Demon WP Insecticide

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Not for Sale to: NY, CT
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4.7 Rating: 4.7

676 Reviews | 289 Q&A 

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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.


Active Ingredient: Cypermethrin 40%
Target pests: ants, carpenter ants, cockroaches, crickets, spiders and certain other insect
* See label for complete list
Application: Demon WP leaves a white powdery film that is especially noticeable on dark surfaces
Yield: 1 envelope contains 4 water-soluble packets and makes 2-4 gallons of solution.
Formulation: Professional Product
NOT FOR SALE TO: NY, CT
Manufactured 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   573
4 stars   65
3 stars   13
2 stars   10
1 star   15

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Average Customer Rating
4.7 star rating (676 reviews)

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Most Helpful Customer Reviews
  • 245 of 268 people found this review helpful:

    5 of 5 Stars  Phenomenal Product
    By Matt in Burnsville, North Carolina on June 2, 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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  • 225 of 235 people found this review helpful:

    5 of 5 Stars  Awesome
    By George on March 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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  • 165 of 179 people found this review helpful:

    5 of 5 Stars  This stuff is awesome!
    By Kevin on August 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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  • 124 of 131 people found this review helpful:

    5 of 5 Stars  Try it and you will be satisfied!
    By Chris on February 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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  • 109 of 126 people found this review helpful:

    5 of 5 Stars  Try this product!
    By Joyce on July 6, 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  Great product ! Works well on spiders & scorpions
    By Carla in El Paso, TX on August 23, 2015

    I live in the Texas desert where scorpions & spiders live. I haven't see any kind of bug since spraying Demon around my house. Great product. I will be a lifetime buyer of Demon.

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  • 5 of 5 Stars  This product works !!
    By J. in so. cal ,high desert on August 19, 2015

    Used as per instructions,for crack and crevice,24 hrs after application I had a patio littered with DEAD and dying roaches. Dead roaches continue to crawl out and die after 4 weeks. I will continue to use it and recommend it highly !!

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  • 1 of 1 people found this review helpful:

    3 of 5 Stars  Demon
    By Glenn in Houston TX on August 19, 2015

    This works really good on spiders & such. We are trying it on crazy ants. Nothing we have used works very good very long. If you have any suggestions on how to control crazy ants, please let us know.

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  • 5 of 5 Stars  Demon WP for cluster flies
    By J in Lansdale, Pa. on August 18, 2015

    I battled cluster flies for 4 years using fly traps and another insecticide and didn't even dent the population. It's been 2 weeks since I sprayed Demon WP and still no flies!

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  • 5 of 5 Stars  Great product
    By Bryan in Cleveland, Georgia on August 16, 2015

    It takes about 4-5 days to start noticing dead bugs but will last for a long time. The other brand that supposedly has the same two main ingredients doesn't work as good. I have several rental properties and the folks at Do My Own Pest Control help me out if I ever have questions too.

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  • 5 of 5 Stars  Demon WP believer
    By Cesar in Littleton, CO on August 7, 2015

    In the late 1970's a friend recommended us DEMON WP for a 20 yr old house in Houston full of pests. For over 15 years we used this pesticide twice a year (ouside and only corners inside the house ... all corners) and lived free of roaches, ants, spiders, and other pests. We now live more than 15 years in Denver and we still believe, depend on, and use Demon WP. Four packets last us two years.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  No More Bugs!
    By Bradley in Dothan, AL on July 7, 2015

    I was having trouble with Roaches, Palmetto Bugs on and around my screened in porch. I used another pruduct, but they did not go away. I ordered Demon WP and sprayed on the porch, all around the porch, and even treated what I could reach of nearby oak trees. It has been about a month now, and I have not seen a single bug on our porch or around the house. So far, I am very pleased with this product and will purchase more in the future.

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  • 5 of 5 Stars  Great Product!
    By John in Palm Bay, FL on July 7, 2015

    I've been using Demon for several years and have found it to be very effective against these pesky Florida insects, both inside and outside. This is the same product a lot of pest control companies use. You can hire them, or do it yourself. Do My Own Pest Control has the best prices, as well as quick delivery. I wouldn't consider buying anywhere else. Instead of paying $35-$50 a month for a service, you can do it yourself for just pennies. It's a "no-brainer."

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Hands down best insecticide
    By Sarah in PLANTERSVILLE, TX on July 5, 2015

    I've used this several times and it has kept all insects away for at least a year at a time with one application. I haven't sprayed in a long time, but it has rained almost constantly for months now, and for the first time in 3 years I'm seeing a roach problem so I'm about to use it again. I have a small house, but I can do my whole house inside and out with less than the 4 packets that come inside the bag. The bags are less than $15 (4 packets) which is extremely comparable to other insecticides that are much less effective. You won't be disappointed!

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  • 1 of 1 people found this review helpful:

    4 of 5 Stars  Took care of our scorpion problem
    By Michelle in El Paso, TX on July 5, 2015

    Product was easy to use and so far since spraying the foundation and 3 feet up the side of the house no scorpions have gotten in. I only gave 4 stars because I do not know how long the protection will last. But 5 stars if I never see another one in the house!

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Most Helpful Q&A's

September 6, 2009 Scott asked:

QIs Demon WP safe around children and pets?

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. 

245 of 252 people found this answer helpful.
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May 16, 2010 Tim asked:

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. 

88 of 100 people found this answer helpful.
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July 17, 2010 Diane asked:

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.

73 of 83 people found this answer helpful.
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August 31, 2009 Daniel asked:

QDoes Demon WP kill fleas?

A

Demon WP does kill adult fleas, but it will not effect flea eggs or other stages.  It is always adviseable to mix an IGR (Insect Growth Regulator) with the product you are using. An IGR mixed with Demon WP will help slowdown the reproduction process and yield better results. Demon WP is also only labeled to treat fleas outside as it cannot be applied as a broadcast treatment indoors (where fleas will be present). For indoor flea treatment products, please click the link below.

 

Indoor Flea Treatment Products

66 of 73 people found this answer helpful.
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March 11, 2010 Jim asked:

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.

60 of 68 people found this answer helpful.
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Most Recent Customer Questions

July 21, 2015 Red from Foothill Farms, Ca asked:

QIn California, how can I properly dispose of Demon WP that is much older than 5 years?
On 7/1/15, you said that Demon WP will last up to 5 years if stored in a cool, dry place. Mine is over 10 years old.

A

You should contact your nearest waster disposal facilites for the specific disposal protocol of Demon WP in your area. 

0 of 1 people found this answer helpful.
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July 19, 2015 Ramon from Texas asked:

QCan I use Demon WP on painted surfaces of my house?

A

Demon WP should not cause any damage to paint, but it may leave behind a faint white residue on darker surfaces.  

1 of 1 people found this answer helpful.
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July 13, 2015 Bruce from Glenolden asked:

QHow much Demon WP Insecticide comes in each envelope?
So each envelope contains 4 packets correct? And 2 packets are recommended for roaches, so 2 gallons worth out of each envelope right?

A

You are correct, there are 4 packets of Demon WP Insecticide per envelope. For roaches, you should mix 2 packets per gallon of water. See the product label for complete applications. Please review our Roach Treatment Guide for more tips about roach control.

1 of 1 people found this answer helpful.
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July 11, 2015 Bill from Willows Ca. asked:

QCan anybody buy Demon in California?

A

Demon WP and Demon Max are not restricted for shipment to California. You do not have to be licensed in the state to purchase and treat your own home with these products. Please let us know if you need anything else.

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July 1, 2015 Richardson_sheila13 from Richardson_sheila13@yahoo.com asked:

QWill Demon WP kill bed bugs?

A

Demon WP is not labeled for bedbugs. We do carry bedbug kits that will be effective for treatment.

 

Bedbug Control Article

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July 1, 2015 Judy from Mustang, Ok asked:

QI purchased several packages of Demon is 6/2006 are they still good, they were stored in a dry dark cupboard.

A Demon WP Insecticide if stored in a cool dry area will last for up to 5 years. So, you would need to order fresh product.

1 of 1 people found this answer helpful.
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June 28, 2015 Mod from Fresno, California asked:

QWhat's stronger cypermuthrin or cyfluthrin?

A The amount of the actual ingredient in the product you are referring to will depend on which is stronger. Generally, we would recommend products for different types of insects.

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June 28, 2015 Mod from Fresno, California asked:

Qwhat works better on German cockroach, tempo wp or demon wp?

A Tempo Ultra WP and Demon WP are both labeled for various types of roaches. They have two different active ingredients in them, which is the main difference. We would not recommend using just one product to control roaches. A bait gel and IGR (insect growth regulator) should be added to ensure that you are maintaining control of the roaches.

3 of 3 people found this answer helpful.
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June 26, 2015 Greg from Texas asked:

QIs Demon WP labeled for Bed Bugs

A Demon WP is not labeled to kill bed bugs. If you are looking for a liquid concentrate that is labeled to kill bed bugs, Temprid SC is a great product that we recommended for bed bugs. We offer Temprid SC in our complete Bed Bug Kits that come with a number of products recommended to perform a full bed bug treatment.

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June 25, 2015 Pat from Waco Tx asked:

QHave flies inside of house, how do I use Demon WP inside?

A When using Demon WP inside it is only labeled to be used as a crack and crevice treatment only.  Other products are more recommended and we have an article here that would give great advice.

1 of 1 people found this answer helpful.
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