Demon WP Insecticide

$8.99 - $94.80

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4.5 out of 5 stars Rating: 4.7

846 Reviews | 339 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 WP can be purchased as either an envelope of four water-soluble packets (shown here) or a Demon WP 1 lb. jar (equal to 12 envelopes of Demon) with a scooper for easily making up to 48  gallons of solution. 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   724
4 stars   73
3 stars   19
2 stars   11
1 star   19

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Average Customer Rating
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Most Helpful Customer Reviews
  • 453 of 483 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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  • 411 of 431 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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  • 335 of 357 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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  • 245 of 258 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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  • 176 of 202 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  Long Time User
    By Ron in Houston TX on 07/27/2017

    Very satisfied with product results over many years. Definitely kills our Texas roaches. Use it mostly outside and sometimes in attic. My local supplier went out of business and this was my first purchase from DoMyOwn. Fair price and super response time on order.

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  • 5 of 5 stars  Demon WP and DoMyOwn
    By Jerry in Santa Fe Texas on 07/27/2017

    Great product and 2nd time I bought from here, fast shipping .

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  • 5 of 5 stars  Highly Recommend
    By Kelly in Cincinnati, Ohio on 07/21/2017

    I've used Demon WP for the last three years in my home. I sprayed one afternoon and by the next morning (after those night time crawlers come out) there were dead bugs everywhere! This product is excellent and I highly recommend it!

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  • 5 of 5 stars  Perfect Easy to Use Solution
    By Marlene in Saint Petersburg, Florida on 07/18/2017

    I have been using this product since moving to Florida. I have resolved the Florida bug problem within my home to perfection. I spray approximately twice a year inside and out. I do re-enforce the doorways when I know I am having guests from out of state as they are not used to closing doors... quickly enough.

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  • 5 of 5 stars  This stuff works!
    By Some in somewhere Illinois on 07/17/2017

    I use it around the foundation of my house in the spring and fall to kill crickets and spiders. We had a really bad problem in the fall with crickets getting into the basement and chirping all night and day it was very annoying! I bought this just as cricket season was starting and sprayed thoroughly around my foundation and a little bit in the corners in my basement. We did not have ANY crickets chirping and found dead spiders in the basement where i sprayed in the corners.

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  • 5 of 5 stars  Easy to use
    By R. in Englewood, Fl on 07/16/2017

    Easy to store in individual packets. No offensive order.

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  • 5 of 5 stars  Great Insecticide
    By Karen in Fort Myers,Fl on 07/16/2017

    Used this product for first time on the various insects in SW Florida..Very pleased with results..Will definitely use again as part of my monthly regime to keep these nasty insects at bay..

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  • 5 of 5 stars  Rating on Demon Insecticide
    By Richard in Dalzell, Sc on 07/13/2017

    I haven't used your product yet as I still have some I purchased some time ago. It is the same kind so It should be the same results. The Demon I used worked real good. Had lots of Dead Cockroaches all around the House the next morning.

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  • 5 of 5 stars  Simply The BEST
    By King in Atlanta on 07/05/2017

    Ever since using Demon WP I never have a problem with bugs my dog had fleas and my house was infested I sprayed Demon and my goodness does it work.

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  • 5 of 5 stars  Demon WP works great
    By Mark in Bella Vista, AR on 07/03/2017

    Use this regularly and the only bugs you will see will be dead ones. Great residual killing power. DoMyOwn also gets five stars for value and quick shipping!

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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. 

297 of 322 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.

205 of 222 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.

169 of 180 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. 

154 of 160 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.

111 of 118 people found this answer helpful.
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Most Recent Customer Questions

07/11/2017 Steve from Moody

QDoes Demon WP Insecticide kill flea eggs /larvae?

A

Demon WP Insecticide†will kill adult fleas outdoors only 1-2 days †after the lawn is mowed. It is mixed at 1-2 packs per gallon of water per 1,000 sq ft. Please take a few moments to review our article/videos on How to Get Rid of Fleas for a successful eradication program.

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11/28/2016 Samuel from Harlingen, Tx

QDo I put the closed package of Demon WP in water and will it dissolve the package?

A

There are 4 water soluble packets in an envelope of Demon WP. You will dissolve the packet as is in the water for application after removing from envelope.

6 of 6 people found this answer helpful.
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11/23/2016 Shannon from Troup

QHow do I clean my cabinets after using Demon WP?
My hubby sprayed the kitchen backsplash and countertops for ants. I have used soap and water, but I am still getting a yellow tinted paper towel while drying. How do I clean Demon from my countertops and backsplash?

A

When using Demon WP on any surface you can use soap and water to get the product off of where it was applied. This should be sufficent to get the residue off. If you are having issues we suggest contacting the product manufacturer Syngenta at 866-796-4368.

3 of 3 people found this answer helpful.
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11/20/2016 Ch from Sf Bay Area, Ca

QCan Demon WP be used for bark beetles?
I would like to protect our ailing oak from further bark beetle damage. Can I spray the trunk once per month in the dry season, May - October? I'd guess they would only come in contact with it when they land or when they emerge (which is too late). Is there a better product, perhaps more of a repellent?

A

Unfortunately, Demon WP is not labeled for bark beetles. We would recommend a product like Tengard SFR One-Shot Termiticide. Per the product label to prevent an infestation to trees and woody ornamentals, you would thoroughly spray the bark but not to the point of runoff.†

2 of 2 people found this answer helpful.
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11/20/2016 Cynthia from Austin, Tx

QIs Demon WP recommended for silverfish?
How often?

A

Demon WP Insecticide†would be a great product for silverfish. †It should be applied once a month outside and once every 3 months inside. †We have a great video that shows where to spray for perimeter and interior spraying. Please click on the link here to see the video. †We also have a great guide here for controlling them that might help.

1 of 1 people found this answer helpful.
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09/13/2016 Bill from Jacksonville, Fl

QWill Demon WP work for ants?

A

Demon WP†will kill just about any insect, including all types of ants.†However,†Demon WPwill 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.

2 of 2 people found this answer helpful.
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09/07/2016 Dayton from Prattville, Al

QWill Demon WP kill house flies?

A

Yes, Demon WP will kill houseflies that come in contact with the treated surfaces. Please review our treatment article on How to Get Rid of Flies for a more successful eradication program.

2 of 2 people found this answer helpful.
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09/02/2016 Nancy

QCan you spray Demon WP Insecticide on the base of a tree?

A

Yes,†Demon WP Insecticide†can be applied on the base of a tree if needed for listed insects.

1 of 1 people found this answer helpful.
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08/11/2016 Randy from Texas

QIs Demon WP safe to use on my boat house and dock?

A

Yes, Demon WP is safe for use in and around your boat house and/or†dock. Be sure not to use this product in areas that will come in contact with water. If it comes in contact with water, it will harm the invertebrates there.†You will use 1-2 packets per gallon of water.†

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08/10/2016 Heather from Abilene

QWill Demon WP hurt my horses?
I have really bad fire ants in my pasture .

A

Demon WP is not labeled to be used in pastures. Extinguish Fire Ant Bait is labeled to be used in pastures where horses graze.† You can use this product on pastureland, however you must remove all grazing livestock for at least 48 hours after application. Then they can return to the land after 48 hours.

1 of 1 people found this answer helpful.
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