Welcome to Do-It-Yourself Pest Control

Q4 Plus Turf Herbicide

Walt Cline - Pest Control Professional Pro Tip: "Q 4 Plus controls crabgrass AND broadleaf weeds in many different lawn grasses... but it's not for use on St Augustine or Centipede grass. For more information on crabgrass click here."

Keep Reading...

More Views

Q4 Plus Turf Herbicide

Availability: In stock

Q4 Plus Turf Herbicide has four active ingredients to control yellow nutsedge, crabgrass, foxtail, certain grassy weeds, and other troublesome broadleaf weeds in cool-season turf areas.

Prop65 California Proposition 65 WARNING

Q4 Plus Turf Herbicide-Gallon

Q4 Plus Turf Herbicide- QT

  • Buy 2 for $45.50 each and save 3%
Q4 Plus Turf Herbicide-Gallon

Q4 Plus Turf Herbicide - Gallon

  • Buy 2 for $121.50 each and save 3%
Q4 Plus Turf Herbicide-Gallon

Q4 Plus Turf Herbicide - 2.5 Gallon

  • Buy 2 for $298.50 each and save 2%



Q4 Plus Turf Herbicide

Q4 Turf Herbicide has been replaced by Q 4 Plus Turf Herbicide

Q4 Plus Turf Herbicide is a selective post-emergent herbicide. That means that it kills selective weeds and works after the weed has sprouted. Q4 Plus has a combination of four actives: Quinclorac, Sulfentrazone, 2,4,-D and Dicamba for a powerful knockdown on grassy and broadleaf weeds. This special formulation makes it unique among herbicides getting quick results with a broad although selective range of irritating weeds. Q4 Plus Turf Herbicide controls yellow nutsedge, crabgrass, foxtail, certain grassy weeds, and other troublesome broadleaf weeds in cool-season turf areas.

Mode of Action and Symptoms of Q4 Plus

The effects of Q4 Plus begin with stunting, then a gradual reddening and yellowing followed by plant death.

The Quinclorac is absorbed through the root system and the other 3 active ingredients are contact herbicides, giving you multiple modes of action.

Q4 Plus Turf Herbicide Features

  • Rain fast in 6 hours
  • May apply up to 90 degree F
  • Post-emergence control of of grassy and broadleaf weeds
  • Extra knockdown power of grassy weeds
  • Labeling includes use on bermudagrass
  • Wide window of application for broadleaf weeds
  • Fast visual response-within 24-48 hours
  • Protox inhibitor activity for rapid desiccation and death of broadleaf weeds
  • Technical Bulletin
Additional Information

Additional Information

Pro Tips Q 4 Plus controls crabgrass AND broadleaf weeds in many different lawn grasses... but it's not for use on St Augustine or Centipede grass. For more information on crabgrass click here.
Packaging Qt and Gallons
Manufacturer PBI Gordon
Product Label Label
More PDF's No
Target Pest Controls yellow nutsedge, crabgrass, foxtail, certain grassy weeds, and other troublesome broadleaf weeds in cool-season turf areas
Active Ingredient (s) Quinclorac 8.43% Sulfentrazone 0.69% 2,4-D, dimethylamine salt 11.81% Dicamba, dimethylamine salt 1.49%
For Use : Use sites include golf courses, lawns, cemeteries, public parks, sports turf, sod farms and other sites.
Yield N/A
Mixture|Application 5-8 pints per acre or 1.8 - 3 oz. per 1000 sq. ft. depending on target and turf. See label for all dilution rates.
Application No
Retreatment 4 week reseeding interval
Shipping Restrictions (Qts):AK, HI, MA, NM, NY ; (Gal):AK, HI, LA, MA, NM, NY, TX ; (2.5 G) AK, CA, HI, LA, MA, NM, NY, TX, WA
More Instructions No

Customer Reviews 23 item(s)

Best Product I have used
This is the best product I have ever used on my zoysia lawn in northern Florida. Always good service from DIY.
Review by Florida Gent / (Posted on 6/20/2020)
Excellent product
This the second year using product. Within a few days all weeds were killed. A second treatment will need to be applied because I have some weeds starting to sprout up again.
Review by WildBill / (Posted on 5/5/2020)
Great product, quick acting.
This product is amazing! All the weeds that were sprayed were dead within days of application. This quick acting herbicide significantly helped us during the fall growing season. I would highly recommend!
Review by MP / (Posted on 10/1/2019)
Worked on pennywort and more
By early fall large areas of the lawn were taken over by pennywort and less by clover. Q4 Plus took about 10 days for results, but was very effective when mixed on the higher side of the recommended range. It also took care of small patches of crab grass and nutsedge. It did not harm the grass, which is already coming back in the areas where the pennywort and clover had taken over. Happier than I had expected to be with the results; was starting to think it wasn't effective when I didn't see much difference after the first 5 days. Used a tank sprayer in part and a hose sprayer for the larger areas.
Review by Tom D / (Posted on 10/18/2018)
Met expectations
Worked very. Got rid of tough violets.
Review by Michele / (Posted on 10/4/2018)
Bulletproof Crabgrass and Clover Killer
None of the big box store products would control a major breakout of crabgrass, clover, carpetweed. We have a great lawn and these weeds were spreading fast. Within 24 hours the crabgrass and other weeds were dead and stayed dead. In 48 hours all the weeds were shriveled and gone.

I used a one gallon pump sprayer to apply the product. I thoroughly sprayed the infested area and spot sprayed any other weeds in other parts of my yard. A little product goes a long way. Our lawn is bermudagrass and there was little to no discoloration or damage to the lawn.
Review by atrain68 / (Posted on 10/3/2018)
My Goose is cooked!!
My main focus for this purchase was the post emergent eradication of Goose Grass at all tiller stages. After one treatment I saw significant elimination of 1-3 tiller stages and severe injury to 4+ after 2 weeks. I retreated the 4+ areas rather than wait to see if they eventually would die. This is the first product I have found with this level of success on Goose Grass. I would highly recommend it.
Review by Axle Bender / (Posted on 10/3/2017)
Finally found a product that works. RU just wasn't working on some tough deep rooted weeds. This does Great price too.
Looked For many years for weeds RU wouldn't kill. Finally found Q4!
Review by RW75 / (Posted on 9/25/2017)
2-4-D on steroids
Worked very well as advertised. It's a step up from just 2-4-D alone. My results started to show in 24 hours. It's been a couple of weeks now and I've seen more unwanted weeds turning color. Slight stress shows on lawn, maybe a little higher than just 2-4-D so follow application instructions carefully.
Review by Anthony / (Posted on 8/28/2017)
Killed most weeds and broadleaf .
Love this stuff , am ordering more !
Review by CW / (Posted on 5/26/2017)
Review by ALLEN / (Posted on 5/1/2017)
Great product, Great Company
Could not be more pleased with my purchase & experience with this product and customer service. Was provided all the information I needed and asked for to get the job done!
Review by AndyL84 / (Posted on 4/29/2017)
Pricing, customer service, and Q4 Plus Turf Herbicide
Do-It-Yourself has the best price on Q4 Plus Turf Herbicide because I checked all weed & feed stores in my area and every site that carries this product. The customer service is awesome in making sure you get the product that's right for your type of lawn and they walk you through how to apply the product. The products were delivered very quickly. About a month ago I ordered this product plus some Mark Blue, for my Bermuda grass it arrived the next day to my home in protective packing. This product is great! My husband applied it almost 3 weeks ago and most of the weeds are dying already. I will be ordering from you in the future. Thanks again.
Review by Janis / (Posted on 3/17/2017)
Q4Plus herbicide
I'm very satisfied with the product. I applied using the mixture for cool weather application,within a few days I noticed the weeds had begun to wilt. Very satisfied with product!
Review by Chick Mechanicsville,Md. / (Posted on 3/1/2017)
Slow acting But boy it's deadly
I did not notice the result of my application until about a week later but all the weeds in the area I sprayed were dead while the grass were all spared. I used to apply round-up on tough weeds and while you'll notice results after a day, it also kills anything it touches including my grass.

Before purchasing Q4 Plus, I spray one chem for crabgrass, round up for tough weeds, another for Oxalis, and another broadleaf weeds. With this product, one application does it all (well, mostly). One thing to be aware, it has a little stronger odor than big box store variety.
Review by Ron_g / (Posted on 8/28/2016)
Just got it and started using this product - time will tell, but neighbor said it was a great product
Review by allen / (Posted on 7/29/2016)
Excellent general purpose weed killer.
I love this stuff as it is made up of 4 (as in Q4) different weed killers. As such, it takes care of everything from crabgrass to dandelions. My landscaper recommended this and I love it.
Review by knay / (Posted on 5/10/2016)
A good product Q4.
Review by Randy / (Posted on 5/9/2016)
It works!
Our lawn is Bermuda, used other products and also professional companies with little to no results on the Crab Grass. Used the product as directed, it works, in 3 to 4 days you could see the the start of the Crab Grass being killed, within 2 weeks it was dead. Did not affect the Bermuda. S.E. Georgia.

Review by Ron / (Posted on 10/1/2015)
Excellent product
Used Q4 to kill multiple types of weeds in my lawn and landscaping which was a jungle. Once applied it took about two weeks for the weeds to disappear but was very effective. Getting ready to order more.
Review by irishman / (Posted on 9/4/2015)
good product
I live in southeast texas where st. Augustine is a grass and not a weed! so this is abig deal for me! I also have a small area where I grow Bermuda grass. I bought the product for that area to kill a variety of weeds. I had always used MSMA before but since it was banned for sale to consumers I had t find something else. I have finally found something that works.

this is good stuff. it killed everything I needed (most specifically the Virginia buttonweed) and it did not harm the Bermuda. there is one broad leaf grass that I cannot identify that took three applications to kill, but even it is gone now.

I highly recommend this product for the control of weeds in your lawn.
Review by brewzer / (Posted on 10/30/2014)
Excellent product for my needs
I bought this Q4 Plus to kill a Virginia Buttonweed weed which had come back in my grass. This weed is very difficult to kill, I used Roundup on it last season, killing the weed and the grass. I re-seeded the yard, and this year the Buttonweed came back. After applying Q4 Plus for the first time, initially I did not see results, but a week later the Buttonweed was dying. Another application and another week did the job. The fescue grass turned brown in the area of application, but it did not die completely. Overall, this product did what I bought it to do, don't expect the weeds to die as rapidly as they do when you use Roundup, just give it a little time to work. The technical service at Do It Yourself Pest Control was excellent when I called to discuss the product with them.
Review by jgh7328 / (Posted on 7/13/2014)
An excellent broad leaf killer for my fesuce lawn
I am a chemical engineer, I live NC and I am lawn guy. I have been using similar products for over 20 years. When applied per instruction to fescue, 2.6 oz per gallon and spray temp below 80 F, it does a marvelous job on killing 99% of the weeds in my fescue lawn and doesn't affect the fescue. This new formulation also kills crabgrass. Other than allowing for the use of this product on warmer days, I don't know how it could be improved upon. I highly recommend it for mature fescue..
Review by Tennjed / (Posted on 4/30/2014)

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.