Demon WP Insecticide

$8.99 - $94.80

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NY residents, see our New York Pest Control page.

5 out of 5 stars Rating: 4.8

896 Reviews | 393 Q&A

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Demon WP Insecticide envelope (4 x 0.3 oz)

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Demon WP Insecticide

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.




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.

Always read the product label completely before use.

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.

* 1 scoop is the equivalent of 0.33 oz., 9.5 gm., or 2 level tablespoons

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.

Rating Snapshot

5 stars   771
4 stars   74
3 stars   20
2 stars   11
1 star   20

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Average Customer Rating
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Most Helpful Customer Reviews
  • 511 of 544 people found this review helpful:

    5 of 5 stars  Phenomenal Product
    By Matt in Burnsville, North Carolina 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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  • 478 of 500 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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  • 378 of 402 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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  • 286 of 299 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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  • 200 of 226 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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Most Recent Customer Reviews
  • 5 of 5 stars  purchesing of Demon WP
    By Efrain in Florida on 01/12/2018

    This product is very good and safe if used according to instructions. I have used several times and its woek for me. Shipping is fast, i'm very satisfied and will recommend this vendor and product.

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  • 5 of 5 stars  I see why they named it DEMON
    By Carol in Texas on 01/01/2018

    If you want to kill bugs this stuff is powerful. Be very careful not to get it on anything you will eat (near fruit trees or food, for example) or near water such as ponds and lakes, or runoff onto gardens. Our cedar tree had carpenter ants that were killing it. One treatment of this stuff and I watched the ants march out of the tree by the thousands, and the next day all dead on the ground.

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  • 5 of 5 stars  Demon WP Insecticide
    By Patrice in Jacksonville, Florida on 12/10/2017
    Verified Purchase

    I reordered this insecticide because I have used it before. I appreciate the information that you give on your website about this insecticide. I was so impressed with the results that I gave some to my daughter who have also ordered the Demon WP insecticide. It has worked way beyond by expectations. I will reorder soon. Thank you.

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  • 5 of 5 stars  Demon WP
    By Mike in Jesup, Ga. on 12/01/2017

    This stuff is great. Kills roaches immediately and keeps on killing for months.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Recommend this product
    By Shai in Danville il on 12/01/2017

    Works great, leaves white stain on wood. Light smell, best if used gentrol. Started seeing bugs a couple hours after spraying. Best product I have came across so far

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  • 1 of 1 people found this review helpful:

    4 of 5 stars  Excellent
    By Sharon in West Monroe on 11/24/2017

    This stuff works wonders on fleas in my dogs pen.

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  • 2 of 2 people found this review helpful:

    5 of 5 stars  DemonWP
    By Gale in Orangeburg,SC on 11/21/2017

    I ordered the 4 pack. It is awesome. I spray for roaches and spiders. No more of the big roaches that come in from outside. This is the best product I have ever used, and I am telling other people about it. I will order again if I need it

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  • 2 of 2 people found this review helpful:

    5 of 5 stars  DEMON WP INSECTICIDE
    By G.w. in KINGMAN, ARIZONA on 11/17/2017

    I used cyper wp to control black widow problems, and it works better than anything I've ever used. Now that it's no longer available, I tried demon wp, and the results are just as good as the cyper wp, thank god. Thanks for such a reliable product. I only wish it came in one gallon powdered containers like the cyper wp did. Packets only, but hey, it still works. Thanks.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  demon wp
    By Johnny in Eastman georgia 31023 on 11/15/2017

    I've been using this product for around 15 years plus. Best I ever used. Don't waste your money in the stores you will be well pleased and don't expect to see it happen over night, give it two weeks, I guarantee you want buy anymore from any store. Don't take my word for it, just try it.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Have used this product for years and highly recommend it
    By E in Punta Gorda on 11/10/2017

    We use this and appreciate its effectiveness and have recommended it to others

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Most Helpful Q&A's

05/16/2010 Tim

QIs Demon WP children safe when sprayed inside the home?

ADemon WP is safe to use around children and pets when mixed and used correctly.  With most professional products such as Demon WP, once you mix it with water it is only strong enough to kill small insects.  You should always keep children and pets away from where you are treating.  Once the product has time to dry which usually only takes 30 minutes, it is safe for children and pets to re-enter the room.  Of course you should always keep any pesticide or cleaning product out of reach of children. 

366 of 394 people found this answer helpful.
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07/17/2010 Diane

QIf you don't use the Demon WP mixed with water, will it still be good to use later?

ADo not mix Demon WP until you are ready to use it and never mix more than you can use at one time. Demon WP should be used within 24 hours after being mixed with water.

242 of 260 people found this answer helpful.
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03/11/2010 Jim

QCan Demon WP be sprayed on the outside of a home and still be effective?

A

Demon WP is labeled for both indoor and outdoor use. Apply Demon WP to exterior door frames, window frames, places where utilities (cables pipes and wires) enter into the structure, eaves, soffits, around the bottom of the foundation and out onto the ground several feet. If you have an existing insect infestation, you may also need to spray indoors around the door frames, window frames, places where utilities (cables, pipes and wires) enter into the structure and around the baseboards. Demon WP will last for about 4 weeks outdoors and about 12 weeks indoors.

201 of 213 people found this answer helpful.
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10/11/2011 Christy from San Antonio, Texas

QWhat is the difference between Demon WP and Demon MAX?

ADemon Max is made by the same company that makes Demon WP and they both contain the same active ingredient.  The main difference is Demon Max is more intended for use as a termiticide to treat and protect homes against termites.  Demon WP is more for insect control inside and outside homes. 

188 of 195 people found this answer helpful.
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08/01/2009 Jim

QHow 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.

140 of 149 people found this answer helpful.
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Most Recent Customer Questions

12/29/2017 Lia from Austin, Tx

QWhat is the consequence of using a mixture of Demon WP from a few months ago?
I mixed Demon WP with water to use a few months ago but I mixed far too much. I am not sure how to dispose of it and was told I could reuse it...

A

Using diluted Demon WP after it has been mixed 24 hours or longer would not be advised. The reason being is that the active ingredient will start to break down and cause the solution to become less effective. You can pour the old mixture outside, right up against the foundation of the structure you are treating.

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12/19/2017 Vicki from Albertville, Alabama

QWhat is the cost of Demon WP?

A

The current price for Demon WP Insecticide is $8.99 per envelope, or $94.80 for a box of 12 envelopes.†

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11/17/2017 Ted from Auburn

QDoes Demon WP kill on contact or does it take a few minutes?
German roaches

A

Demon WP Insecticide is not a contact kill; this product is a residual and can take up to one week before seeing results. We would suggest doing treatments every 21 days while treating for an active roach infestation.

Please take a look at our Roach Guide for tips on how to treat and prevent roaches in the future.

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11/03/2017 Don from Canyon Lake, Tx

QIs it okay to spray Demon WP on Limestone blocks skirting around your house?
Does it break down the material of the Limestone block

A

Demon WP should not damage limestone or any rock or other surface. Demon WP does leave a visible white residue on darker surfaces, but that should not leave any permanent stain. We recommend testing a small area first if you are concerned about this residue.

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10/19/2017 Crystal from Houston,tx

QIs Demon WP a good substitute for Cynoff WP?
I have a roach infestation and was looking for Cynoff WP, but I see it's been discontinued. Is Demon the same thing?

A

Cynoff WP is actually a generic version of the†Demon WP Insecticide.† Both products†contain the same active ingredient and work the same way.††

Please take a moment to look over our guide on How To Get Rid Of Roaches for advice on the best ways to treat and prevent roaches.†

1 of 1 people found this answer helpful.
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10/16/2017 Mayra from Amarillo, Tx

QIf I mix Demon WP Insecticide and don't use it all, can I save it to spray later?

A

No,†Demon WP†should be used within 24 hours after being mixed with water.

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10/04/2017 Wayne from Nacogdoches, Tx

QDoes Demon WP kill lice?
I think it's obvious you can't use Demon WP on your body, but would it kill lice on furniture and things like that?

A

Demon WP Insecticide is not labeled for lice or to be applied for furniture.† Steri-Fab Insecticide would be a better option.† It can be applied to couches, chairs and other upholstered furniture.†

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10/03/2017 Lena from Hershey, Pa

QWill Demon WP kill millipedes?

A

Yes, Demon WP can be used to control millipedes and dozens of other common crawling and flying pests. Be sure to check for ways to reduce moisture buildup in the environment to create an environment less favorable for these insects, such as pulling back groundcover and trimming plants near the foundation of structures.

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09/20/2017 Holly from Conroe, Tx

QCan Demon WP Insecticide be used for mange mite?

A

Demon WP Insecticide†cannot be applied to animals.†We do carry†Happy Jacks Kennel Dip II†which is labeled for mange mites.

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09/09/2017 Beth from Rockmart

QWill Demon WP kill book lice in books and papers?
I had some books stored in a plastic sterling tub during the summer in Ga. Now, they are infested with book lice. I sprayed Demon WP inside a trash bag, added said books and papers, and sealed the bag. Will this likely kill adult and hatchling book lice if I leave it sealed for a month?

A

No, Demon WP is not labeled for booklice.†

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