Mosquito Barrier Liquid Spray, 1 Gallon

America's Premier Mosquito Repellent For Grassy Areas; Yards, Parks, Athletic Fields And Golf Courses.
Just one spraying of all natural, liquid garlic-based Mosquito Barrier will keep mosquitoes out of your yard and away from your home,
24 hours a day for nearly a month.
In stock

Gallon sizes are best for homes on a half acre for the entire season. One gallon covers 5 acres. 99.3% pure garlic extract.

Mosquito Barrier is a very strong liquid garlic made from very potent garlic cloves. The garlic used in Mosquito Barrier is a very powerful variety which is much more potent than the garlic found in grocery stores (in fact, our lab people here refer to it as "super garlic").

Garlic has a natural sulfur which repels mosquitoes. Spraying garlic to keep insects away is not something new, farmers and master gardeners have been doing it for many generations.

Since mosquitoes are soft-bodied insects the garlic juice can be very toxic to them in increased concentrations. The juice does not harm humans, pets or plants, but to mosquitoes it can be deadly. The odor of garlic chases them away for as long as they can detect the odor. The odor of sprayed garlic juice becomes undetectable to humans within minutes, but mosquitoes can detect odor as much as 10,000 times better than a human. So even though you can't smell the garlic, they can and they will stay away from the sprayed area for up to a month or longer. If the mosquitoes aren't in your yard, they can't get into your house.

Additionally, Mosquito Barrier, when mixed with canola oil (available at your local grocery store) plus the water, coats any standing water in the area with a very thin film of natural oil. This oil suffocates the which can develop in standing water. Unlike harmful chemicals, Mosquito Barrier is a natural insect repellent that doesn't kill bees or butterflies and is completely safe for children, fish, birds, dogs, cats and other pets. Be careful of traditional chemical pesticides, they can kill more than mosquitoes.

Generally, four applications are enough for the entire mosquito season. Even in the heaviest of infestations the gallon size is almost always enough for the entire year for most homes - including areas where the mosquito is the state bird.

Mosquito Barrier is a three pronged attack:

(1) It kills the adult mosquitoes.

(2) The garlic coated plants keep mosquitoes out of the area.

(3) It suffocates any mosquito larvae in, such as puddles, under decks, water in tin cans or depressions in lawn, etc.

More Information

How to mix and apply Mosquito Barrier

Mixing & Spraying Instructions:

If there is NO STANDING WATER in the area use this formula:

Mix 4 ounces of Mosquito Barrier into one gallon of water. Stir well and spray about an hour before sundown.

  • 1 gallon water
  • 4 ounces Mosquito Barrier

If there is STANDING WATER in the area - add canola oil to the mixture using this formula:

For each one gallon of water, add 4 ounces of Mosquito Barrier plus 2 ounces of Canola Oil (found in your local grocery store's cooking oil section) and 1 teaspoon of Ivory liquid soap or any other non-scented liquid soaps (not detergents). Stir well and spray about an hour before sundown.

NOTE: The oil is used to put a coating of oil on the standing water to suffocate mosquito larvae. Soap helps the garlic oil mix well with water.

  • 1 gallon water
  • 4 ounces Mosquito Barrier
  • 2 ounces canola oil
  • 1 teaspoon liquid soap

Watch Mosquito Barrier in action with The Urban Naturalist, a professional commercial applicator, in the video below:

You don't need an expensive gas-powered backpack sprayer to apply Mosquito Barrier in your yard. Mosquito Barrier can be applied with with just about any pump-up sprayer from your local hardware store or nursery and range in cost from under $20 for a basic canister sprayer to about $75 for a basic backpack sprayer. Pictured below are two examples of typical pump-up sprayers: a canister sprayer on the left and a backpack sprayer on the right.

Do not spray if it has just rained, the foliage is wet or if rain is expected within 24 to 48 hours of application. Apply on a dry lawn and do not run sprinklers for 48 hours after application.

To apply this solution, you can use a pressure type sprayer. Canister sprayers must be pumped up with air pressure and they have a wand for spraying. The formula for a 2 gallon canister sprayer is to add 8 ounces of Mosquito Barrier and then fill canister with water. Mix well and spray.

Garden hose-end sprayers are not recommended because they are generally very inaccurate and the droplet size is larger than desired. However, if you insist on using a Garden hose-end sprayer - there are two types, one type has a dial for ounces per gallon and the other does not have a dial. For both types, mix 12 ounces of Mosquito Barrier with 20 ounces of water and use this mixture to completely fill the container. On the dial type, set the dial on 2 ounces per gallon, or 4 tablespoons per gallon. Normally it takes about 7 minutes to empty the container with the garden hose on full blast, so you need to be quick, or fill it again until you have covered everything we recommend.

One gallon of Mosquito Barrier is enough for the whole Summer mosquito season. Sprayed every 3 weeks, for the average half acre residential lot, one gallon is enough for 10 applications, if necessary.

No harmful chemicals, safe around children and pets when used as directed, and is biodegradable.

1. When mixing (for use on standing water), mix the Mosquito Barrier and soap together and then add it to the water. Stir the entire mixture until homogenous. If you have very hard water, add a bit more soap to make everything mix well.

2. When spraying grass with the wand on the end of your pump-up type sprayer, hold the wand nozzle about 8 inches above the grass and sweep it back and forth. Make sure the spray gets deep into the grass and use a small spray droplet size.

3. Spray all dark places such as under porches, in vents leading to basement or beneath the house, even spray sides of house, porches, driveways and areas that are not covered with grass - this all helps.

v4. So long as you use at least 4 ounces of Mosquito Barrier per gallon of water you are okay. You may use more. Many of our professional spray people use 4 to 6 ounces of garlic per gallon of water. This does not harm plants or animals and works very well.


There are a few things you'll need to know to effectively repel ticks from your yard and around your house. Mosquito Barrier doesn't kill ticks on contact but it does repel them. Ticks are carried into your yard by animals such as deer or squirrels. A tick will "hang out" in tall grass and on tall weeds as well as on fence posts, wood siding on your home or shed and in shrubs and bushes. They like damp places. They will wait for you to brush against the tall grass or shrub and will cling to you. Knowing this, spraying for ticks is much like spraying for Mosquitoes with a few exceptions:

There's no need to spray standing water or the leaves in a tree. Ticks wait for their prey relatively close to the ground. Do make sure you spray the trunk of the tree. Also make sure you spray all wood fence posts in the area. Spray the wood siding on your home up to a height of about 5 or 6 feet from the ground.

You should also spray under porches and in dark, shaded areas (they rest there in heat of the day). Spray grass, shrubs and all greenery. Don't forget to spray woodpiles and re-stack any firewood - where they may be hiding. Keep grass cut and eliminate tall weeds. Try to keep children and pets inside a sprayed, fenced area. After the first spraying, which should be once over and then once over again, repeat spraying in 7 days and thereafter about every 3-4 weeks during tick season.

How to Apply

Applying I Must Garden Mosquito, Tick & Flea Repellent is easy – simply spray areas you want protected and reapply to maintain control. Please consider the following guidelines:

  • Apply repellent on a dry day. Repellent works best and lasts longest when it is applied to dry surfaces
  • Thoroughly spray the immediate and surrounding areas you want protected to ensure full coverage
  • Allow repellent to dry for at least an hour before rain or watering. For best results wait 48 hours before irrigating after application
  • Reapply every 2-4 weeks, or as needed to maintain control

Other Considerations

  • Mosquitos breed in standing or slow moving water. To minimize mosquito populations be sure to dump out any unnecessary standing water
  • For landscaped water areas consider using Mosquito Dunks to keep your decorative fountains and ponds mosquito free
  • I Must Garden Mosquito, Tick & Flea repellent is not intended for direct application to skin or to animals
For additional information contact us directly with any questions.


Ready-to-Use Approximate Coverage
32oz Trigger Sprayer 250 Sq Ft
1 Gallon Ready-to-Use 1,000 Sq Ft
Concentrate Approximate Coverage
32oz 4,000 Sq Ft
32oz Hose-end Sprayer 4,000 Sq Ft

I Must Garden is proud to use ingredients regarded as safe by the EPA.

To find detailed information about a specific ingredient click HERE

  • Cedar Oil
  • Thyme Oil
  • Rosemary Oil
  • Lemongrass Oil
  • Geraniol Oil
  • Citronella Oil
  • Garlic
  • Vegetabel Oil
  • Vinegar
  • Potassium Sorbate
  • Xanthan Gum
"This is a super product. I bought it locally in a smaller container. This concentrate was unavailable. It is herbal and nontoxic and it works it you use it consistently. You just hook it up to a hose. "
Mary M.
"Prompt service, great seller. "
Susan C.
"Great smelling and works well until the rains came. "
Claude S.
"This stuff is awesome! One application and the critters are gone! Still have dragonflies, tons of frogs, butterflies, & lady bugs, so it seems VERY environmentally friendly. Just try it, you won't be disappointed! Works better than chemical sprays! "
Wendi M.
"The odors coming from this smell like herbs, but it does drive away the bugs. I highly recommend it. Since I have chemical allergies, I cannot use them, and I have dogs and would never spray my yard with them. It is worth it. "
C Maven
"Great service. Highly recommend. "
Eugenia P.
"Seems to work really well. I haven't been bitten once since I sprayed my garden. "
Victoria F.

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