Precor IGR Concentrate

$6.70 - $52.32

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4.4 Rating: 4.4

28 Reviews | 29 Q&A 


  Size/Description Price/Ea. Qty  
Precor IGR Concentrate bottle (1 oz.) $6.70
Precor IGR Concentrate - Box (10 x 1 oz. bottles) box (10 x 1 oz. bottles) $50.50
Precor IGR Concentrate - 16 oz. bottle 1 pint (16 oz.) $52.32
Total Price: $0.00

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For large order quotes, please call us at 1-866-581-7378.

Precor IGR Concentrate - Box (10 x 1 oz. bottles)

Only Precor IGR's molecules move to the places pre-adult fleas live, like the base of carpet fibers and between furniture cushions - in short, the sources of a flea infestation. Precor IGR targets fleas in the egg and larval stages of development. As a result, pre-adult fleas cannot produce new infestations of breeding, biting adults. PREVENTS ADULT FLEA EMERGENCE FOR 7 MONTHS.

For control of active flea infestations, this product works best when combined with an adulticide such as Suspend SC or Demize E.C. which will help to provide quick knockdown of adult fleas.

See our entire selection of professional IGRs.

Active Ingredient: Methoprene
Target pests: Fleas. Does not work on ticks. For Ticks, see Precor 2000 plus.
For use in: indoor control only of pre-adult fleas - up to seven full months. Does not work outside in direct sun.
Application: Apply at a rate of 1 oz per 1 gallon of the diluted spray solution per 1500 sq ft of surface area with any low pressure sprayer with a fan tip that is typically used for indoor applications.
Pet safe: yes, when dry.
Yield: Prevents adult flea emergence (by preventing flea eggs and larvae from maturing) for up to 7 months as long as carpet is not shampooed or steam cleaned. This means if a flea egg drops off of infected dog, flea egg will not develop. 3 year shelf life.
Manufactured By: Zoecon

Precor® IGR acts on the immature stages of a flea’s life cycle. Flea eggs deposited on or flea larvae crawling onto treated surfaces will not develop into adult fleas. Existing adult fleas and flea pupae are not affected and thus, Precor® IGR Concentrate is generally used in conjunction with an approved insecticide labeled for adult fleas. Effective, long-lasting indoor control of pre-adult fleas - up to seven full months. Mix with water to make 1 gallon of finished product. 1 oz.

To prevent infestations before they start, apply PRECOR prior to flea season.

When applied to surfaces where fleas are found, such as carpets, upholstered furniture, and pet sleeping areas, PRECOR prevents adult flea emergence for up to 7 months. Controlling fleas on pets is important to prevent introduction of adult fleas indoors. If fleas are a problem on pets, treat the pets with an effective EPA registered flea control product.

Prepare a diluted spray solution with a final (S)- Methoprene concentration of approximately 0.007%, by adding 1 oz of PRECOR to 1 gallon of water. Partially fill the mixing container with 1/2 gallon of water, add PRECOR, shake well, and then add the remaining 1/2 gallon of water. Shake well before each use. When tank-mixing, follow the directions above except add the product to tank mix first, agitate, and then add PRECOR, agitate and complete filling of spray tank, and agitate once more. Apply at a rate of 1 gallon of the diluted spray solution per 1500 sq ft of surface area with any low pressure sprayer with a fan tip that is typically used for indoor applications. Treat all areas harboring fleas, including carpets, furniture, pet sleeping and bedding areas, and throw rugs. Treat under cushions of upholstered furniture. Avoid contact with treated surfaces until dry.

When applying to upholstery where staining could be a concern, apply dilution to a small inconspicuous location to determine if possible staining could occur. Generally, PRECOR will not stain areas that would not be stained by water alone.

Rating Snapshot

5 stars   21
4 stars   1
3 stars   3
2 stars   1
1 star   2

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Average Customer Rating
4.4 star rating (28 reviews)

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Most Helpful Customer Reviews
  • 31 of 33 people found this review helpful:

    5 of 5 Stars  Precor works
    By Jesse in MO on January 3, 2009

    Precor IGR Concentrate is fantastic for keeping the fleas away. We would recommend it to anyone.

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  • 24 of 25 people found this review helpful:

    5 of 5 Stars  Precor cure!
    By Zac in Western PA on August 15, 2010

    I bought this stuff as backup. I used a bunch of the Precor foggers along with some Ultracide to get rid of the flea issues I was having. They took care of the problem. I bought this stuff just in case I needed it. Precor does the job, folks! Fleas have been bad in my state this year. EVERYONE has had fleas. EVERYONE! I gave 2 bottles away for people to try. They used this as the IGR (like box states) and then used cheap store brand foggers to kill the adults. They also agree, this stuff works good for the non-adult stages.

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  • 18 of 18 people found this review helpful:

    5 of 5 Stars  Precor IGR Concentrate
    By JC in Onalaska, Texas on July 24, 2011

    Had used Precor IGR Concentrate some years ago but it became unavailable at any of the outlets in this area. Precor is probably the absolute most effective product for the control of fleas. The area here is having a sand flea epidemic/infestation due to migration of sand fleas because of the severe drought conditions. It took three applications of Demize EC and Precor IGR to finally render the house flea free. The first application was a mixture of four ounces of Demize and two ounces of Precor in two gallons of water. The second and third application were done with two ounces of Demize and one ounce of Precor in one gallon of water. This was done on three successive Friday mornings. The fleas gradually disappeared, and haven't seen any fleas since.

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  • 16 of 16 people found this review helpful:

    5 of 5 Stars  Flea Control
    By Dagmar in Blountville, TN on August 1, 2011

    I ordered this after I found an empty bottle left by a pest control company that I had been paying every month, but cancelled because I was not happy with their service. I looked Precor IGR up on the internet and was very pleased to know that I could order it myself and do the pest control. I already knew it worked and was happy that I could save money by doing it myself. I liked the free shipping and the customer service rep. was very helpful. I am glad I asked about the existing adult fleas as this product does not deal with that issue. She directed to another product to mix with Precor IGR and I am happy to say, both products work wonderfully. After my initial investment, I will be saving money and be free of fleas and ticks.

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  • 13 of 14 people found this review helpful:

    5 of 5 Stars  Precor combined with Suspend SC
    By T in Spencer, WV on November 6, 2011

    I used this product in combination with Suspend SC for a flea problem that many other products failed to eradicate. One application and no fleas or signs of fleas for over two weeks. One word of caution, there was a stout chemical odor for about an hour, but we just closed up the house and left for the afternoon and aired out upon return. Product worked fine for our family and we were all impressed that it actually performed as advertised.

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Most Recent Customer Reviews
  • 5 of 5 Stars  precor
    By David in wichita falls, texas on March 1, 2015
    Verified Purchase

    use this with tempo it works good and it's cheaper to buy at do my own pest.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Added Precor to Conquer Mix
    By Dan in San Jose, CA on December 23, 2014
    Verified Purchase

    I added an ounce of Precor IGR to the sprayer when I mixed the Conquer (2 0z.). The Conquer killed all the fleas immediately and I'm hoping the Precor does it's job and stops any eggs from maturing. So far, so good. No sign of fleas on the 3 cats or anywhere in the house for about a month now.

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  • 3 of 5 Stars  Seeing fewer fleas but not completely gone?
    By Chris in Irondale, Mo. on October 20, 2014
    Verified Purchase

    I've been doing lots of reading, researching, and applying the same chemicals that exterminators use with some success. I use a combination of an adultcide Permethrin and an IGR Precor. It's been over 3 weeks now and I still have fleas. Although I'm also using Frontline Plus on my dog who is permanently outside now and he still has fleas as well? I'm hoping that by vacuuming, and retreating I will eventually get this problem under control for good.

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  • 2 of 2 people found this review helpful:

    5 of 5 Stars  the missing ingredient
    By Timothy in Rochester, NY on September 23, 2014
    Verified Purchase

    My wife suffers with asthma and reactive airway disease. When our home became infested with fleas after I petted the neighbor's outdoor cat we were in a pickle because we could not use adulticides. We were attempting to kill them off with all natural methods including salt, diatamatious earth and excessive vacuuming. These methods knocked down the population but did not prevent reinfestation. This product was the missing piece of the puzzle. We were able to use this product without any negative effects for my wife (every asthmatic is different but in our experience it was OK). With the second application the flea population dropped dramatically, and now after a few weeks seems to be decimated. I am so happy and this product was definitely an answer to our prayers.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Quick & Easy
    By Marcus in Waco, TX on September 14, 2014
    Verified Purchase

    Great product. The individual bottle was quick and easy to add to my pump sprayer and enough to cover my smaller backyard along with the inside of my house. I did not have a flea problem but do have two inside dogs, so I used the product as a precaution. So far so good!

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  • 3 of 5 Stars  First time use
    By John in 93003 on August 23, 2014
    Verified Purchase

    It's hard to evaluate IGR concentrate because I am using commercial spray can, diatomaceous earth, and vacuuming in combination IGR. California is having a problem with ants this year and fleas are a new feature of the season.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Great for fleas
    By James in Merced ca. on August 19, 2014
    Verified Purchase

    Had a bad flea problem outside didn't notice till I brought them in house I have 2 inside only cats. Sprayed with telstar 1/2 oz per gal.and I bottle of precore haven't seen a flea since been about a month

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  • 5 of 5 Stars  how to evaluate effectiveness
    By Alvin in N. Charleston on July 12, 2014
    Verified Purchase

    the chemicals are available to reduce the prevalence of fleas. however it is difficult for someone uneducated to method to conduct an evaluation of their effectiveness. I am presently using more than one product, but if i were not, also using a good set of curved jaw surgical hemostats mu dogs would be suffering a lot. it's as if someone were dropping a load of fleas in my yard on a regular basis.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  great stuff
    By Matador401 in holiday Fla on May 16, 2014
    Verified Purchase

    I walked through the house with white socks, looked down at my socks, must have been 20 fleas on each one, sprayed precor 3 times along with another chemical to wipe them out!!

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  • 2 of 2 people found this review helpful:

    5 of 5 Stars  Works like a charm
    By Robert in Franklin, KY on March 31, 2014

    It took about 2 weeks for the chemical to work, but the fleas that were terrorizing our home are completely gone. I only had to spray our baseboards, carpets, and fabric surfaces twice. We experienced no ill effects at all. I noticed that just about the time I stopped seeing them, the fleas that I did see were very large and very lethargic. So, if you spray Precor, that may give you a sign that it's doing it's intended purpose.

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Most Helpful Q&A's

October 18, 2009 Andrea asked:

QIs Precor IGR safe around dogs and cats?
I know you said Precor IGR is safe after it is dry. I have only hardwood floors in my house. Will it harm my dog who lays on them, even when it is dry?

ANo, once the Precor IGR is dry there is no worries about harm to a pet that lays on the surface.  Remember that Precor IGR is not an insecticide; it does not kill the insect.  It is a product that prevents adult insects from reproducing and is more of a pheremone type chemical that "messes" up the life cycle process of an insect.  It is very safe around children and pets and this is why it so popular to use these products in schools, day cares, and dog kennels.

24 of 24 people found this answer helpful.
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August 3, 2011 Lynn asked:

QWhat product can I purchase from you that can be mixed with Precor which will kill adult fleas?

ATengard SFR would be a great choice for flea control. Tengard SFR is labeled for broadcast sprays on carpets and other flooring and can be mixed with Precor IGR for flea control.

14 of 15 people found this answer helpful.
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November 29, 2009 Mary asked:

QI got Precor IGR on my skin. Is Precor IGR safe?
I read that methoprene (Precor IGR) is not toxic to humans. And it is found in some foods. I got this all over my body even in my hair and did not wash it off. What is the worse thing that could happen to me? Will I go bald and my skin sag?

AMethorprene (Precor IGR) is a very safe product that is non toxic to humans.  I'm sure you have showered off by now.  There should be no issues or worries with the product, it just needs to be washed off.

9 of 11 people found this answer helpful.
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September 28, 2012 Jeff from Beckley, Wv asked:

QIs it safe to apply Precor IGR to mattresses and box springs for flea control?

AYou do not need to actually spray the mattress and boxspring with Precor for it to effect fleas that may be hidden there. If you spray around the area where the bed is located the fleas will still be effected because of the unique molecules of this product. You should also thoroughly vacuum the bed to remove as many fleas eggs and larva as possible.

9 of 9 people found this answer helpful.
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June 21, 2010 Kristin asked:

QHow long does is take Precor IGR Concentrate to dry after application?
I need to treat 2 bedrooms, living room, and kitchen. I don't have anyplace in the house to stay while waiting for the product to dry, so I've got to find someplace to go. The length of time it will take to dry will affect my choice of place to go.

ATypically most liquid applications take about 30 mintues to dry.  Specific times will vary based on temperature in the home and other factors. 

8 of 9 people found this answer helpful.
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Most Recent Customer Questions

March 9, 2015 Cary from Lutz asked:

QMy pest guy used Precor to treat bed bugs in my daughters bedroom. I see it is labeled for fleas. I am going to do it myself now. What liquid should I use in my sprayer?


We cannot comment on the treatments performed by a professional but can tell you that Precor is an IGR (insect growth regulator) labeled only for flea treatments inside the home. The manufacturer of the product has another IGR in their product line that is labeled for bedbugs and it is called Gentrol. We carry this product on our website. You will add this product to a liquid concentrate insecticide that is labeled for bedbugs. It will take multiple products for treating this insect along with non-chemical methods. Below is an article that you might find extremely helpful. We also provide free expert advice by calling 866-581-7378 M-F 9-5PM EST.


How to Get Rid of Bedbugs Article

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March 5, 2015 Matthew from Philadelphia Pa. asked:

QWhen mixing Precor IGR with Demon Max, what temperature should the water be?

A The temperature is not an issue when mixing most products such as Precor IGR and Demon Max but most of the time we suggest something along the lines of warm or room temperature water.

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March 1, 2015 Matthew asked:

QCan I use this product on a tile floor and leather chair?

A Precor IGR can be used on tile floor and furniture where fleas are found, such as a leather chair. You will mix 1 fl. oz. per gallon of water.

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February 6, 2015 Lyn from Sarasota, Fl asked:

QWhat is best way to dispose of leftover precor igf mixture?

A According to the Precor IGR label, you should call your local solid waste agency for disposal instructions. It is not recommended to put the product down any indoor or outdoor drain.

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February 6, 2015 Lyn from Sarasota, Fl asked:

QWill vacuuming after application reduce the effectiveness of Precor IGR?

A No, vacuuming will not decrease the effectiveness of Precor IGR. Depending on what you are treating for, you are supposed to vacuum more than normal.

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November 12, 2014 Arla from Beaver Springs, Pa asked:

QI ordered a bottle of Precor concentrate. How safe is this for humans?
I ordered it online and just received it. When I reached inside I felt wetness. The cap was broken. I washed my hands immediately but was worried as to the effects on me. I guess I just worry that if it can make fleas sterile and break down their development, well what can it do to us? So my question is do I have anything to worry about?

A Precor IGR Concentrate is a insect specific hormone and is relatively safe around humans. However, if you have skin contact with Precor IGR Concentrate the Manufacturer Safety Data Sheet states that you should wash with plenty of soap and water and if irritation persists, get medical attention.

1 of 1 people found this answer helpful.
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October 27, 2014 Matt from Texas asked:

QCan I mix Precor and Temprid SC together to be sprayed at 1 time for flea control?

A Yes, you can mix Temprid SC and Precor IGR in one sprayer. After your treatment, make sure to vacuum every day for two weeks and do a second treatment with Temprid SC only. Another treatment may be required after the two initial treatments. We recommend using these products in a pump sprayer

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October 10, 2014 Wendy from Wakeman,oh asked:

QOnce I mix Precor concentrate with water, how long will it last once it is mixed with water?
If I have left over solution, can I use it again in 3 months when I treat again?

A Precor Concentrate should be used within 24 hours of mixing the product.

1 of 1 people found this answer helpful.
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August 30, 2014 John from Los Angeles, California asked:

QCan I use 32 oz spray bottles to spray precor igr on surfaces??

A Yes, you would dilute 1/4 ounce Precor per 32 ounce spray container.

1 of 1 people found this answer helpful.
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August 6, 2014 Lacey from Moore, Ok asked:

QSafety for toddler?
I am very concerned with using any chemicals in my house because I have a three-year-old the crawls all over the floor and touches the floor then puts his hands in his mouth on a regular basis. I have been looking at The Precor Pro for flea control and it seems to be a very effective product that is safe. We have a sudden major flea ingestion and more natural solutions have done nothing! My question is, is the precor pro or another precor product the safest solution and should this be mixed with another safe product to control the adult fleas? Or does the precor control them effectively as well? If another product is needed for adult flea control, which do you recommend that is completely safe?

A We would recommend using Precor 2000 Plus Premise Spray. It has an insect growth regular in it as well which is very important. It is like a birth control for the fleas. This product is safe once it is dry. It is not reactivated again if the floor gets wet. It is completely safe for your toddler to be on the floor once the product has dried completely. Please let us know if you have any additional questions.

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