---
product_id: 2621759
title: "Demon WP Insecticide 2 Envelopes Containing 4 Water-Soluble 9.5 Gram Packets Makes 4 Gallons Cypermethrin 40%"
brand: "syngenta"
price: "S$39"
currency: SGD
in_stock: true
reviews_count: 6
category: "Syngenta"
url: https://www.desertcart.sg/products/2621759-demon-wp-insecticide-2-envelopes-containing-4-water-soluble-9
store_origin: SG
region: Singapore
---

# 90+ day residual power Covers up to 2,500 sq.ft. per gallon Water-soluble 9.5g packets Demon WP Insecticide 2 Envelopes Containing 4 Water-Soluble 9.5 Gram Packets Makes 4 Gallons Cypermethrin 40%

**Brand:** syngenta
**Price:** S$39
**Availability:** ✅ In Stock

## Summary

> 👹 Demonize pests, not your lifestyle — unstoppable protection that lasts!

## Quick Answers

- **What is this?** Demon WP Insecticide 2 Envelopes Containing 4 Water-Soluble 9.5 Gram Packets Makes 4 Gallons Cypermethrin 40% by syngenta
- **How much does it cost?** S$39 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/2621759-demon-wp-insecticide-2-envelopes-containing-4-water-soluble-9)

## Best For

- syngenta enthusiasts

## Why This Product

- Trusted syngenta brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-lasting Knockdown:** Delivers over 90 days of continuous pest control—stay protected season after season.
- • **Precision Mixing Packets:** Four easy-to-dissolve 9.5g water-soluble packets per envelope for hassle-free, mess-free application.
- • **Broad-Spectrum Pest Defense:** Kills ants, roaches, spiders, mosquitoes, and over 30 other common and stubborn pests on contact.
- • **Versatile Indoor & Outdoor Use:** Effectively targets a broad spectrum of pests both inside your home and around your yard.
- • **Cost-Effective & Efficient Coverage:** One packet mixed with a gallon of water treats up to 2,500 sq.ft., making it ideal for large homes and properties.

## Overview

Syngenta Demon WP Insecticide is a professional-grade, water-soluble powder containing 40% Cypermethrin that provides rapid knockdown and over 90 days of residual pest control. Each envelope includes four 9.5g packets designed for easy mixing, covering up to 2,500 sq.ft. per gallon. Suitable for indoor and outdoor use, it targets a wide range of pests including ants, roaches, spiders, and mosquitoes, delivering reliable, long-lasting protection for your home and garden.

## Description

Syngenta Demon WP Insecticide 2 Envelopes Containing 4 Water-Soluble 9.5 Gram Packets Makes 4 Gallons Cypermethrin 40%

Review: Surpassed my expectations! - We have been using Ortho home bug spray for several years now in order to keep a roach, scorpion & spider problem under control. We hadn't really seen many roaches inside our house, except an annoying few during the night in our kitchen. The real problem was out in our back yard & back part of the house where there are prominent cracks in the foundation (old house) & less traffic. In the yard we have flies as well that we could not get rid of easily on our garbage cans (I tried insect spray, but once it gets wet from rain or the sprinklers outside it stops working). Well, I had read about Demon WP online searching for a way to get rid of Black Widow spiders & many people reviewed this product to kill many different bugs right on contact including black widows. Thankfully desertcart has it here because it isn't available in my town. The first spraying I just did a few choice spots to see if it would really work ( I was skeptical). I used 2 packets in a one gallon sprayer. The next morning we found a couple dozen bugs inside the back part of our house & the outside area were where the masses were dead. Impressive. So, I mixed up just one packet in a gallon sprayer & went around the inside & outside again focusing on all the cracks, perimeter & missing nothing. The next morning we found more bugs than the first time. Now it has been a week since my initial spraying & we are still finding dead bugs, roaches, beetles, ants, spiders, moths & flies to name a few. Now I had the idea to spray our rental home that is semi vacant. There was a take over by black widow spiders in that house. It took one packet in a one gallon sprayer, full inside perimeter & just the area outside where the spiders were taking over, including the front porch perimeter. Next morning & every other morning after that we continue to find dozens of bugs dead before they made it into the front door, including the black widow spiders. That cleared up the bug problem. I had no idea this stuff would continue to work as well as it is. In the past we have tried sprays, powders & mixes that bugs became immune to or that quit working once it got wet from rain or the sprinklers. Demon WP does not stop killing bugs & when I say it kills bugs, I do mean it kills in masses if that's what you have crawling around your house like we did. I've re-ordered this larger pack, because the price to mix my own comes out less than buying a gallon of already mixed spray (that doesn't work as well). My plans now are to share this with my family who are having a serious bug problem & live in an old, cracked house with many places for bugs to hide. I would not recommend this to my family if it did not work. This stuff works better than any store bought product I have tried in many, many years & for the first time we do not have bugs in our patio, porch, or even the back parts of our house. We can sit outside & not be attacked by a crawly thing. Amazing feeling to know that one simple powder mix can & does eliminate a bug problem quickly as it does. Keep in mind that if you have a really bad problem with bugs, you will need to spray occasionally to keep the numbers down. I am going to continue spraying as well, too. One comment on the odor, this to me has no odor & does not burn my skin if I spill it on me. (be careful to wear gloves & keep away from your face though). Great product, excellent price & like the reviews state this stuff works.
Review: BEST pest control ON the MARKET!!!!👌❤️🙌❤️👍 - Ran into a friend who worked for an expensive pest control business in Florida!!!💀 Asked him to come spray my house. He told me to NEVER pay a pest control place EVER again!! TO USE??? 🤨 THIS stuff instead!!! 🙌👀 Exact SAME THING HIS company used!!😳 And I AM here TO TELL YA!!! 🙋🏼‍♀️ I have NEVER looked back!!!! 🙌 And THAT was 30 YEARS ago!!!!👀❤️👍 House 🏠 built right next TO mine. And when I tell you that the AMOUNTS OF BUGS🐛🕷️🐜🦗 THAT turns UP???😳 YOU WOULD move BACK UP NORTH!!!!☠️🙌😂 NOOO joke!! BUT with Demon 👿 WP???🤔 I NEVER HAD ONE BUG, IN MY house, ALIVE!!!!🙌 Might have made it IN my house but never lasted more than a few minutes, ALWAYS just twitching AND dying!!!💀☠️💀👌 I even got German COCKROACHES IN MY house🤬, from a pediatric patients backpack 🎒 and the DEMON 👿 EVEN KILLED THOSE puppies!!!!🙌 (Notoriously IMPOSSIBLE TO GET rid of, btw!!) Florida bugs ARE a totally DIFFERENT breed!!🙄👎 I CANNOT RECOMMEND DEMON WP TO you HIGH ENOUGH!!! 🙌❤️👍👌 IT IS THEE ONLY THING I'VE EVER USED SINCE!!!🙋🏼‍♀️ While it does leave a milky residue once dried, I'd MUCH RATHER THAT OVER ANY "live" BUG 🐛 IN my house!!!!👌❤️👍 And it's beyond affordable and waaaay BETTER than ANYTHING ELSE ON the market!!!!🙌❤️👌 I've owned several houses and it's BEEN 100% EFFECTIVE, EVERY SINGLE TIME!!!☠️❤️👍😁👌 EASY TO use as well!!!🙌 JUST a simple gallon sprayer, drop the saran wrap tube (WHY it's called "WP" MEANING wettable powder!! Do NOT 🚫 TOUCH WITH WET hands!!!🙄👎😬🤦🏼‍♀️ I'm an idiot 🙋🏼‍♀️ and DON'T READ instructions until AFTER I screw things UP!!🙄👎😂) USE JUST ONE tube for maintenance and use TWO tubes per gallon for INFESTATIONS!!!👍 JUST SHAKE TO dissolve and start spraying!!!!👌❤️ Generally cost is around $24 FOR a 4 TUBE PACK!!! SAYS TO "Spray/use either monthly or every 3 months" (can't remember🙄 sorry) But I NEVER HAVE!!👌 JUST once or twice a YEAR!!!👀🤯👍 (I think they just tell YOU that so you use AND BUY MORE!!💰💰💸😂) But EVEN IN FLORIDA??!?🤨 I've NEVER needed TO spray THAT often!!!❤️👌 You WON'T be sorry if you get this stuff!!!🙌 Just CAN'T use on food prep surfaces and around fish tanks and KEEP pets AND kids AWAY FROM the areas UNTIL the spray HAS COMPLETELY DRIED!!!!👌❤️ Highly, HIGHLY RECOMMEND!!!!🙋🏼‍♀️👍❤️👌❤️🙌 (AND NO, I DON'T have ANY affiliation, investment or connection TO the product, seller OR the manufacturer!!!👎 I'm JUST a normal, regular consumer just like the rest OF you!!!🙋🏼‍♀️❤️👌 Just trying TO help YOU get RID OF bugs too!!👍) Also CAN use INDOORS AND OUTDOORS!!🙌❤️👌(IF you made it THIS far!!!😂)

## Features

- Quick knockdown and long-lasting - 90+ day residual
- Can be used inside and out
- Size: 1 Envelope contains Four 9.5 gram water soluble packets
- Yield and Mixing: One 9.5g packet mixed with 1 gallon of water covers a 2,000 to 2,500 sq.ft. home.
- Target Pest: Ants, Aphidsc, Assassin Bugs, Boxelder Bugs, California Oakworm, Centipedes, Chiggers, Chinch Bugs, Cockroaches, Crickets, Earwigs, Elm Leaf Beetlec, Firebrats, Fleas, Flies, Millipedes, Mites, Mosquitoes, Pillbugs, Silverfish, Sowbugs, Termitese, Bees, Carpenter Ants, Carpenter Bees, Fire Ants,¤Ԥ¸¤Á¤­corpions, Sod Webworms, Spiders, Ticks, Wasps

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002Y6DNCK |
| Active Ingredients | Cypermethrin |
| Best Sellers Rank | #1,238 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #41 in Insect & Pest Repellent Sprays |
| Brand | Syngenta |
| Customer Reviews | 4.7 4.7 out of 5 stars (9,791) |
| Is Discontinued By Manufacturer | No |
| Item Form | Powder |
| Item Weight | 1.4 ounces |
| Item model number | 74819 |
| Liquid Volume | 1 Gallons |
| Manufacturer | syngenta |
| Product Dimensions | 6 x 3 x 0.25 inches |
| Target Species | Insects |
| UPC | 702941748194 |

## Product Details

- **Active Ingredients:** Cypermethrin
- **Brand:** Syngenta
- **Item Form:** Powder
- **Item Weight:** 1.4 Ounces
- **Liquid Volume:** 1 Gallons

## Images

![Demon WP Insecticide 2 Envelopes Containing 4 Water-Soluble 9.5 Gram Packets Makes 4 Gallons Cypermethrin 40% - Image 1](https://m.media-amazon.com/images/I/415WmWLhIJL.jpg)

## Questions & Answers

**Q: I have 2 young kids.  Is it safe to spray this inside the house (around baseboards).  Getting ants this winter.**
A: I cannot say anything about the ants but I managed to exterminate cocroaches who are the great survavals. The substance have no smell and did not influence the state of health anyway ,though I used it all around the kitchen floor in all the corners and crevices.Nither of my family members complained. I had to repeat the spraying a couple of times until all the disabled creatures died out. I think that the substunce is magic. Very glad that I was recomended to use it.

**Q: Whats the difference in this active ingredient (cypermethrin) and Cyfluthrin?**
A: Cyfluthrin belongs to a class of insecticides known as synthetic pyrethroids. ... Cypermethrin belongs to a class of insecticides known as synthetic pyrethroids, found in Cynoff EC, Cynoff WP, Cyper TC Termiticide, Cyper WP, and Demon WP pesticide concentrates.   But that info really won't help you .      what product are you trying to compare with demon wp?   cy-kick?  

Both Cykick CS and Demon WP are great products.  When sprayed, Cy-Kick CS creates a thick barrier of microcapsules that is impossible for insects to cross without being exposed to a lethal dose of insecticide. Exposed insects pick up microcapsules on their hairs and body triggering a rapid release of the active ingredient, resulting in death. Cy-kick’s active ingredient Cyfluthrin is a pyrethrin, which means it is user-safe, environment friendly, and less likely to cause skin irritation than other active ingredients. Cy-kick CS is virtually odorless, and will not create a visible residue or stain when used according to the recommended label rate. 16 oz.

Demon WP insecticide is a wettable powder that is mixed with water. It can be applied as a crack and crevice and/or spot treatment for residual and contact control of ants, bees, biting flies, boxelder bugs, centipedes, cockroaches, crickets, earwigs, elm leaf beetles, firebrats, fleas, flies, millipedes, mosquitoes, pillbugs, silverfish, sowbugs, spiders, ticks, and wasps. Demon WP will leave a white residue on dark surfaces.   Cy-kick won't

**Q: My daughter has a bad infestation of roaches. Will this work?**
A: Best to use Maxforce magnum roach bait gel and gentrol point source igr discs Or advion roach bait gel and gentrol point source igr discs.   For roaches inside.

**Q: Does this keep stink bugs and keep them away?**
A: Yes, I spray all around my house, screens, doors etc and they stay away or die shortly after. None have made it indoors in 2 years.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Surpassed my expectations!
*by C***Y on August 29, 2012*

We have been using Ortho home bug spray for several years now in order to keep a roach, scorpion & spider problem under control. We hadn't really seen many roaches inside our house, except an annoying few during the night in our kitchen. The real problem was out in our back yard & back part of the house where there are prominent cracks in the foundation (old house) & less traffic. In the yard we have flies as well that we could not get rid of easily on our garbage cans (I tried insect spray, but once it gets wet from rain or the sprinklers outside it stops working). Well, I had read about Demon WP online searching for a way to get rid of Black Widow spiders & many people reviewed this product to kill many different bugs right on contact including black widows. Thankfully Amazon has it here because it isn't available in my town. The first spraying I just did a few choice spots to see if it would really work ( I was skeptical). I used 2 packets in a one gallon sprayer. The next morning we found a couple dozen bugs inside the back part of our house & the outside area were where the masses were dead. Impressive. So, I mixed up just one packet in a gallon sprayer & went around the inside & outside again focusing on all the cracks, perimeter & missing nothing. The next morning we found more bugs than the first time. Now it has been a week since my initial spraying & we are still finding dead bugs, roaches, beetles, ants, spiders, moths & flies to name a few. Now I had the idea to spray our rental home that is semi vacant. There was a take over by black widow spiders in that house. It took one packet in a one gallon sprayer, full inside perimeter & just the area outside where the spiders were taking over, including the front porch perimeter. Next morning & every other morning after that we continue to find dozens of bugs dead before they made it into the front door, including the black widow spiders. That cleared up the bug problem. I had no idea this stuff would continue to work as well as it is. In the past we have tried sprays, powders & mixes that bugs became immune to or that quit working once it got wet from rain or the sprinklers. Demon WP does not stop killing bugs & when I say it kills bugs, I do mean it kills in masses if that's what you have crawling around your house like we did. I've re-ordered this larger pack, because the price to mix my own comes out less than buying a gallon of already mixed spray (that doesn't work as well). My plans now are to share this with my family who are having a serious bug problem & live in an old, cracked house with many places for bugs to hide. I would not recommend this to my family if it did not work. This stuff works better than any store bought product I have tried in many, many years & for the first time we do not have bugs in our patio, porch, or even the back parts of our house. We can sit outside & not be attacked by a crawly thing. Amazing feeling to know that one simple powder mix can & does eliminate a bug problem quickly as it does. Keep in mind that if you have a really bad problem with bugs, you will need to spray occasionally to keep the numbers down. I am going to continue spraying as well, too. One comment on the odor, this to me has no odor & does not burn my skin if I spill it on me. (be careful to wear gloves & keep away from your face though). Great product, excellent price & like the reviews state this stuff works.

### ⭐⭐⭐⭐⭐ BEST pest control ON the MARKET!!!!👌❤️🙌❤️👍
*by C***. on May 24, 2025*

Ran into a friend who worked for an expensive pest control business in Florida!!!💀 Asked him to come spray my house. He told me to NEVER pay a pest control place EVER again!! TO USE??? 🤨 THIS stuff instead!!! 🙌👀 Exact SAME THING HIS company used!!😳 And I AM here TO TELL YA!!! 🙋🏼‍♀️ I have NEVER looked back!!!! 🙌 And THAT was 30 YEARS ago!!!!👀❤️👍 House 🏠 built right next TO mine. And when I tell you that the AMOUNTS OF BUGS🐛🕷️🐜🦗 THAT turns UP???😳 YOU WOULD move BACK UP NORTH!!!!☠️🙌😂 NOOO joke!! BUT with Demon 👿 WP???🤔 I NEVER HAD ONE BUG, IN MY house, ALIVE!!!!🙌 Might have made it IN my house but never lasted more than a few minutes, ALWAYS just twitching AND dying!!!💀☠️💀👌 I even got German COCKROACHES IN MY house🤬, from a pediatric patients backpack 🎒 and the DEMON 👿 EVEN KILLED THOSE puppies!!!!🙌 (Notoriously IMPOSSIBLE TO GET rid of, btw!!) Florida bugs ARE a totally DIFFERENT breed!!🙄👎 I CANNOT RECOMMEND DEMON WP TO you HIGH ENOUGH!!! 🙌❤️👍👌 IT IS THEE ONLY THING I'VE EVER USED SINCE!!!🙋🏼‍♀️ While it does leave a milky residue once dried, I'd MUCH RATHER THAT OVER ANY "live" BUG 🐛 IN my house!!!!👌❤️👍 And it's beyond affordable and waaaay BETTER than ANYTHING ELSE ON the market!!!!🙌❤️👌 I've owned several houses and it's BEEN 100% EFFECTIVE, EVERY SINGLE TIME!!!☠️❤️👍😁👌 EASY TO use as well!!!🙌 JUST a simple gallon sprayer, drop the saran wrap tube (WHY it's called "WP" MEANING wettable powder!! Do NOT 🚫 TOUCH WITH WET hands!!!🙄👎😬🤦🏼‍♀️ I'm an idiot 🙋🏼‍♀️ and DON'T READ instructions until AFTER I screw things UP!!🙄👎😂) USE JUST ONE tube for maintenance and use TWO tubes per gallon for INFESTATIONS!!!👍 JUST SHAKE TO dissolve and start spraying!!!!👌❤️ Generally cost is around $24 FOR a 4 TUBE PACK!!! SAYS TO "Spray/use either monthly or every 3 months" (can't remember🙄 sorry) But I NEVER HAVE!!👌 JUST once or twice a YEAR!!!👀🤯👍 (I think they just tell YOU that so you use AND BUY MORE!!💰💰💸😂) But EVEN IN FLORIDA??!?🤨 I've NEVER needed TO spray THAT often!!!❤️👌 You WON'T be sorry if you get this stuff!!!🙌 Just CAN'T use on food prep surfaces and around fish tanks and KEEP pets AND kids AWAY FROM the areas UNTIL the spray HAS COMPLETELY DRIED!!!!👌❤️ Highly, HIGHLY RECOMMEND!!!!🙋🏼‍♀️👍❤️👌❤️🙌 (AND NO, I DON'T have ANY affiliation, investment or connection TO the product, seller OR the manufacturer!!!👎 I'm JUST a normal, regular consumer just like the rest OF you!!!🙋🏼‍♀️❤️👌 Just trying TO help YOU get RID OF bugs too!!👍) Also CAN use INDOORS AND OUTDOORS!!🙌❤️👌(IF you made it THIS far!!!😂)

### ⭐⭐⭐⭐⭐ Fire ant war
*by V***. on January 11, 2026*

Over the years I’ve tried everything there is to get rid of fire ants in my yard living in the country. This product works extremely well, you spray some on the ant mound and they disappear over a few days, works great. Also works good for scorpions, fire ants, cockroaches, and other bugs. Just mix or instructions.

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-05*