Cynoff EC

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Average Rating

4.5 out of 5 stars Rating: 4.7

35 Reviews | 31 Q&A

Product Overview

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.

Features and Specs

Active Ingredient Cypermethrin 24.8%
Target pests Ants, Boxelder Bugs, Cockroaches, Centipedes, Crickets, Earwigs, Flies, Fleas, Millipedes, Mosquitoes, Silverfish, Spiders, Ticks, Wasps
* See Label for complete list
For use in Residential & Commercial Indoors & Outdoors: Apartments, Food Processing Plants, Greenhouses, Hospitals, Hotels, Nursing Homes, Restaurants, Schools, Warehouses, Perimeters of Buildings, Lawns & Ornamental Plants
* See label for complete list
Application 1/2 - 1 oz. per gallon of water
* See label for complete application instructions
Formulation Professional Product
CT & NY (Restricted To Licensed Applicators Only)
Shipping Weight 2.35 lbs
Manufacturer FMC (Mfg. Number: 11008424)
EPA Registration 279-3081


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.


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.


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.

5 stars   29
4 stars   3
3 stars   3
2 stars   0
1 star   0
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  • 4 of 5 Stars

    Great Product. Same as Pros use

    By Lorraine 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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    26 of 32 people found this review helpful

  • 5 of 5 Stars

    Box elder bug problems

    By Todd 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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    20 of 20 people found this review helpful

  • 5 of 5 Stars

    Cynoff EC = Dead Spiders

    By Paul 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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    14 of 17 people found this review helpful

  • 5 of 5 Stars

    Needed help with spiders and other crawling pests

    By Annie 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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    13 of 13 people found this review helpful

  • 4 of 5 Stars

    Great Product

    By Charles on 01/23/2011

    Verified Purchase

    My mom lives in a trailer home and she had roaches. We tried all the over the counter items and could not get rid of them. This product really did a great job of ridding the home of them. The product is expensive to continue to use as a normal treatment product.

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    13 of 16 people found this review helpful

See all 35 customer reviews

Questions & Answers

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Sort Questions
When spraying indoors Cyonff EC indoors, how long before it will be safe for indoor dogs to return?
Dogs can safely return to treated areas treated with Cynoff EC after the area is dry. Usually this will take about an hour.

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22 of 23 people found this answer helpful

Will 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?

Cynoff 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).

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16 of 18 people found this answer helpful

I need directions for mixing ratio for the liquid Cynoff EC concentrate.

Purchased the bottle last year and lost the mixing directions

The 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.

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16 of 21 people found this answer helpful

Will Cynoff EC kill ticks and fleas in the yard?

How much of an area does one bottle cover?

Yes 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.

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13 of 14 people found this answer helpful

Is Cynoff EC safe to use with a well on the property?

I just need to know that using this isn't going to hurt my well water. I also have horses and dogs on the property. What precautions should I use?

All people (except for the applicator) and animals need to be out of the area when Cynoff EC is being applied and they can return as soon as the area is dry. You should not treat closer than 15 ft to the well. Synthetic pyrethroids like Cynoff EC will not reconstitute once they are dry and are not known to move through the soil.

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9 of 11 people found this answer helpful

See all 31 customer questions

Cynoff EC 4.5 out of 5 stars Rating: 4.7 (35 Reviews / 31 Q&A)

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