Demon WP Insecticide
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Average Rating

5 out of 5 stars Rating: 4.8

1,143 Reviews | 526 Q&A

Product Overview

Demon WP is an excellent professional insecticide that's perfect for crack and crevice and/or spot applications for residual and contact control of Ants, Carpenter Ants, Cockroaches, Crickets, Spiders and many other insect pests. Demon should be applied with a sprayer.

The 1 pound jar size of Demon WP has been discontinued and is no longer being made by Syngenta.

Features and Specs

Active Ingredient Cypermethrin 40%
Target pests Ants, Carpenter Ants, Cockroaches, Crickets, Spiders and others
* See label for complete list
For use in Commercial and Residential, on and around Buildings, Lawns, Trees and Shrubs for Athletic Fields, Industrial Buildings, Parks and Recreational areas and others
* See label for complete list
Application 1 packet per gallon of water (for 0.1 percect active ingredient)
2 packets per gallon of water (for 0.2 percent active ingredient)
* See label for complete application instructions
Yield 1 envelope contains 4 water-soluble packets and makes 2-4 gallons of solution
Formulation Professional Product
Group 3A Insecticide
NOT FOR SALE TO CT, NY, VT (Restricted To Licensed Applicators Only)
Special Features Demon WP leaves a white powdery film that is especially noticeable on dark surfaces
Shipping Weight 0.12 lbs
Manufacturer Syngenta (Mfg. Number: 74819)
EPA Registration 100-1000

Details

How Demon WP Insecticide Works

Demon WP is a residual insecticide concentrate with the active ingredient Cypermethrin. Cypermethrin is in the synthetic pyrethroid class of insecticides. It is a man-made active ingredient that attacks the central nervous system of insects that come in contact with or ingest it. 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 Target Pests

A variety of crawling and flying pests including (but not limited to) ants, boxelder bugs, cockroaches, crickets, earwigs, scorpions, spiders, and wasps

PESTS CONTROLLED WITH THIS PRODUCT: 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

Target Uses of Demon WP

Demon WP (Water-soluble Packets) Insecticide is for crack and crevice and/or spot applications for residual and contact control of Ants, Carpenter Ants, Cockroaches, Crickets, Spiders and certain other insect pests. The Demon WP water-soluble packets make mixing and use very easy when used with a 1 gallon compressed air sprayer. (See our selection of sprayers in our Sprayers section).

Demon WP (Wettable Powder) is excellent for larger, tougher pests such as cockroaches, spiders, scorpions, or stink bugs because there is a high concentration of active ingredient. Demon WP is labeled for a wide variety of pests, however, making it an extremely popular general use insecticide for perimeter treatments outdoors or crack and crevice treatments indoors.

The wettable powder formulation also makes Demon WP ideal for porous surfaces such as concrete since the individual particles of active ingredient are larger and can more easily stay on top of the surface.

Demon WP leaves a white powdery film that may be visible on darker surfaces. For applications where this is a concern, consider using a liquid concentrate instead.

Demon WP Insecticide Application Instructions

Each foil envelope of Demon WP Insecticide in Water-Soluble Packets contains four water-soluble packets of Demon wettable powder (WP). 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.

Wear dry gloves when handling the water-soluble packets. Handle with care because excessive handling may cause rupture of the water-soluble packet. Unused water-soluble packets should be stored in the original foil envelope, folded over to minimize exposure to moisture.

Demon WP Insecticide in Water-Soluble Packets are intended for dilution with water for applications. For best results, dilution should be achieved if the following steps are taken:

  1. Fill applicator tank 1/2 with water.
  2. Add desired Demon WP Insecticide in Water-Soluble Packet(s).
  3. Allow 1-2 minutes for dissolution of water-soluble packet(s).
  4. Agitate, stir or shake applicator tank.
  5. Finish filling applicator tank and agitate again before use to ensure satisfactory suspension.

Note:

  • Upon standing without agitation for more than 1 hr., the applicator tank should be agitated, stirred or shaken again to achieve satisfactory suspension.
  • Make up only amount of application volume as required.
  • This product should not be applied with oil.

Tank Mixing

Demon WP in Water-Soluble Packets may be tank mixed with other currently registered pesticides unless expressly prohibited by the product label. A small volume mixing test with the other products is recommended to ensure compatibility. Observe all restrictions and precautions which appear on the labels of these products.

* Repeat treatments as necessary, but not more than once every 7 days.

1 envelope contains 4 water-soluble packets and makes 2-4 gallons of finished solution.

Standard Application Dilution rates / Mixing Ratios for Demon WP:

  • 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.

Demon WP is for use in the following areas:

Demon WP is for crack and crevice 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 include, but are not limited to, industrial buildings, houses, apartment buildings, laboratories, buses, greenhouses and the nonfood/feed areas of stores, warehouses, vessels, railcars, trucks, trailers, aircraft (cargo and noncabin areas only), schools, nursing homes, hospitals (non-patient areas), restaurants, hotels and motels, and food manufacturing, processing and servicing establishments, food granaries, food grain mills, and pet kennels. Demon WP is also for use on lawns, ornamental trees and shrubs around residential, institutional, public, commercial, agricultural and industrial buildings, and parks, recreational areas and athletic fields.

Demon WP Authorized by the USDA for use in inedible product areas in Federally inspected meat, poultry and egg processing plants.

Indoors

See above for complete mixing instructions.

Cockroaches, Spiders, Crickets, Scorpions, Silverfish, Ticks and Firebrats
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, 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 Surface Use on the product label.

Ants
Apply Demon WP to any trails, around doors and windows and similar areas where ants (including carpenter ants) may be found. Apply perimeter barrier treatments to prevent infestation as described below; also see Outdoor Surface Use on the product label.

Bees, Carpenter Bees and Wasps
Thoroughly treat nest and entrance, surfaces and surrounding areas with Demon WP where these insects alight; also see Outdoor Surface Use on the product label.

Assassin Bugs, Boxelder Bugs, Sowbugs, Pillbugs, Millipedes, Elm Leaf Beetle and Centipedes
Apply around doors and windows and similar areas where these, or similar perimeter pests, may be found or where they may enter premises. Apply to baseboards, storage areas, and other locations.

Outdoors

See above for complete mixing instructions.

For Perimeter Barrier Treatments

To help prevent infestation of buildings, apply to a band of soil and vegetation 6-10 ft. wide around and adjacent to the building. Also, treat the building foundation to a height of 2-3 ft. where pests are active and may find entrance. Apply as a coarse spray treatment to thoroughly and uniformly wet the foundation and/or band area, using 1-5 gals. of treatment solution applied to 800-1600 sq. ft.

Outdoor Surfaces

Apply with either hand-held or power application equipment as a residual spray to surfaces of buildings, porches, screens, window frames, eaves, patios, lawns, refuse dumps, garages and other similar areas where these pests are found. Also, may be used as a spot treatment in applications to lawns in landscaped areas in and around residential, commercial, institutional and industrial buildings, and similar areas where these insect pests are active.

Fire Ants (Mounds)

For individual fire ant mounds, apply Demon WP as a drench. Gently sprinkle a total of one gallon over the surface of mounds up to 12 inches in diameter. Use 2 gallons for larger mounds. Thoroughly wet mound and surrounding area. Treat new mounds as they appear. Pressurized sprays may disturb the ants and cause migration. If possible, applications should be made on warm days after recent rainfall. All colonies in the vicinity should be treated, including those that have not yet constructed a mound.

Scorpions

Treat and remove accumulations of lumber, firewood and other materials that serve as harborage sites. Apply as a coarse spray treatment to the point of drip.

  • Demon WP is not appropriate for applications using a hose-end sprayer.
  • See product label for complete outdoor application instructions.

Demon WP Insecticide Features

  • Water-soluble packets are convenient and simple to use.
  • Pet safe after dry, when used as directed.

Extra Tips

  • Some settling may occur after tank mixing Demon WP. Be sure to agitate the tank after resting, and only mix the amount of product you intend to use within 24 hours.
  • Store concentrate out of direct sunlight and extreme temperatures for maximum shelf life of 3+ years.
  • Not labeled for use on edible plants.
  • Exposure to direct sunlight will break down residual more quickly, so applications may need to be made more frequently in these areas.
  • Repeat treatments as necessary, but not more than once every 7 days.
  • Demon WP is not suitable as a space spray with equipment such as misters, foggers, or aerosol equipment. The product will clog or damage the equipment and is not labeled for this use.
Review Search   
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  • 5 of 5 Stars

    Phenomenal Product

    By Matt on 06/02/2009

    Verified Purchase

    Excellent product. I have been using Demon WP Insecticide for MANY years mostly for exterior barrier treatment and in and around garages. I was very impressed. I will never forget the first time I used this product. I sprayed a heavy line in front of our 3 car garage which was getting bombarded by all kinds of crawling insects. It created about a 10-12" line on a hot & sunny day and it dried very quickly. I did it a second time thinking it evaporated, again it dried within a few mins. Came home from work the next day and a solid line of dead bugs exactly where I sprayed. Was as if it was an invisible electric fence. At this point I was sold on this and nothing else. I have continued to use it for years without fail. I found it lasts quite a while but depends on how much direct rain the treated surface area gets. Recommend 100% 

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    771 of 810 people found this review helpful

  • 5 of 5 Stars

    Awesome

    By George on 03/22/2009

    "It just works" says it all. I have been using Demon WP Insecticide for 10 years. Forget what you read about multiple applications per year. Maybe outside, but inside, unless you wash or vacuum it away, it lasts forever. I haven't used it in 2 years indoors and it's still killing. I thought, after two years, though, another application couldn't hurt. The first time you use it, when you wake up the next morning, you will be in awe of the dead insects in your house. Just do every base board, even in cabinets and closets and every threshold into your house, garage, carport, etc...threshold exteriors need to be repeated if exposed to the elements. This stuff is the last word in pest control. Don't waste your money on supermarket and building supply store junk and pest control companies that come out and use this same stuff, and bill you $250.

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    699 of 729 people found this review helpful

  • 5 of 5 Stars

    This stuff is awesome!

    By Kevin on 08/28/2007

    I have 2 large dogs in my house. Had fleas really bad. I tried every type of bug bomb- Home Depot, Lowes, and Walmart had and it seemed like they multiplied. My parents turned me on to this product Demon WP. I sprayed my baseboards, windows, doors, weep holes in the brick, the entire perimeter of the house, the soffit on the house, and the perimeter of my yard. After all that, I still had 2 pouches left, so I went ahead and sprayed my lawn. I have not seen another live bug in the house for 2 years. I may not have applied it the way I'm supposed to, but this stuff is awesome. Highly recommended.

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    551 of 578 people found this review helpful

  • 5 of 5 Stars

    Try it and you will be satisfied!

    By Chris on 02/21/2006

    I have used Demon WP and I know it works . If you have a roach problem in your home this will kill them and will keep killing for months . It goes on wet and dries to a powder . You will be seeing dead roaches in 24 hours and 1 application will last months of killing power . It is safe too, I have pets and a small child and have never smelled or had a problem like pest control services cause . Try it and you will be satisfied.

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    452 of 468 people found this review helpful

  • 5 of 5 Stars

    Try this product!

    By Joyce on 07/06/2008

    Verified Purchase

    Great product!!  I've been using this product for 2 years and living by the ocean, we have our fair share of palmetto bugs, roaches and every crawly bug known to man. Demon WP keeps the house insect-free and considering I have a bug phobia, this means a great deal knowing that there aren't any unwelcome pests crawling around our home. Anyone having a problem with bugs should try this product...you'll be glad you did!!

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    308 of 338 people found this review helpful

See all 1,143 customer reviews

Questions & Answers

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Q
Will Demon WP Insecticide kill Ceratopogonidae- biting midge?

Will this product kill noseeums- Ceratopogonidae- biting midge--- Desperate!!!! They are in our yard-- we do live in the woods-- I also have children and pets-- how long should they stay out of the yard if the product does in fact kill these insects.

A

Demon WP will kill Midges that come in contact with it. It cannot be applied as a broadcast, however. Talstar P would be a great product for you. Spraying a product such as Talstar P on window screens, doors, bushes, and plants around your home can act as midge repellant to keep midges away. Citronella candles or oils can act as a midge repellant, but they aren’t as effective when used alone. Talstar P is safe for children and pets after dried. 

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Q
Will Demon wp kill roaches and their eggs
A
Demon WP will kill roaches but it will not kill roach eggs. Insecticides will only kill insects after they have hatched from the eggs. Insecticides cannot penetrate the egg shells. We would recommend using an Insect Growth Regulator such as Gentrol IGR along with the Demon WP as it can make some of the eggs non-viable and it will halt the reproduction of the juvenile roaches.

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38 of 41 people found this answer helpful

Q
Does Demon WP kill bed bugs and eggs?

I'm wondering if this product will kill bed bugs I recently purchasedd a rv and it is infested with bed bugs I've tried everything nothing works. If so how often should I apply it and how long it will take for them to die

A
Demon WP is not labeled for bedbugs. We offer bedbug kits that contain all of the different products you need to eliminate bedbugs and re-treatments should be done every 7-10 days until you do not receive a bite for 30 days.  We also highly recommend using mattress and boxspring encasements to help eliminate bedbug infestations. These bedbug proof covers will trap existing bedbugs and eliminate hiding places and make inspections easier. Please see our How to Get Rid of Bed Bugs page learn more about eliminating bedbugs.

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176 of 218 people found this answer helpful

Q
Do I need to rotate products if using Demon WP?

It is currently recommended to alternate insecticides with different modes of action against the pest so that no more than two consecutive applications are made with the same MOA. This is to minimize Insecticide Resistance. What is a good product to use in a rotation with Demon WP? How long should one wait before applying a second product after Demon?

A

It is always a good practice to alternate products with different active ingredients. A great alternative to Demon WP would be something like Suspend SC. Suspend SC is a general insecticide that is labeled for various pests, including roaches, mosquitoes, ticks, fleas, etc. This can be used indoors and outdoors around the perimeter of your home. We would recommend 30 days between applications of different products.

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17 of 18 people found this answer helpful

Q
Is Demon WP safe for my 10 month old daughter?

If my daughter was to touch the area I put this after it has dried and then licked her hand or something would she be ok?

A
Demon WP like any other product we sell is very safe as long as you follow the application instructions.  When you mix Demon or any other product on our site with water, the solution is only strong enough to kill small insects.  It would be advised to not apply where your daughter will come in contact with it easily.  First off, 99%  of all bugs come from outside so you should apply most of your product around the outside perimeter of the house where you do not have to worry about your daughter coming close to it.  Inside, you should apply the product in cracks and crevices, underneath and behind appliances, window sills, where pipes go into the walls underneath sinks and behind toilets, etc....places that are hard for your daughter to get to.

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3 of 3 people found this answer helpful

Q
I am applying Demon WP in the kitchen cabinets, how long after I spray can I put my dishes back in?
A
Once Demon WP is dry, is it okay to put your belongings back into the cabinets. Depending on how thoroughly you sprayed the cabinets and how much residue is left behind - It is up to you if you want to wipe it out as well before replacing your belongings.

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29 of 32 people found this answer helpful

Q
Will Demon WP kill wolf spiders?

I have wolf spiders that love to hang around my pool. I have noticed holes along the concrete. I assume this is where they are living. Will Demon WP work or can you suggest a different product?

A
Demon WP is great for all insects, including spiders.  It will do a great job for wolf spiders as well as all other insect control.  You should apply Demon WP once a month for maximum effectiveness. 

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5 of 5 people found this answer helpful

Q
How often should I re-treat indoors for roaches?

I sprayed inside my home 2 weeks ago for cockroach treatment and Demon WP worked great. Last night, I began seeing cockroaches in my house again. Should I spray again?

A
You can spray once a month indoors with Demon WP. We recommend you use Demon along with a couple of other products, an insect growth regulator to help halt the breeding cycle and a roach bait gel to eliminate roaches in cabinets, drawers and other hidden areas where spraying is not appropriate, to get rid of the roaches for good. Demon does work great but it cannot be sprayed in many of the places roaches hide and that is where the other products come in.

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6 of 6 people found this answer helpful

Q
Is Demon WP okay to use on carpet?

I wanted to to know if it was okay to get some on the carpet that meets the baseboards? Since its a wet able powder didn't know if it would clump up or anything!

A
Demon WP is only labeled to be used as a crack and crevice treatment along the baseboards. If you have the option use a pin stream setting on your sprayer, you should get a direct stream and it would not spray on the carpet areas. It is possible it will leave some white residue on the carpet but we have not heard of any clumping. Please let us know if you have any further questions.

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3 of 4 people found this answer helpful

Q
Pre or post guests? Firewood?

I have guests coming to stay, and I know they have the large roaches. Should I spray this and an IGR Before the guests arrive? Or wait until after they leave? I used to use Demon WP and an IGR for fleas but haven't in a few years (will need to check expiration dates). I have an elderly cat and kitten I will keep out of the area until very dry- how long??

A
You can spray Demon WP Insecticide with the IGR before the guests arrive. The dry time usually takes a couple of hours. 

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Demon WP Insecticide 5 out of 5 stars Rating: 4.8 (1,143 Reviews / 526 Q&A)

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