Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)

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Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY) Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
4 of 5 Stars!  Customers reviews (40)
SKU: L0033
Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
1 envelope(s)
Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
2 envelope(s)
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Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
3 envelope(s)
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Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
1 Box (12 envelopes)
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Demon WP is a long-lasting residual insecticide that uses a knockdown method, providing control over crawling pests such as ants, roaches, crickets, spiders, and other insect pests, for up to 3 months. Demon WP is odorless and can be used both indoors and outdoors for crack & crevice and/or spot treatments.

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Customers Reviews(40)
Questions & Answers(28)

DEMON WP Insecticide - 1 Envelope

Syngenta's Demon WP is an odorless, water-soluble insecticide that delivers quick knockdown and lasting residual control of over 30 pests. The product contains 40% Cypermethrin, one of the most reliable pyrethroids to control indoor and outdoor pest infestations. Demon WP is available in convenient 1-lb jars with scoops and in envelopes which greatly reduces the efforts of mixing. One pound of the product makes up to 50 gallons of finished solution.

Why Should You Use DEMON WP?

Demon WP is a broad label insecticide providing fast kill and long-term residual control at a lesser cost.

Target Pest(s): Ants, Aphids, Assassin Bugs, Boxelder Bugs, California Oakworm, Centipedes, Chiggers, Chinch Bugs, Cockroaches, Crickets, Earwigs, Elm Leaf Beetles, Firebrats, Fleas, Flies, Millipedes, Mites, Mosquitoes, Pillbugs, Silverfish, Sowbugs, Termitee, Bees, Carpenter Ants, Carpenter Bees, Fire Ants, Scorpions, Sod Webworms, Spiders, Ticks and Wasps
Manufactured By: Syngenta
Active Ingredient: Cypermethrin - 40.0%
Size: 1 Envelope (4 x 9.5g)
Yield/Application: 9.5g per 1 gal. of water
Not For Sale To: CT, NY

Directions for DEMON WP Use

Demon WP is in the form of soluble powder that is intended for water dilutions. Following the dilution rates found in the product label, add measured amounts of Demon WP to water to produce the desired amount of solution. Compatible pesticides may be mixed together with the product unless prohibited by the product label. Use the finished solutions for surface treatments, crack and crevice treatments or spot applications. Apply solutions using handheld or powered sprayers, crack and crevice injectors or paint brushes.

Permitted areas of use in nonfood/nonfeed areas include, but are not limited to: aircraft (cargo and non-cabin areas only), apartment buildings, boiler rooms, buses, closets, correctional facilities, decks, entries, factories, fencing, floor drains (that lead to sewers), food granaries, food grain mills, food manufacturing, processing and serving establishments; furniture, garages, garbage rooms, greenhouses (non-commercial), hospitals (non-patient areas), hotels and motels, houses, industrial buildings, laboratories, livestock/poultry housing, landscape vegetation, locker rooms, machine rooms, mausoleums, mobile homes, mop closets, mulch, nursing homes, offices, patios, pet kennels,porches, railcars, restaurants, storage rooms, schools, sewers (dry), stores, trailers, trees, trucks, utility passages, vessels, vestibules, warehouses, wineries, and yards.

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

Where to Apply DEMON WP

For use by commercial applicators in, on and around buildings and structures for the control of listed pests, including on lawns, ornamental trees and shrubs around residential, institutional, public, commercial, agricultural and industrial buildings; and parks, recreational areas and athletic fields.

Demon WP may be used as a general surface, crack and crevice and/or spot treatment in the non-food areas of food handling establishments. Examples of non-food areas include garbage rooms, lavatories, floor drains (to sewers), entries and vestibules, offices, locker rooms, machine rooms, boiler rooms, garages, mop closets, and storage (after canning or bottling).

Do not use Demon WP in food areas of food handling establishments, restaurants or other areas where food is commercially prepared, processed or served. Food areas include areas for receiving, storage, packing (canning, bottling, wrapping, boxing), preparing, edible waste storage and enclosed processing systems (mills, dairies, edible oils, syrups). Serving areas (when food is exposed and facility is in operation) also would be considered a food area.

Please refer to and follow the instructions on the Product label.

Customer Reviews of Demon WP Insecticide - 1 Envelope (NOT FOR SALE IN AK,CT,NY)
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1 of 5 Stars! (1/5)    Review by   Ivette Mejia  (Posted on )

Purchased product
I am very dissatisfied with the product that I purchased from this company. I have a cockroach problem at home and thought I would get rid of it with your product. The demon did not work and it seems that my problem got worse I see more cockroaches now.

1 of 5 Stars! (1/5)    Review by   Bill D.  (Posted on )

Shocked by fast delivery!
When my order arrived I couldn't think what it may be. I hadn't ordered anything in the past week, except the day before from Pestmall. Sure enough it was my order, at my door, in less than 24 hours! I saved time and gas vs. driving to a retailer and got a far better price. Regarding Demon WP, I have had an exterminator only one time in 33 years at this house other than for termites. Demon controls roaches from pine trees which are everywhere in Atlanta. I estimate I've saved over $6000 vs. my neighbors who use a pest service.

2 of 5 Stars! (2/5)    Review by   KenSpen  (Posted on )

Demon WP
Fast delivery. Great product!

4 of 5 Stars! (4/5)    Review by   Adam  (Posted on )

The best pest stuff around, for stopping insects of all kinds!

1 of 5 Stars! (1/5)    Review by   James Shaw  (Posted on )

Demon WP Insecticide
I'm glad you sent this e-mail. I was not going to bother contacting you over a few dollars. When I opened the box you sent via USPS I was suprised to see only the container with the premis. I am unable to review the Demon WP as I never received it! I turned the shipping container inside out to make sure I did not miss it, but sadly who ever prepared the order did not include it in box. Thanks.

Reply : We apologize for the confusion. If you have received a Premise product instead of the Demon WP that you have ordered, we will gladly replace it for you. Please contact us at or feel free to give us a call at 1-888-543-4142.

3 of 5 Stars! (3/5)    Review by   PJ  (Posted on )

The Best
I have used this product for many years. Always bought at the local Feed Store. Now that wee have moved it was hard to find. This is a great proiduct at a even better price. Thanks.

4 of 5 Stars! (4/5)    Review by   David  (Posted on )

So Long Spiders!!
Bought a package of Demon WP at a farm supply in Texas while visiting family. Tried it in my boat house and it eliminated the spiders after two applications. (very careful to spray on house and not in water) No ill effects noted and no more daily sweeping of webs and cleaning up spider droppings. Found Pest Mall on the web and saved several dollars vs. my store purchase and never had to leave home. Delivery was Fast and Free!! Thanks, Pest Mall, I've already recommended you to several friends.

5 of 5 Stars! (5/5)    Review by   SN  (Posted on )

Demon WP insecticide
I have used this product and I am very pleased with the is the only thing that will get the job done!!! I no longer use anything but Demon will kill anything you need to put a stop to...used to buy it at my local feed store that no longer is in business...I am thankful for Pestmall for carrying it...ordering is a breeze and delivery is fast...thank you

5 of 5 Stars! (5/5)    Review by   Chad  (Posted on )

Great Product
Works every time and for a good couple of months depending on rain etc. I have used this product many times in the past few years and it sure beats having to pay the pest guy to come out once for 70 bucks.

5 of 5 Stars! (5/5)    Review by   Bob  (Posted on )

Extremely Effective
I used this for a variety of pests and it doesn't disappoint.

3 of 5 Stars! (3/5)    Review by   Michele  (Posted on )

Best product, Best price
I've purchased this product locally where I live, because it works so well. But I'm so glad I found it here on PestMall, because your price is the BEST! Thanks so much, I'll be a repeat customer!

4 of 5 Stars! (4/5)    Review by   Michelle Ebert  (Posted on )

Good results
I ordered this product to control carpenter bees on my deck. Demon did everything promised in the literature, and as a bonus there are virtually no wasps around the house. It also works for fleas and ticks in the yard. Just remember to let it dry before letting your pets out in the yard after it is treated.

4 of 5 Stars! (4/5)    Review by   KJ  (Posted on )

Great Stuff!
I use this all over the house from roaches to fire ants Demon kills it dead!

5 of 5 Stars! (5/5)    Review by   Kb  (Posted on )

Most Effective
Years ago at my old home, I had a roach problem after first moving in. I used foggers and gels, finally bought some Demon sprayed around outside real good, sprayed in the attic, and all around inside the house. After spraying, the only bugs I found were dead and never had any more live roach encounters. I bought some more for my new home, sprayed the perimeter and around plumbing fixtures. So far so good, this stuff is the best!

5 of 5 Stars! (5/5)    Review by   Tim L.  (Posted on )

This cypermethrin stink bugs is the best. I will purchase this again. Thank you so much

5 of 5 Stars! (5/5)    Review by   miss. scott  (Posted on )

The DEMON WP Insecticide is great! I did it all by myself! I saved a lot of money! And pestmall offer free shipping!

5 of 5 Stars! (5/5)    Review by   John Lakers  (Posted on )

Demon WP Insecticide is really good, I used this few weeks ago, and like they said in the information, it is very long lasting product. It’s amazing to see a cheap product that is very effective and long lasting.

5 of 5 Stars! (5/5)    Review by   Candace A. Sweeney  (Posted on )

Demon Wp is certainly effective against ants. I had tried other expensive products, but this was the best. Will definitely buy from the seller again.

5 of 5 Stars! (5/5)    Review by   Judy Bradshaw  (Posted on )

The Demon wp envelopes work great for roaches! It has not failed me yet! haha

5 of 5 Stars! (5/5)    Review by   Monica Nash  (Posted on )

I did not like how the wettable powder was left visible on the surface, but i can’t complain because it got rid of my roach problem. Can anyone suggest something that works as great as the demon wp but dries invisible??

5 of 5 Stars! (5/5)    Review by   Allison Hodge  (Posted on )

I highly recommend this product.

5 of 5 Stars! (5/5)    Review by   Huijun K  (Posted on )

This Demon Wp works very well! We had fire ants invading our home. After applying this product inside and outside of our house, we found tons of fire ant bodies... No more ants!

5 of 5 Stars! (5/5)    Review by   Dana Perry  (Posted on )

Demon WP Insecticide is a low cost product that comes in various money saving options. It can be applied to any situations. It works on a wide range of bugs that you may come across in different seasons. Most attractive feature of it, that it’s very economical.

5 of 5 Stars! (5/5)    Review by   Abbigail Garcia  (Posted on )

I think that the problem why my results were slower than the other people who had the same infestations were because I used DEMON WP Insecticide after 20 hours after I mixed the solution with water. The next day, I used the left over I had and then I started seeing MAJOR improvements. Overall, the Demon WP was a good product if you use it right after you mix the solution into water!

5 of 5 Stars! (5/5)    Review by   Regina Richardson  (Posted on )

great product that lasts for a long time. This company also ships pretty fast so great experience overall with my purchase.

5 of 5 Stars! (5/5)    Rated by   Renee Bennett  (Posted on )

5 of 5 Stars! (5/5)    Rated by   Dwight Sherrill  (Posted on )

5 of 5 Stars! (5/5)    Rated by   Frances Hoyle  (Posted on )

5 of 5 Stars! (5/5)    Review by   R Michele  (Posted on )

The product was an excellent price and I was impressed with the free shipping. The package also arrived very quickly - all in all and extremely positive experience with Pest Mall. I will definitely recommend them!

5 of 5 Stars! (5/5)    Review by   Stanley Ryan  (Posted on )

i love how the demon wp envelopes come conveniently packaged with 4 packets that you can easily mix with 1 gallon of water. For a regular non professional user like myself it was just too easy. i loved it!! i’m already stressed enough with these darn spiders around my house... I don’t need more stress with trying to figure out the correct way to mix the darn thing.

5 of 5 Stars! (5/5)    Review by   Ted Hobbs  (Posted on )

Because the demon wp envelopes come in small packs, I don’t have to worry about safely storing them for the next year... which is the reason why I always go with the demon wp envelopes. They should really try coming out with other pesticides too in small quantities. Great marketing strategy for people like me who do not like to store pesticide inside their homes.

5 of 5 Stars! (5/5)    Rated by   Alvin Meadows  (Posted on )

5 of 5 Stars! (5/5)    Review by   Annie C.  (Posted on )

I had a roach problem at my business. I own a restaurant and the last thing I want is my customers see a roach inside my restaurant. I purchased demon wp with gentrol IGR. It worked great and killed all the roaches. The demon wp comes with 4 pouches inside so you can use it up to 4 times. I saved a lot of money and will purchase more in the future!

5 of 5 Stars! (5/5)    Review by   Bm  (Posted on )

Tried DEMON WP and immediately it started to work. My mom keeps her house very clean but was still having roach problems,she had professionals come spray and it would not solve the problem.I sprayed outside first next the inside and roaches immediately started coming out and dying. Within 2days her home was finally roach free.

5 of 5 Stars! (5/5)    Review by   Gail E.  (Posted on )

Got exactly what we ordered. Arrived in the mail very quickly. Totally satisfied. Thank you!!

5 of 5 Stars! (5/5)    Review by   Candace S.  (Posted on )

"Demon Wp is certainly effective against ants. I had tried other expensive products, but this was the best. Will definitely buy from the seller again."

5 of 5 Stars! (5/5)    Review by   C. Slover  (Posted on )

I had been having a lot of problems with stink bugs and have been looking for products to use for treatments, but like most people the amount they offered had made me very hesitate. I wanted to try the product to make sure it worked before purchasing a big qty. Then I came across Demon WP which came in envelopes so I tried and worked great it took care of the outside control for me... now just have to find one that works for inside of my home.

5 of 5 Stars! (5/5)    Review by   Fanny Lee  (Posted on )

The DEMON WP Insecticide is a great product! I'll tell you, with the use of this DEMON WP Insecticide, the ants will DIE completely! I can finally stop worrying and I can sleep in peace! It's odorless and stainless so the only clean up to do after the execution of the ants is cleaning up the ants!

5 of 5 Stars! (5/5)    Review by   Josh W.  (Posted on )

DEMON WP works really well! The fire ants in my home were gone after two days of usage! I sprayed it with the Chapin 1 gallon sprayer that my wife had purchased beforehand. It doesn't stink up the house either so it's okay to spray with your family in the house! Just let the DEMON WP do all the work!

5 of 5 Stars! (5/5)    Review by   ana maria  (Posted on )

professional products are so much better!

Do You Have a Question about this Product? Ask Our Experts!

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Q. Will it work well on ticks?
I've never tried Demon before, but have been hearing about it a lot lately. I've read several of the reviews about using it for roaches, but have yet to see anything concerning ticks or fleas. Those are my main problems, so I'm just wondering how effective Demon will be before I buy?
A.   Both ticks and fleas are on the product label for Demon WP so it will kill them on contact. If you are doing a perimeter spray, Demon WP will work fine. If you have a large yard and have to do a broadcast treatment, it may be easier to use a granule than a liquid spray. Granules will give you more coverage. Deltagard G Granules are what we recommend for tick and flea control.
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Q. demon pesticide for termite
Is this product applicable on termite carton nests?

According to the Demon WP label that termite carton nests in trees or building voids may be injected with 0.25-0.50% solution using a pointed injection tool.

Multiple injection points to varying depths may be necessary. It is desirable to physically remove carton nest material from building voids when such nests are found.

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Q. demon for roaches
Is this product applicable on restaurants?
A.   No, Demon WP is not labeled for food handling areas.
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Q. DEMON-WP is this product safe around pets (DOGS)?
A.   Yes, as long as the treated area is left to completely dry before reentry.
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Q. Demon WP 4 X 9.5 g for ant,roach, spiders
Just want to verify.....Are there (4) 9.5 grm packages included in this sale or just 1 pack?
A.   Yes. To be more specific, it is one envelope that contains 4 of the 9.5g packets.
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Q. cypermethrin products
I was just wondering what the difrence was between the red pack of demon and the blue. I ordered some and it came in the blue pack but I have see the red pack on other sites. Please help school me on this Thanks
A.   There is no difference between the content of the two. The red pack is the design for the old label. The newer one is blue, however, the product is exactly the same.
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Q. Demon WP
wanted to know if it was safe to mix Gentrol concentrate with Demon wp and if so how to mix correctly
A.   You can mix 1 oz of Gentrol IGR with 1 envelope of Demon WP and 1 gallon of water. Gentrol IGR can essentially be mixed with almost all chemicals.
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Q. Demon WP Insecticide for roach control
Hello, I bought some of this product from you a few weeks ago, and I have used it twice, and it has killed alot of roaches, but each time I spray, it seems to bring out more and more roaches(mostly little roaches), is that normal? And how often should I spray, or do you recommend something stronger? Thank you,

Well, Demon WP Insecticide is not an attractant or a lure so it will not actually lure them out.

However, normally, you will see higher activity when they are disturbed. Since Demon WP has a delay kill effect, it may be that infected roaches that have come in contact with the poison are making it back in time and disturbing the nest in some way. Also, normally, roaches will not come out when there is light. That is typically why they will scatter when the light is turned on.

However, if they were to come in contact with this pesticide or any pesticide of its like, it interrupts their internal nervous system and they cannot differentiate such things as normal routines and etc. This may also be why you are seeing more of them than usual.

Treating for roaches will really depend on the type of species that you have infesting your home. Also, indoor and outdoor control will vary a little bit and some methods will be more effective than the other depending on location and species of the roaches.

However, we would like to assure you that Demon WP is by far one of the most powerful pesticides available for a broad spectrum of crawling insects.

It would not be normal if it didn't kill any pests at all. But if you are interested in other methods of kill, please feel free to contact us again.

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Q. About a week ago recently sprayed Demon WP mixed with Gentrol in a rental. Previously,I had used Dupont Advion Gel and the tenant said it lost its effectiveness over time. I remember reading that it may not be effective when using insecticide after a gel product. If this doesn't work, what would you recommend?
A.   If you spray insecticide over the gel, the gel will definitely lose its effectiveness. You should not apply gel and contact insecticide in the same areas. If you would like to apply both, a rule of thumb would be to keep baits up high and insecticides down low. For instance, you can place baits on counters and in and under the cabinets and spray the insecticides down low on the baseboards or by the door frames. Both Demon and Dupont Advion are effective insecticides for roach control.
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Q. What is the percetage of active ingredients once diluted with the gallon of water?
A.   One scoop or one 9.5g packet to a gallon of water is 0.1%. Depending on the pest, the amount of Demon WP per water may change. Please refer to the product label for dilution rates according to the specific pest.
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>> Read all 28 Customers Questions and Answers

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