Conquer Liquid Insecticide

$26.60 - $281.28

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4.5 out of 5 stars Rating: 4.5

73 Reviews | 52 Q&A


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Conquer Liquid Insecticide pint (16 oz)

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Conquer Liquid Insecticide

Conquer Residual Liquid Insecticide Concentrate controls numerous pests in and around structures. Application within residential and commercial buildings including homes, apartment buildings, kennels, and non-food areas of industrial, institutional, and commercial buildings, such as hospitals, hotels, warehouses, truck trailers, railroad cars, theatres, office buildings, and schools.

Conquer is a great multi-pest insecticide offering a lasting residual. This product may be used indoors and outdoors to eliminate insect intruders. Conquer is labeled for most stored product pests, Ants, Cockroaches, Crickets, Earwigs, Fleas, Flies, Gnats, Millipedes, Mosquitoes, Moths, Psocids, Scorpions, Silverfish, Sowbugs, Spiders, Ticks and Waterbugs.

Conquer is a very effective product to control fleas (and ticks) indoors and outdoors.

To control fleas indoors:

Mix 1 oz of Conquer with 1 gallon of water in a hand sprayer. Apply on carpeted areas and underneath furniture where fleas may harbor taking care not to get solution on hardwood floors or wooden furniture. (you may also add 1 oz Precor IGR Concentrate to 1 gallon of the finished Conquer/water solution for more effective flea control).

Please read our informative article on How to Get Rid Fleas Indoors for complete instructions on how to do an indoor flea treatment.

To control fleas outdoors:

For a 50 x 40 yard mix 2/3 fl. oz. of Conquer with 12 gallons of water. To obtain best results, lawn should be mowed a day or two before spraying. Using a hand sprayer apply in a slow, even sweeping motion, being sure to cover the entire lawn surface where the pests will normally frequent. Spray under ornamentals and trees, but avoid soaking young or flowering plants. If needed, repeat application treatment in 7-14 day intervals.

Please read our informative article on How to Get Rid Fleas Outdoors for complete instructions on how to do an outdoor flea treatment.

To Kill Ants, Centipedes, Cockroaches, Crickets, Earwigs, Millipedes, Psocids, Scorpions, Silverfish, Sowbugs, Spiders, and Waterbugs:

Apply diluted spray with a sprayer that produces coarse, wetting droplets into all cracks and crevices in woodwork and floors, underneath sinks, areas behind pipes, and in all non-food contact places where these insects shelter. Use a dosage of one (1) gallon of spray dilution per 1,000 square feet (40mls/L). Contact as many insects as possible with direct spray. Repeat application as needed, but do not exceed more than one (1) application every seven (7) days in restaurants and similar food service establishments or more than one application every fourteen (14) days in all types of food handling establishments.


All outdoor applications, must be limited to spot or crack-and crevice treatments only, except for the following permitted uses.

  1. Applications to soil or vegetation.
  2. Applications to lawns, turf, and other vegetation.
  3. Applications to the side of a building, up to a maximum height of 3 feet above grade.
  4. Applications to underside of eaves, soffits, doors, or window permanently protected from rainfall by a covering, overhang, awning, or other structure.
  5. Applications around potential pest entry points into buildings, when limited to a surface band not to exceed one inch in width.
  6. Applications made through the use of coarse, low pressure spray to only those portions of surfaces that are directly above bare soil, lawn, turf, mulch or other vegetation.

Rating Snapshot

5 stars   58
4 stars   6
3 stars   1
2 stars   4
1 star   4

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Average Customer Rating
4.5 out of 5 stars (73)

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Most Helpful Customer Reviews
  • 24 of 28 people found this review helpful:

    5 of 5 stars  By far the best
    By Thomas on 04/17/2008

    It works. Conquer insecticide is the best stuff I have ever bought. I have tried all the rest this is far the best.

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  • 22 of 25 people found this review helpful:

    5 of 5 stars  The Best
    By Gayle in Oxford, Al. on 04/12/2010
    Verified Purchase

    We have 3 cats and 1 dog. Last year the fleas nearly made us all go crazy! I finally found Conquer and Archer on this web page (best prices) and finally..... FINALLY we got our lives back!!! It worked, was easy to put down, just make sure you follow instructions. About a week more fleas! It's once again time to put down in the yard. Thanks for a wonderful product that works!

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  • 18 of 18 people found this review helpful:

    5 of 5 stars  Amazing!
    By Jennifer in Chesapeake, VA on 07/08/2010
    Verified Purchase

    I used a Conquer and Archer mixture for my flea problem inside and in the yard and it knocked it out 1-2-3. I had used other foggers, sprays, powders and granules with no luck. Conquer and Archer did the trick.

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  • 15 of 16 people found this review helpful:

    5 of 5 stars  This stuff is great!
    By Jessie in Memphis, TN on 08/24/2010
    Verified Purchase

    Following the specs for an infestation, I had dead roaches all over the place. I had to clean the floors for three days in a row, it's better than anything I've ever used, and I've used a lot of brands. Try it (Conquer), I believe you will be satisfied.

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  • 12 of 12 people found this review helpful:

    5 of 5 stars  Problem Solved
    By Charles in 29 Palms ,Ca. on 10/15/2010
    Verified Purchase

    My reason for buying this product was utter desperation. We have a small dog run for an even smalller dog,Over the last 2 years we hired 3 nationally know exterminator companies for the sole purpose of erradicating an infestation of ticks from that run. All failed . One application of the Conquer Insecticide ,following the clear and simple directions, has eliminated what seemed to be an un-solvable problem.

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Most Recent Customer Reviews
    By Vyrene in Austin on 03/29/2017

    I have been using this for sometimes, because it is the best for those ants, that show up in your yard after it rains. This is a great product to quickly get rid of them.

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  • 5 of 5 stars  Cut Ant Cure
    By Kent in New Braunfels on 03/20/2017

    We have had a big problem of ants taking leaves off of our bushes. None of the big box stores had a product that worked. We ordered the Conquer Liquid and applied it to the tunnel entry as directed. Very satisfied with the results.

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  • 5 of 5 stars  Worked great on town ants (leafcutter)
    By Smart in Louisiana on 11/10/2016

    Had 2 areas of town ants. Mixed it up & poured in holes. No sign of ants next day. Find the main holes that will let you fill up their chambers.

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  • 3 of 5 stars  Does it last?
    By Rick in 46816 on 10/21/2016

    stickbugs on back of house & sprayed house but still see them?

    Expert Response   Expert response:
    Thank you for your comments. If you are referring to stink bugs, then they are an overwintering pest that we will see gather on the warm sides of homes and other buildings as temperatures cool in the fall. We recommend treating for stink bugs and similar pests like Asian lady beetles, boxelder bugs, and cluster flies once a month from August until November, or until you've had a hard freeze. There is some residual activity from Conquer, usually up to about 30 days outdoors, but you can retreat as soon as 7 days after the initial treatment if needed. Please let us know if we can further assist you!

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  The Real Thing...
    By M in Moravian Falls NC on 10/11/2016

    Conquer is the real deal for fleas and it has almost no odor at all. one ounce of Conquer and one ounce of IGR/Nylar in a gallon of water.3-4 hours after treatment all fleas were dead and have not returned(14 indoor cats and 2 indoor dogs). total investment less than half of one "Pro Exterminator" visit and there is enough for several treatments left. i can't say enough about how good Conquer is,think 1970's era heavy duty insecticides without the OMG! am i gonna die from the vapors/smell. from now on DoMyOwnPestControl is my go to place for insecticides that work.

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  • 4 of 5 stars  Conquer
    By Walter in Scurry, Tx on 08/17/2016

    Bought this originally along with an IGR to combat a flea infestation in my dog pen, which it worked very well. I found it also eradicated scorpion and spider problems we were experiencing in our house by using it in 6 month intervals.

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  • 5 of 5 stars  another great product
    By Merrell in White Sulphur Springs wv on 08/17/2016

    MY first time to use Conquer and i am very happy with the results, easy to mix and use, went by the detailed instructions and it worked. this product did not leave a visible film on my wood trim and i recommend it to my family and friends, This product would be great for any pest control company, I give this one 5 stars.

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  • 2 of 5 stars  Fleas
    By Rick in West frankfort on 08/12/2016

    Been in pest control service for 38 years. Used it all. Conquer has produced call backs for me on flea treatments. Not as good as advertised.

    Expert Response   Expert response:
    We apologize you did not receive the expected result from using the product. Please note that flea treatments require thorough vacuuming prior to treatment and every day for the next 14 days after the application. Reapplications must be done every 14 days for 2-3 applications depending on heavy the flea infestation was prior to treating. Reapplications are necessary due to the life cycle of the flea and how they are protected from the treatment in the larval and egg stages. Vacuuming helps them to hatch or become active which is why it is recommended that you vacuum and then apply the spray.

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  • 1 of 5 stars  Flies
    By Joe in Simi Valley, Ca on 07/31/2016

    It did not work. I have more flies now, since I've been using Conquer Liquid Insecticide....

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Stopped the nightmare...
    By Adam in Elgin, Oklahoma on 06/08/2016

    Used this product along with Archer IGR to knock down a severe infestation caused by the farmer spraying his cattle field and pushing the pests into my property coupled with the perfect breeding conditions this year for fleas. It started when we noticed one and then within a couple days it turned into thousands... So here we are two weeks later and zero fleas. I'm keeping this on hand to prevent any further issues we may encounter in the future however, I don't foresee any. Buy with confidence. DYOP were a godsend.

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Most Helpful Q&A's

03/28/2011 Hn

QIs Conquer safe to spray inside of a dog kennel if the dogs are present?
I would like to use this in a dog kennel with dirt floors, is it safe for the dogs to be in the area when the building is being sprayed?

ADogs must be removed from the area that is being sprayed. The dogs can return as soon as the area is dry (usually less than 1 hour).

11 of 11 people found this answer helpful.
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04/17/2011 William

QDoes Conquer kill bed bugs?

AConquer is not labeled for bedbugs and is not intended for use on bed bugs. There are many other products on the market that have been tested and labeled for bed bugs. Phantom is one of our most popular bed bug products as it is non-repellent and there is no known resistance to this product. You can check out the rest of our bed bug products by clicking on the Bed Bugs tab at the top of any page on our website.

10 of 10 people found this answer helpful.
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11/23/2009 Bruce

QWhat is the mixing ratio I need to conquer these fleas with Conquer?
Got rid of dog. Back yard is now infested with fleas. 40 to 50 fleas cover my jeans when I step out back. Terrible. I will no doubt buy the IGR as well. Can I mix them together? Thanks.

AMix 1 oz of Conquer with 1 gallon of water in a hand pump sprayer and apply at a rate of one gallon per 1000 square feet. (you may also add Archer IGR to 1 gallon of the finished Conquer/water solution for more effective flea control.  Archer IGR is made for outdoors and holds up better in the sunlight. Read the product label for complete instructions and safety precautions before using the product.

7 of 7 people found this answer helpful.
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12/05/2011 Alexander from Puerto Rico

QHow effective is Conquer on ticks? Would Archer IGR be a good addition?
I have a tick infestation that I've been battling for months. I have two siberian huskies that I usually bring inside during the day and to sleep at night, sometimes in the bed. I've tried another department store product, Bayer Advance Complete Insect killer, and it's proven ineffective.

AConquer is labeled for ticks and should do a great job for you. The addition of Archer IGR will be necessary to help you get control of the tick population on your property. Do not make spot applications outdoors. Treat the entire area where exposure to ticks may occur. Use more water (not more product) when treating areas with dense ground cover or heavy leaf litter. Ticks may be reintroduced from surrounding areas on host animals. Indoors, thoroughly apply as a spot treatment to infested areas such as pet beds and resting quarters; nearby cracks and crevices; along and behind baseboards, window and door frames; and localized areas of floor and floor coverings where these pests may be present. Repeat treatments will be necessary to achieve and/or maintain control during periods of high pest pressure. All of your dogs should be treated with a product that is specifically labeled for use on dogs for tick control.

You can also help by creating a "tick safe zone" in your yard. You should have an area that is at least 9 ft wide between your yard and any wooded area. Trim back trees to allow as much sunlight as possible into your yard. Keep grass as short as possible. Remove as much leaf litter as possible. A clearly defined, well manicured border between your yard and any wooded areas or weedy lots will reduce the chance of ticks infesting your yard.

7 of 7 people found this answer helpful.
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09/22/2011 Tara from Clayton Nc

QCan I add Martin's IGR to Conquer? What will the indoor/outdoor mix ratio be in the one gallon sprayer?
I need to kill the fleas indoors and outdoors. Can I buy the 1 oz. bottle and mix that in with the Conquer? I have a 1500 sq. foot home and a 1/4 acre yard.

AYou can add Martins IGR to Conquer for flea control. You can mix 1 ounce of each product into one gallon of water to treat 1,000 sq ft area. When treating outdoors you can increase the volume of water to insure even coverage in areas with dense vegetation (i.e., use 2-5 gallons of water with the 1 oz of each product).

6 of 6 people found this answer helpful.
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Most Recent Customer Questions

09/30/2016 Mike from Aberdeen, Nj

QCan you clean vinyl siding a few weeks after it's been treated with Conquer Insecticide?
I've recently applied Conquer to the exterior of my home and about 3ft up the siding. If I used a power washer to clean the siding will this render the chemical on the siding useless?


Yes, you can clean the siding after applying Conquer Insecticide with soap and water. The residual will stay in the area for at least 30 days. A pressurized sprayer would likely remove the residual product from the area

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09/16/2016 Jenna from Stony Brook, Ny

QHow soon does Conquer kill crickets?
Sprayed perimeter of house with Conquer this afternoon. 7 hours later, a massive number of crickets are in my house-- worse than ever. Is this normal? Am I supposed to wait for the stuff to work, or should it have worked already?


Conquer does not offer a fast kill. Insects should die within 24-48 hours after contacting treated areas. The active ingredient in Conquer is known to be very irritating to insects and it can cause them to be more active before they are eliminated.

1 of 1 people found this answer helpful.
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08/30/2016 Janice

QHow long does it take to see the improvement of using Conquer Liquid for roaches, and how often should I use?


Conquer†will start working immediately on the roaches that come into contact with the treated surfaces. It is not a contact kill so they will not die as soon as they touch it, but it will start to work on their system and will start getting weaker and dying within a few hours of contact. We recommend that in addition to a concentrated liquid insecticide like Conquer you also use a high quality roach bait gel such as†Invict Roach Bait Gel†to help get the roaches that hide in places where you cannot spray (cabinets, counter tops, drawers) as well as an insect growth regulator such as†Gentrol Point Source†to help stop the breeding cycle of the roaches. Take a look at our article on†How To Get Rid of Roaches†to get an explanation of the complete treatment needed to eliminate them.

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08/11/2016 Carey

QHow much Conquer Insecticide do you put in a 50 gallon sprayer for an outdoor flea treatment?


The mixing ratio for Conquer Insecticide in 50 gallons of water is 50-100 fl. oz. The mixing ratio per gallon of water is 1-2 fl. oz. It is recommended that you mix a growth regulator, such as Archer IGR, with the insecticide.†Be sure to do treatments every 30 days outdoors for control.†

1 of 1 people found this answer helpful.
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07/26/2016 David from Snyder, Texas

QWhat is the mixing ratio for using both Conquer Liquid Insecticide and Archer IGR together for fleas and roaches?


You would use 1 oz of Conquer Liquid Insecticide per gallon of water along with 1 oz of Archer IGR as well over 1000 sq. feet. Archer IGR is made for outdoor flea control and holds up well in the sunlight. Please read the product labels for each full instructions before use.

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07/25/2016 Collins

QHow does Conquer Liquid Insecticide work on fleas after it has dried on surfaces?


Conquer Liquid Insecticide†leaves a residual after it has dried to keep killing insects including fleas. Be sure reapply every 2 weeks.

1 of 1 people found this answer helpful.
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05/14/2016 Alicia from Chattanooga, Tn

QDoes Conquer Liquid Insecticide have a shelf life?
I purchased some in July 2013.It worked great with Martins IGR. No fleas until I found some on my INDOOR ONLY cats today. We want to retreat the house and are hoping this is still effective to use. I found a 3 year time on the IGR but can't find anything on the Conquer product.


Conquer has a three year shelf life from the date of purchase if kept away from extreme temperatures.†Please take a few moments to read over our article How to Get Rid of Fleas to learn how to implement a successful Flea control program.

2 of 2 people found this answer helpful.
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03/15/2016 M.d. from Quemado, Tx

QWhat is the mixture ratio of Conquer Liquid Insecticide for fire ants?


The mixing ratio for Conquer Insecticide is 1 fl. oz. per gallon of water. According to the label, this product can be used for the contact kill of fire ants, however,† it is recommended that you use a product that is specifically labeled for fire ants in conjunction as well.

We would recommend checking out our Fire Ant Guide for tips on how to treat and prevent fire ants.

1 of 1 people found this answer helpful.
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03/08/2016 Justin from Upton

QHow do I mix Conquer and Nyguard together to spray inside my house, how much of each and how much water to treat fleas?


You would mix 1-2 oz of Conquer and 3-8 ml of Nyguard IGR per gallon of water to cover 1000 sq ft inside for fleas. †You would use the higher rates for heavy infestations and initial applications, and use the lower for follow-up and maintanence as needed.

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10/29/2015 Mark from Fl

QDoes Conquer kill German cockroaches?


Conquer will kill the roaches and other insects that contact a treated surface but should not be the only product used to effectively eliminate an infestation. We would recommend one of our roach control kits. You can see the kits by clicking on the link here. We also have a great article for eliminating German Roaches here.

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