How to make a homemade mosquito fogger

Written by lisa parris
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How to make a homemade mosquito fogger
Mosquitoes can be unpleasant, but dealing with them doesn't have to be. (close up on a mosquito image by Stephen Gibson from

Mosquitoes are one of the most annoying of all outdoor pests and controlling them can be a challenge. For those who are put off by the use of harsh chemical on the skin or in the environment, fogging may present an ideal solution. Mosquitoes find all kinds of smoke unattractive, whether it is from a cigarette, a campfire or a smoke bomb, such as the type used in commercial foggers. Unfortunately, commercial foggers can be expensive; however, a simple and effective substitute can be made for a fraction of the price, creating fog without expensive equipment.

Skill level:

Things you need

  • Hotplate
  • Potassium nitrate
  • Table sugar
  • Skillet or large saucepan
  • Aluminium foil

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  1. 1

    Set up the hotplate on a sturdy table in a well-ventilated area. Gather your materials and prepare the foil by tearing it into squares. The size of the square will vary according to the size you'd like your fogger to be. Larger pieces of finished product will burn longer and produce more fog, but they take longer to dry.

  2. 2

    Add potassium nitrate and sugar to the skillet. Use approximately three parts potassium nitrate to two parts sugar. For example, you can use three cups of potassium nitrate and two cups of sugar; although you may want to use a large sauce pan rather than a skillet when preparing such large amounts.

  3. 3

    Set the pan over low heat and stir constantly. Watch the mixture carefully; as it heats, it will begin to darken. Eventually the sugar crystals will begin to melt. When this happens, reduce the heat to the lowest setting and continue to stir. When the mixture is thick, bubbly and smooth it is finished.

  4. 4

    Remove the mixture from the heat and pour it onto to prepared squares of foil. As the material cools it will harden and dry.

  5. 5

    Allow the material to dry completely. This takes approximately two days. Once the material is dry, remove the foil. To use, simply place in a central location outside and light directly. The resulting fog will keep the mosquitoes out of the affected region.

Tips and warnings

  • Fill the skillet or saucepan with hot water and allow it to soak overnight for easy removal of the sugar crystals.
  • Potassium nitrate can be found in garden centres as it is commonly used as a fertiliser.
  • Only use fogging material in well-ventilated areas out of doors.
  • Be sure to place fogging material on surfaces that are not flammable.

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