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
Which is better for cockroach control, Demon WP or Suspend SC?
A

That is a hard question to answer because both work very well.  However, we do sell the Demon WP in our Roach Control Kits and it does work a little faster and provides a punch for quick knock down.  Sprays alone usually do not work.  You should use this along with a Roach Bait so the roaches have something to take back in the walls and other hiding places that you do can not spray.  Our Roach Control Kits have a very high success rate and incorporates sprays and baits.

Roach Control Information

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97 of 105 people found this answer helpful

Q
I want to spray outdoors and indoors, but I have a dog in the house. What product is safe to to both jobs?
A
Demon WP is an excellent product for indoor and outdoor use. However, it does leave a powdery residue because it is a wettable powder.

If you are looking to a general pesticide spray, we would recommend Bifen IT. It is an amazing insecticide that is good for various pests, such as spiders, roaches, mosquitoes, etc. It can be sprayed indoors along the baseboards and cracks and crevices. Outdoors it can be sprayed around the perimeter of your home, on ornamentals and trees as well. This is not labeled for edibles. It is also safe once it is dry and dries clear so your pet will not see it. Mopping or getting where you sprayed wet does not affect the product.

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4 of 6 people found this answer helpful

Q
Will Demon WP clog up regular backpack sprayers - unless they have special diaphram pumps?
A
No, Demon WP will not plug up your sprayer, at least initially.  You definitely have to mix wettable powders very well before applying it.  You should fill the sprayer half way with water, scoop in the proper amount of product or drop in the Demon WP envelope, place the top on the sprayer and shake vigorously, then remove the top and fill the sprayer the rest of the way with water.  The sprayer should work fine but you should only mix what you plan on using that day.  Wettable powders will clog a sprayer when the solution is left in the sprayer overnight or for a long period of time.  The powder will settle, become clumpy at the bottom of the sprayer, and will clog the sprayer when you try to re-use it.  So only mix what you are going to use right then and you should have no problems.

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86 of 90 people found this answer helpful

Q
Will Demon WP kill tarantulas?

I have tarantulas in my yard and in the wash room. Will this product kill them?

A
If the tarantulas are sprayed directly with the Demon WP or come in direct contact with the treated area, they will, given enough time, die. Demon WP does not offer an immediate knockdown, but instead a long residual. Spiders in general are harder to kill than other insects because their bodies are higher off the ground and they do not groom their legs(the part of them that actually comes into contact with the insecticide) and therefore take longer to receive a lethal dose of the insecticide. Spraying Demon WP will also help to get rid of the insects that spiders feed on and that will help to stop new spiders from moving in. Indoors, spray around all baseboards, door frames, window frames, under appliances, in closets and storage rooms and in areas where utilities enter into the structure. Outdoors you should spray around the bottom of the foundation, on the ground adjacent to the foundation, door frames, window frames and places where the utilities enter into the structure.

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6 of 7 people found this answer helpful

Q
How toxic is Demon WP to fish and dogs?

I have a pond with catfish approx. 50 yards from my house and during hard rains water runs off form the house area into the pond. I'm having a big problem with scorpions.

A

Demon WP is not a problem to use around pets as long as you apply it according to the product label. Once Demon WP is mixed with water, it is only strong enough to kill small insects. You would not want to leave the jar of Demon WP open where dogs could get into a large quantity of it. It is always a good idea to keep pets and children out of the area while you are treating. Once the product dries, usually after 30 minutes, it is perfectly fine to allow pets and children back in the area. However, all pesticides are very dangerous to fish and aquatic life. You would not want to use Demon WP or any other pesticide near a body of water. 50 yards away is a good distance, but if the land sloped down towards the pond, then there may be a concern. If it does not, it should not be a problem to treat around your home that is 50 yards away from the pond.

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329 of 364 people found this answer helpful

Q
Can I use Demon WP Insecticide for fleas in some areas of the yard?
A

Mix one packet of Demon WP Insecticide  to one gallon of water and make sure it dissolves completely before you begin spraying. This mixture will treat 1,000 sq ft and you will need to re-treat every 14 days (do not treat daily) as needed for flea control.  Most folks find they have to do between 2-4 treatments to get rid of the fleas for good along with the use of an IGR such as Archer IGR. You may want to look over our Flea Treatment Guide for more tips and information.

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Q
Does Demon WP Insecticide work for German roaches?
A

Demon WP Insecticide  is labeled for German roaches however will only kill roaches that come into contact with the treated area and does not have any transfer qualities which is important in eliminating an active roach infestation. This is not a contact kill and take 1-3 weeks to kill the roaches that have contacted the treated areas.

The best treatment for German Roaches as they reproduce quickly and in large numbers would be to use a combination of products along with diligent repeat treatments every 14 days.

Please view our Roach Control Kits and Roach Treatment Guide for more information. 

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Q
Will spraying Demon on sand in a sandy barn work to eliminate fleas?

My barn cat had kittens. While she is treated the 8 kittens are not and cannot be until a certain age. In just a couple weeks the flea population has grown greatly. I want to get this under control before it becomes a bigger problem. The barn floor is just sand and I'm trying to determine if I can spray it directly on the sand floor in the entire barn. Thanks

A

While Demon WP can be used on sandy soils for fleas, it should not be used alone.  We would recommend adding an IGR such as Archer or Nyguard along with it.  This will help prevent young flease from maturing into reproducing adults.  Wondercide Flea & Tick Control Pets & Home - Lemongrass can actually be used on the kittens regardless of age.  It is all natural and non toxic.  If this is an indoor barn, then we would recommend using a product labeled for this use such as the Wondercide or Onslaught Insecticide.

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2 of 2 people found this answer helpful

Q
Will Demon WP work on all types of ants?

I have sugar, red and carpenter ants. Will Demon WP get rid of all of them?

A
Demon WP will kill just about any insect, including all types of ants.  However, Demon WP will only kill the ants that walk over where you treat around your home.  It will not take care of the queen and other ants back where the colony is.  The key to ant control is to use a product that will not kill the ants around your home on contact like Demon WP will, but a product that they will take back to the colony and kill the queen and other ants at the source.  Our most popular product for this is Termidor SC.  Or, you can use ant baits that the ants will eat and take back to the colony.  Otherwise, you will be battling the ant colony all summer long.

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61 of 67 people found this answer helpful

Q
Can I use Demon WP, Maxforce magnum and Gentrol all at once or should i use them all at different times?
A
You can use them all at once.The Maxforce Magnum should be applied by placing one small pea sized dot every 10-12 inches directly into cracks and crevices around counters, sinks, drawers and cabinets. You should use one Gentrol Point Source disc for every 75 sq ft of space. In order to know how many discs you should use you would need to know the square footage of the room (multiply the length of the room by the width of the room) (If you have the Gentrol Liquid you can mix it in the same gallon of water as the Demon and spray them together indoors). Demon WP should be sprayed outdoors around door frames, window frames, in areas where utilities (cables, pipes, wires) enter into the structure, around the bottom of the foundation and other areas where insects are known to harbor. Inside you should apply Demon WP along baseboards, in cracks and crevices,under appliances, around door frames, window frames and in areas where utilities (cables, pipes, wires) enter into the structure.

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5 of 5 people found this answer helpful

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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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