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Target Pests

Ants Aphids, Assassin Bugs, Bees, Boxelder Bugs, California Oakworm, Carpenter Ants, Carpenter Bees, Centipedes, Chiggers, Chinch Bugs, Cluster Flies, Cockroaches, Crickets, Earwigs, Elm Leaf Beetle, Fire Ants (Mounds), Firebrats, Fleas, Flies, Millipedes, Mites, Mosquitoes, Pillbugs, Scorpions, Silverfish, Sod Webworms, Sowbugs, Spiders, Termites (above ground only), Ticks, Wasps


For Use In

For use as a general surface, crack-and-crevice and/or spot treatment for residual and contact pest control in, on, and around buildings and structures and their immediate surroundings and on modes of transport. Permitted areas of use in nonfood/nonfeed areas include, but are not limited to, aircraft (cargo and non-cabin areas only), apartment buildings, boiler rooms, buses, closets, correctional facilities, decks, entries, factories, fencing, floor drains (that lead to sewers), food granaries, food grain mills, food manufacturing, processing and serving establishments; furniture, garages, garbage rooms, greenhouses (non-commercial), hospitals (non-patient areas), hotels and motels, houses, industrial buildings, laboratories, landscape vegetation, locker rooms, machine rooms, mausoleums, mobile homes, mop closets, mulch, nursing homes, offices, patios, pet kennels, porches, railcars, restaurants, storage rooms, schools, sewers (dry), stores, trailers, trees, trucks, utility passages, vessels, vestibules, warehouses, wineries and yards. Food-Handling Establishments.,


  • 1 packet or 1 scoop (0.33 oz.)/gal. of water – 0.1% – maintenance, more frequent applications, foliar applications
  • 2 packets or 2 scoops (0.66 oz.)/gal. of water – 0.2% -- clean-out, severe infestations, exterior applications which receive greater direct sunlight, scorpions
  • For Perimeter Barrier Applications around Structures – Mix 1-2 scoops of Demon WP in 1-5 gallons of water to cover 800-1600 square feet. Higher volumes may be needed for dense vegetation or landscaping materials.
  • 1 scoop is the equivalent of 0.33 oz., 9.5 gm., or 2 level tablespoons

Coverage Area

A gallon of finished Demon WP insecticide usually completely covers a 2,000 to 2,500 sq. foot home.

Time to Kill

Demon WP will begin killing insects in 5 minutes and continue providing pest control for 3 to 5 months.

Mix Rate

Each foil envelope of Demon WP in Water-Soluble Packets contains water-soluble packets of Demon wettable powder. The foil envelope must be opened for use. Because water-soluble packets readily dissolve in the presence of moisture, do not allow them to get wet before adding to the applicator tank. 

Active Ingredient

Cypermethrin - 40%

How To

Demon WP is diluted with water and applied with a gallon pump sprayer. After it dries, Demon WP continues to work for up to 3 months. Demon WP Insecticide works well for a variety of insects, lasting up to 3 months. A gallon of finished of Demon WP mix usually completely covers a 2,000 to 2,500 sq. foot home.

Apply as a coarse, low pressure treatment to areas where these pests hide, such as baseboards, corners, storage areas, closets, around water pipes, doors and windows, attics and eaves, cabinets, furniture, sinks, furnaces, stoves, behind and under refrigerators, the underside of shelves, drawers, and similar areas. Pay particular attention to cracks and crevices. Also see Outdoor Surfaces Use.

Demon WP Insecticide For Insect And Pest Control

Product Q & A

Solutions ()

Demon WP Insecticide For Insect And Pest Control

Demon WP Insecticide, with cypermethrin 40.0% kills large roaches, spiders, crickets and more. It can be used inside or outside. Demon WP Insecticide in its envelopes has been a number one seller for many years due to it's convenience of use. Simply drop the packets in the envelope in water (they dissolve). 1 envelope contains 4 water-soluble packets and makes 2-4 gallons of solution. You will be treating your home just like the pro's
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Customer Reviews

  • Demon WP Insecticide For Insect And Pest Control
    By David Goodrow on 1/10/2016
    Tried Demon a few years ago because of a flea problem and Demon killed all the fleas, inside & outside. Continues to kill fleas and everything else for months. 98% smell free and safe for inside use. Very good product.


  • Demon WP Insecticide For Insect And Pest Control
    By Reagan Koons on 11/2/2015
    I've been using this product for a long time. So long I forgot how many years. It works great both inside and outside around the house. I'm glad I found y'all because it was becoming cost prohibitive for me to go to the local farm and ranch store. Y'all made it possible for me to save enough money to buy my annual amount of Demon WP. Thanks a bunch. Now if I could get a recommendation for a product that would deter varmints such as skunks, 'coons, possums from digging under my house I would appreciate it. Thanks again.


  • Demon WP Insecticide For Insect And Pest Control
    By Richard Getteau II on 8/15/2015
    After getting stung one time in the middle of the night, I have been using this in and around my deer lease trailer for the past couple of years. It works great and on the rare occasion I see a scorpion in the trailer, he's already dead. It also kills pretty much anything else. So that also helps to keep the scorpions away.


  • Demon WP Insecticide For Insect And Pest Control
    By on 4/7/2015
    I love this product, I use it all year round. I had black widows and centipedes, after spraying this within few hours they would be dead. Highly recommend !


  • See All Reviews

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