Demon WP Pest Control Insecticide Review

demon wp insecticide


  • Manufacturer: Syngenta Crop Protection, LLC
  • Type: Powder concentrate
  • Packet Size: 0.33 oz (9.5 g)
  • Coverage (Per Packet): Up to 2500 sq. ft. (232 sq. m)
  • Target Pests: Mosquitoes, ants, centipedes, cockroaches, beetles, flies, mites, termites, spiders, ticks, wasps, etc.
  • Active Ingredient: Cypermethrin (40%)
  • Lasts: Up to 3 months
  • Use: Outdoors and indoors
  • Residue: Yes (a powdery white film)
  • Odor: No


A company called Syngenta Crop Protection, LLC manufactures this Demon WP insecticide. This company, based in North Carolina, creates and manufactures a variety of different pest control products including insecticide powder concentrates and other agricultural products. Since it was first established in 1996, Syngenta has quickly become one of the leading insecticide manufacturers.

Click here for pricing & more information about Demon WP Insecticide.

Review of Demon WP Insecticide

This Demon WP insecticide is a wettable powder (WP) concentrate. So, with just one packet, you can create a gallon of insecticide at a concentration of 0.1%. This will allow you to spray up to 2500 sq. ft. (232 sq. m) with a powerful, fast-acting insecticide.

The active ingredient in Demon WP is cypermethrin, which is a synthetic pyrethroid insecticide. It kills insects quickly by attacking their central nervous system.

The ingredient is very toxic to most insects, bugs, and pests, as well as fish and most other aquatic creatures, but is mostly non-toxic to humans.

Excessive exposure can cause allergic reactions as well as nausea, headache, and other symptoms, though. We recommend limiting your exposure to this substance by wearing proper clothing and gear when handling it.


The active ingredient in this Demon insecticide is not only efficient but also quite long-lasting. One treatment will usually remain effective for up to 3 months.

If you spray the area again after the initial 3 months, the insecticide can last even longer.

Just make sure that you let the insecticide dry completely after spraying. This is crucial for it to begin working.


The manufacturer recommends using this insecticide with a solution sprayer. This ensures uniform coverage without needing to spend a lot of time spraying the area you wish to treat. Simply open the foil packet and put one of the 0.33 oz (9.5 g) water-soluble packets into 1 gallon (3.78 L) of water. Allow 1 to 2 minutes for the powder to dissolve and then spray the desired area with this insecticide.

Make sure that you shake the insecticide quite frequently so that the powder stays fully mixed with the water. You want to spray the insecticide solution, not just water.

This is a powerful insecticide that combats a lot of different insects from mosquitoes to ants, ticks, flies, and termites to even bigger bugs like wasps, bees, spiders, and cockroaches. You can see the full list of Demon WP target pests here.

You can use this Demon WP insecticide both indoors and outdoors. It’s great for perimeter, spot, and foundation treatments as well as an overall insecticide. Just remember it will leave a slight residue, a powdery white film that will be especially noticeable on dark furniture and surfaces. Keep that in mind when you use this insecticide inside your home.


Don’t forget to use gloves, long clothing, protective glasses, and a respirator when handling this insecticide in solution or powder form. You want to prevent it from getting on your skin, in your mouth or eyes, and in any open wounds, where it can cause irritation.

After you’ve finished spraying, make sure to store the unused packets in a dry place. Any moisture will dissolve the insecticide, so you won’t have any left to use the next time you want to treat your yard.


Demon WP will work wonders in both indoor and outdoor settings. This is an efficient and fast-acting product that will help you get rid of many different insects, ranging from mosquitoes to ants, cockroaches, and wasps. Instead of a liquid, which tend to be messy and hard to store, this is a water-soluble powder that you can easily mix yourself to create a powerful insecticide solution.


Chris Milas

Demon insecticide seems very effective, thanks for the amazing detailed review.

Dru johnson

I have ants in some mulch I purchased. Can I spray the mulch and then use it in my flower beds without harming the plants?


    Since Demon WP is more of a spot treatment than an overall lawn treatment I wouldn’t advise you to spray the mulch you bought with this product.


Does this product work on Mice


    Being an insecticide, it’s meant for use on insects. You can look at our top picks for mouse poisons to pick one that suits your needs.


Will this product help with scorpions?


    Yes, the product is labeled for use against scorpions.

Mary Nezat

Can you use to kill carpenter bees?


    Yes, the product is labeled for use on carpenter bees.


Is this safe for dogs or cats to be around after it is sprayed?


    You need to let the treatment dry before you let your pets back in the area.


Can I spray my pets with this??


    No, it can not be used on pets. Also, when you do treat an area, you should also make sure that pets (as well as humans) have no access to it until the treatment has dried.

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