Cynoff EC


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5 out of 5 stars Rating: 4.8

30 Reviews | 22 Q&A


{ $60.29 { $58.25 { $56.25 { $50.25
  Size/Description Price/Ea. Qty
Cynoff EC quart (32 oz)

Buy 1: $60.29 each

Buy 2 or more: $58.25 each

Buy 4 or more: $56.25 each

Buy 8 or more: $50.25 each

Total Price: $0.00

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Cynoff EC

Cynoff EC liquid concentrate with cypermethrin is a professional insecticide that controls many common insects for commercial and residential indoor and outdoor areas. For indoor use spray areas such as baseboards, corners, closets, doors, windows and others in homes to office buildings. All outdoor applications must be spot or crack-and-crevice treatments except for the following uses on soil or vegetation around structures; applications to lawns, turf, and other vegetation; or to building foundations, up to a maximum height of 3 feet. This may be used for many areas as in and around homes, office buildings, apartments, hospitals, hotels, restaurants, schools and trucks. Cynoff EC is a very versatile insecticide for professional accounts for homes and office buildings.

Cynoff EC with cypermethrin

For residual pest control in and on buildings and structures and their immediate surroundings and on modes of transport. Permitted areas of use include industrial buildings, houses, apartment buildings, laboratories, buses, greenhouses, and the nonfood/feed areas of stores, warehouses, vessels, railcars, trucks, trailers, aircraft (Do not use in aircraft cabins), schools, nursing homes, hospitals, restaurants, hotels, and food manufacturing, processing, and servicing establishments.

Cynoff EC Insecticide is to be diluted with water for spray or brush application. Fill sprayer with the desired volume of water and add Cynoff EC Insecticide. Close and shake before use in order to insure proper mixing. Mix only the amount of solution needed for the application; repeat treatments as necessary.

Ants, Biting Flies*†, Boxelder Bugs, Centipedes**, Cockroaches (maintenance), Crickets, Earwigs, Elm Leaf, Beetles†, Bees, Cockroaches (clean-out), Spiders, Ticks, Wasps, Firebrats, Fleas*, Flies*, Millipedes, Mosquitoes*†, Pillbugs, Silverfish, Sowbugs

* Outdoor use only   ** Not for Indoor use in California   † Not for use in California


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.

Food Handling Establishments: Places other than private residences in which food is held, processed, prepared or served. Nonfood Areas: Includes 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). Cynoff EC insecticide may be used as a general spot, crack and crevice treatment in nonfood areas. All areas where insects hide or through which insects may enter should be treated. Food Areas: Do not use in food/feed areas of food handling establishments, restaurants or other areas where food is commercially prepared or processed. Do not use in serving areas while food/feed is exposed or facility is in operation. Serving areas are areas where prepared foods are served such as dining rooms, but excluding areas where foods may be prepared or held. In the home, all food processing surfaces and utensils should be covered during treatment or thoroughly washed before use. Exposed food/feed should be covered or removed. Not for use in USDA meat and poultry plants.


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 by brush or as a residual spray either by hand or power sprayer. Apply 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, vegetation, refuse dumps, garages and in other areas where pests are found.

Barrier Treatment: To 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. Thoroughly and uniformly wet the band area, using 1 gallon of spray mix per 400 square feet.

Cluster Flies (Calliphoridae spp): Apply to the outside of the structure where flies are found. Mix 1 fl. oz. Cynoff EC to 10 fl. ozs. deodorized light weight mineral oil; apply to 1,000 square feet of wall area. Use a fogging apparatus which delivers the material in a strong air carrier, producing a small particle size (10-50 microns). Hold the nozzle about three feet from the surface to be treated. Apply when wind velocity is less than 2 mph to avoid drift. The surface to be treated should be dry at the time of application. Attics and unoccupied lofts should be treated at the same time and at the same rate.

CAUTION: Do not use water base sprays of Cynoff EC in conduits.

Rating Snapshot

5 stars   25
4 stars   3
3 stars   2
2 stars   0
1 star   0

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Average Customer Rating
5 out of 5 stars (30)

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Most Helpful Customer Reviews
  • 13 of 13 people found this review helpful:

    5 of 5 stars  Box elder bug problems
    By Todd in Mongomery, IL. on 04/12/2010
    Verified Purchase

    I had a Box Elder bug problem for the last 20 years. I have used several different products out on the market and have not found anything that would work. Since I have bought Cynoff EC and applied it to the surrounding foundation of my house the bugs have not returned.  I am very pleased with your product and would recommend Cynoff to anyone having the same issue I have had.

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  • 11 of 14 people found this review helpful:

    4 of 5 stars  Great Product. Same as Pros use
    By Lorraine in Lompoc, CA on 11/10/2010
    Verified Purchase

    We priced a professional and they wanted $150 for the first treatment followed by $60 every two months. In addition, they wanted everybody and all pets removed for 4hrs when they came for the treatment. I checked and this is the stuff they use. Easy to mix and use, not nearly as harmful as many products, and it seems to work great! Don't waste your money on the "Pros" just "Do My Own Pest Control!"

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  • 8 of 8 people found this review helpful:

    5 of 5 stars  Cynoff EC = Dead Spiders
    By Paul in Bixby, Oklahoma on 07/11/2011
    Verified Purchase

    I have been fighting brown recluse spiders for almost two years. Most of my fight has been done by a "professional exterminator". After doing a lot of research on the brown recluse spider and pest control in general, I discovered that my exterminator was not using the best pesticide for spiders, he was not using an appropriate amount of pesticide and he was not applying the pesticide in a way that would create an effective bug-barrier. Prior to me taking on the spiders myself, the only dead spiders I found were in some of the 30+ glue traps that I have stationed around the inside of my home and in my garage. Since I have been doing my own pest control, the spider-count in the traps is down substantially and I am actually finding dead or dying spiders outside of the traps. Cynoff EC is a real killer. I use Cynoff EC inside my home because it is non-staining; I use Demon WP around the perimeter of my home and in the garage because it is a wettable powder and it has a little more staying power. Cynoff EC and Demon WP have the same active ingredients, but the Cynoff EC drys clear and the Demon WP leaves a visible residue on my wood floors. Both work very well against spiders.

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  • 7 of 7 people found this review helpful:

    5 of 5 stars  Needed help with spiders and other crawling pests
    By Annie in Livingston, TX on 08/11/2010
    Verified Purchase

    So far, since spraying a week ago, we are seeing fewer spider webs. There are crawling insects laying on their backs with feet in the air. It looks like we have a good product here. We mixed it according to directions on the label. I was so pleased that it did not leave a white residue on the paint, screens and windows. This bottle looks like it will last a long time.

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  • 5 of 5 people found this review helpful:

    5 of 5 stars  Cynoff EC
    By Craig in Philomath, Oregon on 11/11/2010
    Verified Purchase

    We've had a ladybug problem for 5 years and used Cynoff EC to take care of it. The spray was easy to apply, it didn't stain our house, and it was very effective. We sprayed a little over a week ago, and we continue to see new dead bugs. We are very happy with this product and plan to reapply if needed.

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Most Recent Customer Reviews
  • 5 of 5 stars  Just as expected
    By B. in Madison, AL on 08/28/2017

    Everything came in quickly with zero hassle. Got exactly what I ordered.

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  • 5 of 5 stars  My purchase of Cynoff EC
    By Mary in Myrtle Beach, SC on 05/14/2017

    Your Web site was recommended to me by a professional exterminator, I do my own pest control and it was recommended to me to buy Cynoff EC because I have a problem with Palmetto bugs, I was getting at least 6 to 10 in the house daily, since I started using Cynoff EC I've seen 2 in the house in the last 2 weeks and those 2 were on their backs, so needless to say I'm very satisfied with this product and the service and shipping by your company . Thank you

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  • 5 of 5 stars  Best insect protection ever
    By Mark in Ladysmith Wi on 09/25/2016

    Best pest control I have ever used. I use it mainly to protect our house against Asian Beatles, I have found the elimination of other intrusive insects is an added benifit of Cynoff

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  • 5 of 5 stars  Sign off on insect problems
    By Ski in Venice, Florida on 08/16/2016

    I live in South Florida. Part of the building process is to poison the entire footprint of the construction slab before pouring. This is an indication of how prominent the insect problem is. In this case, termites. I found this product online a decade ago. I use nothing else. I spray the exterior walls about two feet above the ground in a continuous line. I sometimes spray the interior along the baseboard line throughout. But after about 2 or 3 years of interior spraying I don't even do that anymore. The bugs are gone. Now I spray the exterior once a year and see an occasional ant. There is nothing like it. It lasts for months and months. It makes gallons. We have cats too. Once it dries..never a problem. If you have a bug problem, buy this stuff. Ski, Florida.

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  • 5 of 5 stars  This is the real deal!
    By Aimee in El Paso, TX on 08/13/2016

    We live in the desert where we get scorpions, camel spiders etc, and with this, we don't see any of them. When I lived at my parents house we used this for 10 years and never saw a single roach or spider in those 10 years. Then my husband and I bought our first home in the newer development and started seeing scorpions and camel spiders. We spray once every two or three months and it keeps everything away, including smaller problems like fire ants in the backyard. Love love love and will never live without this stuff. We are your walking advertisement!

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  • 5 of 5 stars  Effective pesticide
    By Rob in Littlefield, AZ. on 06/26/2016

    Sprayed around my home foundation about a week ago. Numerous dead insects found. Cockroaches, spiders, beetles, ants. Seems to be an excellent control barrier.

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  • 5 of 5 stars  spider webs and tracks
    By Alvin in Edinburg, VA on 05/12/2016

    a neighbor told me about this stuff and it works very well, I just had my siding power washed to remove all of the spider tracks and other unwanted grime. I had planned to try this out to control all of the spider tracks. within 2 days time I started seeing spider webs and tracks immediately and then my Cynoff EC arrived and I followed the instructions and applied it to all of my cracks and crevices on my siding and immediately I saw results of no more spider webs and tracks very good product and quick delivery from DoMyOwnPestControl with free shipping

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Cynoff EC
    By Dale in Duncan, OK on 04/18/2016

    Cynoff EC has great residual, virtually odorless and cost effective

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  • 5 of 5 stars  Great Product
    By Red in Henderson, Nevada on 10/01/2014
    Verified Purchase

    This is a great product for all pests. Works to remove the unwanted critters

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  • 5 of 5 stars  Cynoff EC will kill bagworms
    By John in Madison AL on 07/11/2014
    Verified Purchase

    I have been using this around the house for a couple years and it works well. I found that my evergreen shrubs were covered with bagworms. This product is not listed for bagworms but it is in the same class of chemicals so I tried it. Mixed at 1 oz per gallon in a hose end sprayer. 30 minutes later they where hanging out of the bags and dying.

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Most Helpful Q&A's

09/23/2010 Mitch

QWill Cynoff EC leave a noticeable film on my dark siding?
I notice that several of the cypermethrin based products say they leave a powdery film on dark surfaces. I want to spray my dark gray siding where I have a massive stink bug infestation. Does this product leave a similar film?

ACynoff EC will not leave a white powdery residue on dark siding. The products that leave that white powdery residues are in fact wettable powders and all have the letters WP in the product name (Cynoff WP, Demon WP).

7 of 8 people found this answer helpful.
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05/01/2012 Greg from Ms

QWhen spraying indoors Cyonff EC indoors, how long before it will be safe for indoor dogs to return?

ADogs can safely return to treated areas treated with Cynoff EC after the area is dry. Usually this will take about an hour.

5 of 6 people found this answer helpful.
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06/16/2014 Darlene from United States

QI need directions for mixing ratio for the liquid Cynoff EC concentrate.
Purchased the bottle last year and lost the mixing directions

AThe Cynoff EC is mixed at different ratios depending on the pest you are treating. Typically, you would mix 0.5 - 1 oz per gallon of water. Please be sure to read the Cynoff EC product label before using.

4 of 6 people found this answer helpful.
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05/11/2013 Jerry from San Angelo, Tx

QWill Cynoff EC kill ticks and fleas in the yard?
How much of an area does one bottle cover?

AYes Cynoff EC will kill Fleas and ticks in the yard. You want to mix 1oz Cynoff EC with 1 gallon of water. For best results, we recommend also mixing in an Insect Growth Regulator like Nyguard that will treat the eggs, larvae or nymphs - and prevent them from maturing into reproductive adults thereby controlling future infestations. NyGuard IGR will cause morphological anomalies or changes and disrupt the expected insects' state of development, leading to sterility or death. Please let us know if you have any other questions.

4 of 4 people found this answer helpful.
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06/18/2010 Jerry

QHow long is the residual effect Cynoff EC expected to last?
Cynoff EC is a residual pest control product. When used indoors I would expect it to be effective longer than when used outdoors. I read that it should be applied every two weeks for proper control of fleas, but that seems like a very short residual effect. So, how frequently should I treat with Cynoff EC for control of ants, roaches and flies?

ACynoff EC can be expected to last up to 30 days outdoors and up to 60 days indoors.  UV light and rain outside can deplete the residual outside, but UV light is the main culpret.  If one side of your home is in direct sunlight all day, then you may only get 3 weeks out of the product.  For fleas specifically it is a good idea to treat once and then again exactly two weeks later because fleas hatch every two weeks and your chances are better if the product is stronger than weaker.  After the first two treatments you should be able to only apply every 30 to 60 days for maintenance control. 

3 of 3 people found this answer helpful.
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Most Recent Customer Questions

09/16/2017 Jacobwolinsky from Passaic, Nj

QIs Cynoff EC safe to use indoors?


Yes,†Cynoff EC†is safe for indoor use as long as it is used according to the instructions on the label.† All people (except for the applicator) and animals should be†out of the area when the product†is being applied.† They can return as soon as the area is dry.†

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09/12/2017 Monica from Safford

QIs a water softener going to affect Cynoff EC when I mix it?
I have a water softener, and the water is salty.


No, this should not affect†Cynoff EC†when used. Be sure to do a small tank mixture to ensure there is no clumping of the product in the water.

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04/21/2017 Janet from Navarre, Fl

QDoes Cynoff EC work on mole crickets?


No, Cynoff EC is not labeled for mole crickets.

We would recommend using Bifen XTS for mole crickets. The label recommends that you use the lower rate of 0.07 oz. per gallon of water in early Spring to control overwintered mole crickets.† For summer applications, it is recommend to use the higher rate of 0.15 fl oz. per gallon of water.

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04/20/2017 Glenn

QWill Cynoff EC be toxic to iguanas?


Cynoff EC†should not harm iguanas when used as directed. †That being said they should be out of the area during treatment dry.†

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04/11/2016 David from Holden, Wv

QUsing the standard mixing, how much solution can 1 quart of Cynoff EC make?


With Cynoff EC you make anywhere between 32-64 gallons of solution using the standard mixing of 0.5-1 fluid ounce per gallon of water.

1 of 1 people found this answer helpful.
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02/09/2016 Alberto from Hemet

QWill Cynoff EC insecticide get rid of spider mites?


Unfortinately,†Cynoff ECis not labeled for spider mites.I would recommend†Forbid 4F Ornamental Insecticide Miticide.†This will cover all types of spider mites as well including twospotted, southern red, boxwood, spruce, and euonymous.†

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06/23/2014 Bryan from Indpls., In.

QIs this oil based like Demon Max? I don't want any staining. Need a complete general use product for rentals.

AYes, the Cynoff EC is oil based, may stain, and has a foul odor. However, Bifen IT would be a great water based insecticide that will not stain any surface that is tolerable to water, has low odor, and is a broad spectrum insecticide that may be used indoors and outdoors for most of your pest control needs.

1 of 2 people found this answer helpful.
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06/06/2014 Brant from Bettendorf, Ia

QWhat products are recommended for the control/elimination of Odorous House Ants?
Odorous house ants are present in our home, around the exterior foundation, and throughout our landscaping. In certain locations, they seem to come from the walls. They only present themselves in the warm weather months and disappear during the cold winter months. I have used Cynoff EC in both interior and exterior applications with marginal results. I have used baits from the local hardware store, with Terro Liquid Ant Killer being the only product that they are attracted to. But the Terro seems to only provide limited control without eliminating them. I'm wondering if a dust application or some higher strength bait would provide better results. They are quite picky when it comes to baits, so selecting an effective one has been challenging. Please recommend some products that will help control/eliminate these little boogers!

AFor an outside treatment for Odorous house ants, Cynoff EC is good to use for outdoor use. Indoors, baits are good to use. A protein bait, Maxforce Complete Granular Bait and a sugar bait, Maxforce FC Ant Bait Gel are the baits that can be used inside. Ants will eat one or the other or both depending on what they are looking for at that moment. A dust that can be used inside the wall voids is Delta Dust Insecticide. That can be placed inside the walls with a hand duster by taking off the electrical sockets and light plates.

1 of 1 people found this answer helpful.
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09/07/2013 Jason from Cherry Valley, Ca. 92223

QWe are in Cherry Valley, Ca. 92223. We have black widows, ants, and mice. What do you recommend for each?
We live on 5 acres, have chickens, dogs, and cats. We have used your Cynoff EC and are not sure if that is the best application and whether or not it is safe for the chickens.

ACynoff Ec is a great product to treat Mice and Black Widow spiders. Please contact FMC to make sure exactly where you can apply this product, as California does have restictions. 800-321-1362. We recommend using Mouse bait stations like protecta RTU stations and then putting mouse bait in the stations like Contract Blox. Please see our Mouse Control Page.

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04/23/2013 Sergio from Laredo, Tx

QCan you use Cynoff EC with a ULV fogger?

AYes, you can apply Cynoff ec with a fogger. Per label : Use a fogging apparatus which delivers the material in a strong air carrier, producing a small particle size (10-50 microns). Hold the nozzle about three feet from the surface to be treated. Apply when wind velocity is less than 2mph drift. Fogging works great on mosquito treatments.

1 of 1 people found this answer helpful.
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See all 22 questions »

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