water, they are on the bamboo itself. Please reply as our house is getting a lot of mosquitoes indoor.

    Reply
  2. hello, i have a couple of small container water gardens. both have plants in them that do not like water turbulence (water lilies) and i don’t have access right now to dunks. ques – can i put cinnamon oil in water without hurting plants? if i don’t have cinnamon oil, can i use cinnamon sticks or powder effectively? are there any other oils i might use? many thanks for all the advice!!!

    Reply
  3. I have a barrel that gravity feeds my chicken water cups and it’s a breeding ground for mosquitoes. Would Neem oil be ok for that? It’s the bottom 2/3 of a plastic 55 gallon barrel so it’s pretty big. Or would vegetable oil he better for that application? I also have apple cider vinegar. Would it be too much ACV for the chickens if I did the correct ratio of 15% ACV to 85% water?

    Reply
  4. Have a new plant w drainage at bottom – one of those big round pots tipped at an angle – Southwestern style. Trying to sprout seeds so was keeping moist. When I spritz mosquitos fly out. Tried houseplant bug spray. But only killed some young seedlings.
    Hoping to keep pot w cactus & wildflowers.
    Can the larvae live in moist soil?
    Any recipes for cinnamon oil?
    Will I ever be able to keep them from hanging out at in that pot? Mosquito netting?

    Reply

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