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Cynoff WP insecticide is a loose white 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. Cynoff WP has a residual of up to 3 months.
| Active Ingredient: | Cypermethrin 40.0% |
| Target pests: | Ants, cockroaches, fleas, spiders, mosquitoes, and several other pests |
| For use in: | Residential and commercial use. Not labeled for food area treatments. |
| Application: | Indoor (crack and crevice only) and outdoor. Read label carefully. Cynoff WP leaves a powdery film that is especially noticeable on dark surfaces. |
| Pet safe: | Yes, when dry |
| Yield: | 24-48 gallons |
| NOT FOR SALE TO: | NY, CT |
| Manufactured By: | FMC |
Product Documents
Active Ingredient: Cypermethrin - 40.0%
DESCRIPTION: Cynoff WP (similar to Cyper WP) insecticide is a loose white 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. Cynoff WP has a residual of up to 3 months. 1x 1lb. container of Cynoff WP yields up to 48 gallons of finished product. NOTE: Cynoff WP is the exact same product as Demon WP, but less expensive.
USE: Best applied with a 1 gallon sprayer. Apply to outside foundation and all entry points such as around windows, doors, cracks and crevices, etc. Cynoff WP is very toxic to fish. Do not apply near bodies of water or where there may be water run-off. Always read the label completely before use.
NOT FOR SALE IN: NY, CT or VT.
General Instructions
Cockroaches, Crickets, Firebrats, Silverfish, Spiders, and Ticks: Apply as a coarse, low pressure spray to areas where these pests hide, such as baseboards, corners, storage areas, closets, around water pipes, doors and windows, attics and eaves, behind and under refrigerators, cabinets, sinks, furnaces, and stoves, the underside of shelves, drawers and similar areas. Pay particular attention to cracks and crevices; also see OUTDOOR USE.
Ants: Apply to any trails, around doors and windows, and other places where ants may be found. Refer to BARRIER TREATMENT directions to prevent infestation; also see OUTDOOR USE.
Bees and Wasps: Application to nests should be made late in the evening when insects are at rest. Thoroughly spray nest and entrance and surrounding areas where insects alight; also see OUTDOOR USE.
Boxelder Bugs, Centipedes, Earwigs, Elm Leaf Beetles, Millipedes, Pillbugs, and Sowbugs: Apply around doors and windows and other places where these pests may be found or where they may enter premises. Spray baseboards, storage areas and other locations. Refer to BARRIER TREATMENT directions to prevent infestation; also see OUTDOOR USE.
OUTDOOR USE:
For 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. Apply as a residual spray either by hand or power sprayer to surfaces of buildings, porches, screens, window frames, eaves, patios, residential lawns only such grass areas adjacent or around private homes, duplexes, townhouses, condominiums, house trailers, apartment complexes, carports, garages, fence lines, storage sheds, barns, and other residential and non-commercial structures, refuse dumps, garages and other areas where pests are found.
Barrier Treatments: To help prevent infestation of buildings, apply to a band of soil and vegetation 6 to 10 feet wide around and adjacent to the building. Also, treat the building foundation to a height of 2 to 3 feet where pests are active and may find entrance. Apply as a coarse spray to thoroughly and uniformly wet the band area, using 1 gallon of spray mix per 400 square feet.
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 Best of the Best |
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18 of 19 people found this review helpful:
Kill is almost instant!
By D.j. on March 20, 2007I've used Cynoff WP as a drench for fire ants after opening the mound with rebar. I pour about a gallon down in the hole. The kill is almost instant! I also use it as an exterior spray every 3 months and it keeps out nearly all bugs! Thanks for making it available to the homeowner. I've recommended this product and your site to many friends and neighbors!
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10 of 12 people found this review helpful:
Warning does leave white residue.
By R on January 3, 2008Cynoff WP works great for roaches inside and out. Warning, since it is powder based it leaves a milky white residue where sprayed. I will use something different for inside next time (liquid based and clear drying).
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8 of 8 people found this review helpful:
The best stuff!
By Chris on February 19, 2006I must agree , this is far better than calling a pest control company, and it works very well. Cynoff WP killed my roach problem and I have not seen any roaches in 5 months. I have seen plenty of dead ones that I can scoop up and throw away. If you have roaches or other bugs causing you problems this is THE BEST STUFF . It goes on wet and dries to a power that is hardly noticeable but the main thing is it is CHEAP and it will work, you will be happy. Don't call pest control until you try this first...it will save you lots of money.
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7 of 8 people found this review helpful:
Worked great!
By Toby on October 3, 2005Cluster flies and asian beetles. I used Cynoff last year and it worked just great. I used to have our house sprayed at a cost of over $225/year. Now I do the spraying myself and save a bundle.
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6 of 6 people found this review helpful:
This Stuff is Fantastic; Works Great!
By Joyce on May 26, 2010
Verified Purchase
I was skeptical at first when my husband ordered because I never heard of the product (and thought was a little pricey) but it really works. We used it to eliminate wasps that build nests under our porches and siding, and were surprised to see the results. Spiders and other bugs were falling out, along with the wasps. We will definitely use this product again.
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best stuff ever
By Jay on May 20, 2013 Verified Purchase
Just used this product on a hive. Probably the best product I have bought over the internet. Within a day the entire thing was dead. Plus it used so little out if the container it seems like I have enough to last a lifetime. This stuff works.
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Earwig Control with Cynoff WP
By Teresa on May 19, 2013 Verified Purchase
Earwigs was my worst nightmare but I soon investigated how to get rid of the nasty pest. I saw the website: DoMyOwnPestControl.com and found the chemical Cynoff WP. I have made those creatures dry up and Die, lol. Thank you DoMyOwnPestControl for helping me. This also takes care of other pest in or around your home. A GREAT BUY!!! You will be pleased!
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1 of 1 people found this review helpful:
CYNOFF
By Vernon on April 11, 2013 Verified Purchase
I believe this is some of the best bug and spider and ant killer that I have ever got . My daughter told me about it and I tell every one that I know about it
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1 of 7 people found this review helpful:
Cynoff WP (Cypermethrin)
By George on February 18, 2013 Verified Purchase
I was using RAID (Ant & Roach) aerosol spray, which is 0.1% imiprothrin, and Cypermethrin 0.1% with the balance 99.8 inert ingredients. I was very impressed with the effectiveness of this product, it kills instantly on contact. But is expensive. When I red that Cynoff was 40% cypermethrin, and comparing the price vs the gallons of product that the manufacturer sujests you can make, it seemed like a good idea. Altough I have a Masters degree in Analytical Chemistry and 35 years experience (retired), never for a moment doubted the product claims. I bought it and the Premium Pro Sprayer and disolved one scoop in 1-1/4 gal (full) water shook it, presurised it and went to work. Results, Absolutely, positively nothing. the roaches walked by bathe in it laughed at it and walked away. I suspected the reason, so I went and checked some MSDS's and there it was The solid Cypermethring is insoluble in water. (solubility is 99 mg/Lt) this is 99 thousands of 1 gr per Lt. So essentially you are spraying the roaches with water. No wonder it does not work. Cypermethring only disolves in organic solvents such as for example petroleum distillate. Absolutely flaberrgasted with the ignorance of the people who formulate the product. I intend to get a refund.
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cynoff wp
By Lori on January 27, 2013I have been usind this great stuff for about a year i have sprayed 3 homes that had roaches left from past renters this is a fantastic product i decided to do my own pest control when a local bug company charged me 500.00 dollars to treat one place of yours no more does leave a white powder residue only down fall but kills roaches love it
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2 of 2 people found this review helpful:
best deal
By d on January 13, 2013 Verified Purchase
After having a professional spray with no change. I read the reviews on cynoff wp, gave it a try and its been 2 weeks since i sprayed at my own liesure, and we havent seen a live roach since. I would highly recommend cynoffwp and DoMyOwnPestControl.com, for the quality and speedy delivery.
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Best Stuff for any creepy crawler !
By Larry on November 29, 2012 Verified Purchase
this stuff is the best there is - I used to use Diazinon - but can't find it anymore - but this keeps the lawn pests away for a month - and if you get a lot of rain, then you will have to spray this stuff on your lawn again. bottom line: it works.
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Cynoff WP
By Jon on October 11, 2012First time using cynoff for DIY, but pros had used at our home for years in Phoenix. Delivered quickly and product is just as described on website and very easy to use with a simple home/garden sprayer! Paid for itself in 2 months and will probably last _2 years. No white residue left on concrete or stucco.
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1 of 1 people found this review helpful:
Great for scorpions
By David on October 1, 2012Since they took Dursban off the market this is the best product I have found to keep scorpions out of the house.
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1 of 1 people found this review helpful:
Cynoff WP
By Larry on September 4, 2012used to spend thousands at home depot & Lowe's - til I found out about this stuff. I don't waste my money at Lowe's anymore.
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July 30, 2011 Craig asked:
QWhat is the mixing ratio of Cynoff WP with water?
( I lost the instructions )
ACynoff WP can be mixed at a rate of one level scoop per gallon of water, or two level scoops per gallon of water. Most pest problems require only one scoop per gallon. If you are treating for bees, wasps, scorpions, roaches, or carpenter ants you would use two scoops per gallon. We also do have the Cynoff WP instructions on our website.
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May 2, 2010 Mark asked:
QIs Cynoff WP safe to use with babies and kids?
AYes. Unless other wise noted, the pesticides on our website are safe to use in a home with children. As with any product, it is important to follow the label instructions and precautions to ensure safety. Cynoff WP should be used as a crack and crevice treatment indoors.
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April 2, 2011 Wayne asked:
QMy house eaves were sprayed with Cynoff and some spray might have drifted down on some small tomato plants.
I washed them off. Would there be any residue when they finally bear fruit 3 months from now?
ASince Cynoff WP only lasts about 30 days outside, you should be fine if your fruit is 3 months away from being harvested. Also since you washed them off initially you should be fine.
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March 11, 2010 Natasha asked:
QIs Cynoff WP safe to use around your pets?
AYes, Cynoff WP is safe to use around your pets as long as you follow the product label. All pets need to be out of the area when you apply Cynoff WP and they cannot return until the product is dry, usually about 1 hour.
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December 13, 2012
Manny from Yuba City, Ca asked:
QI have an ant, earwig, and spider problem would this product work best for all three?
AYes, Cynoff Wp is a great product to use as it is labeled to treat ants, earwigs, and spiders. You may also, want to check out our Complete Ant Kit, as we recommend using an ant bait to eradicate many different types of ant colonies.
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January 2, 2013
Linda from Prairieville Louisiana asked:
QCan cynoff wp be used on vegetable garden or fruit trees?
No
ACynoff WP cannot be used on any type of edible plants or trees. We do have a wide variety of insecticides that can be used in gardens and on fruit trees and you can see them here: Edible Garden Products
May 1, 2012
Robert from Lawton, Ok asked:
QWill Cynoff WP kill bagworms?
i already bought cynoff wp to spray my house for spiders, and was hopfull it would work on bag worms in cedar trees
ACynoff WP is not labeled for bagworm control. This is most likely because the product was mainly marketed for structural pests and was not tested for bagworm control. It is labeled for use on ornamental trees however so you could try it. We of course recommend using a product that is labeled for bagworms such as Talstar P. You can learn more about how to eliminate bagworms by reading our article Bagworm Control.
March 15, 2012
Larry from Clover, Sc 29710 asked:
QShould I but Cynoff WP or Cynoff EC best one for Carpenter Bees?
Which product is better for treating for Carpenter Bees or (which is stronger) -- Cynoff EC liquid or Cynoff WP powder. I prefer the liquid but will buy the strongest one.
ACynoff WP is usually chosen for carpenter because the powder residue sits on top of porous surfaces such as wood while the liquids can be absorbed and are not available to the bees when they land.
March 1, 2012
Brian from Wesley Chapel, Nc asked:
QWill Cynoff WP work for earwigs? EARWIGS! YUCK!
Over the past year and a half we've been having an issue with earwigs in the house. We find them in everyroom of the house and even on the stairs which is odd. Anyway, will this take care of my earwig problem?
ACynoff WP will definitely help with the earwig problem. Indoors, be sure to spray in the cracks and crevices around door frames, window frames, baseboards, places where cables, pipes or wires come through the wall and under appliances. Outdoors spray about 1 ft up the foundation and about 2 feet out on to the ground and also around door frames, window frames and places where cables, pipes or wires enter into the structure to create a barrier to stop insects from entering the home.
February 1, 2012
Mike from Texas asked:
QWhat is the shelf life of Cynoff WP?
I purchased 1 container of Cynoff (March 2011 ) and I wanted to know what the shelf live of Cynoff WP was ?
ACynoff WP should be used with in 3 years of the date of purchase. Be sure to keep the lid tightly closed and store the product in a cool dry place.
October 7, 2011
Bob from Las Vegas Nv asked:
QMy Las Vegas home has wooden floors with concrete footings over a crawl space with a soft sand floor.
My Las Vegas home has wooden floors with concrete footings over a crawl space with a soft sand floor. What areas inside the crawl space should be treated for scorpions? Should I use liquid and/or powdered insecticide?
AA wettable powder insecticide such as Cynoff WP will do a great job for scorpion control. You should treat all around the base of your home's foundation, and you can also treat around the perimeter of the crawlspace, if needed. Be sure to spray in the areas where scorpions actually harbor, rock beds, garden areas, brick walls, under landscaping timbers, and also spray around the perimeter of your home.
September 28, 2011 Dave asked:
QCan I use Cynoff WP dry with a duster?
I have a jar of Cynoff WP that I use mixed with water in my tank sprayer. I have an application where I need to get to carpenter ants inside a wall. I was thinking of using this product dry with a duster. Seems like it would work?
ACynoff WP can not be used dry as that is considered an off label use. Applying the Cynoff WP as a dust would likely mean you are over applying the dust to treated areas and could cause unsafe conditions. We do have many insecticide dusts available as well as the hand dusters needed to apply the dusts.
September 23, 2011
Judy from Huntsville, Alabama asked:
QWill tomato or other crop plants absorb this through their roots?
Fire ants like to build nests up against my tomato plants or fruit bushes. If I break up the nest and spray with this thoroughly, will the plants absorb this into their system/fruit?
ACynoff WP is not intended for use around edible vegetation and has not been tested to see if it can be translocated through the plants. You must keep applications of Cyper WP outside of the drip line of the root system of the tomato plants to insure safe applications. You can use fire ant bait in bait stations near the tomato plants to help with the current infestation.
September 16, 2011
Steven from North Augusta, Sc asked:
QShould I also spray Cynoff WP under the home?
The home is 100 years old, and the foundation is staggered brick with openings about 2" square.
AYou can spray Cynoff WP under the home to achieve a clean out of the pests that currently harbor in that area. To help prevent future infestations of the home, apply to a band of soil and vegetation 6 to 10 feet wide around and adjacent to the home. Also, treat the home's foundation to a height of 2 to 3 feet where pests are active and may find entrance. Apply as a coarse spray to thoroughly and uniformly wet the band area, using 1 gallon of spray mix per 400 square feet.
August 1, 2011 Efren asked:
QWhat should I use for an ant problem? Will Cynoff work for small roaches?
Cynoff seemed to work for the large roaches but the little ones are still around!
A It is normal to see the nymph roaches after spraying. Only the insects that actually come into contact with treated areas will be killed by Cynoff. Basically you have killed off the larger adult roaches with Cynoff WP but you still have egg cases that are hidden away and they will continue to hatch and you will see the smaller nymph or baby roaches. We recommend that you use an insect growth regulator such as Gentrol IGR to help halt the growth of the juvenile roaches. By halting the growth of the roaches you will be able to stop them from reaching sexual maturity which in turn will stop the prodution of new eggs. We also recommend that you use a roach bait gel such as Advion Roach Bait Gel to get rid of those roaches that hide in areas where cannot spray such as wall voids, cabinets, drawers and cupboards. You can purchase these two products together in our Roach Control Kit #1. Ants can also be controlled with a bait product. Advion Ant Bait Gel can be applied in areas where you see ant activity. The ants will eat the gel and return to the colony where they will feed the gel to the other ants, effectively wiping out the entire colony. It is very important to avoid spraying Cynoff in places where you apply the roach bait gel or the ant bait gel to avoid having the insects reject the bait.
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