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Q4 Plus Turf Herbicide for Grassy and Broadleaf Weeds is a weed killer that contains four powerful active ingredients – quinclorac, sulfentrazone, 2,4-D, and dicamba. This combination controls crabgrass, yellow nutsedge, and broadleaf weeds making it a versatile all-in-one product. Q4 Plus is highly selective on cool-season turf grasses. It is labeled for use on turf species including bluegrasses, ryegrass, tall fescues, and bermudagrass. Q4 Plus herbicide is rain-fast in 6 hours and has a 4 week reseeding interval.
Per the product label: Turfgrass tolerance to this product may vary and temporary turfgrass yellowing may occur on fine fescues, Bermudagrass, and zoysiagrass (see specific Bermudagrass and zoysiagrass sections). Apply only to fine fescue when it is part of a mixed stand of cool-season turf/cool-season blends. Tolerant turf species listed on this label may exhibit temporary turf injury. The best tolerance occurs under optimal conditions for the turfgrass.
For use in California: Biotypes of large and smooth crabgrass in California have shown varied response to this product. If control failure occurs following a full or split application, DO NOT reapply this product. Change to a herbicide with a different mode of action.
Product Documents
| Active Ingredient | 2,4-D, dimethylamine salt 11.81%, Dicamba, dimethylamine salt 1.49%, Quinclorac 8.43%, Sulfentrazone 0.69% |
|---|---|
| Target pests |
Barnyard grass, Bull Thistle, Chickweed, Clovers, Crabgrass (large & smooth), Dandelion, Nutsedge yellow, Signalgrass and others * See label for complete list |
| For use in |
Golf Courses, Commercial and Residential Lawns, Cemeteries, Public Parks, Sports Turf, Sod Farms and others * See label for complete list |
| Application |
Cool Season Grasses: 2.6 - 3 oz. per 1,000 sq. ft. (7 - 8 pints per acre) Warm Season Grasses: 1.8 - 2.6 oz. per 1,000 sq. ft. (5 - 7 pints per acre) * See label for complete application instructions |
| Pet safe | Yes, if used as directed on label |
| Formulation | Professional Product |
| NOT FOR SALE TO |
AK, HI, PR MA, NY (Restricted To Licensed Applicators Only) LA, TX (1 & 2.5 Gallon Sizes Restricted To Licensed Applicators Only) CA, WA (2.5 Gallon Size Restricted) |
| Shipping Weight | 2.55 lbs |
| Manufacturer | PBI Gordon Corporation |
| UPC | 070251697878 |
| EPA Registration | 2217-930 |
Post Emergent Control of Grassy Weeds
Q4 Plus Turf Herbicide for Grassy & Broadleaf Weeds can provide post-emergent control and suppression of the grassy weeds listed. Apply to weeds during the growth stages. Applications under adequate soil moisture conditions are preferred. Early summer treatments are generally more effective. Applications in the summer (approximately July 15 to August 15) to older, drought stressed grassy weeds are less effective. Late summer applications (after August 15) to mature crabgrass can be very effective. Weed control is affected by the spray volume, timing and the weed growth stages.
Post Emergent Control of Broadleaf Weeds
Apply this product to broadleaf weeds that are young and actively growing for the best results. Spring and fall treatments under adequate soil moisture conditions are preferred to the summer treatments. Generally, summer broadcast applications to older, drought stressed weeds are less effective. Fall applications provide improved control for emerged winter annuals and perennials such as henbit, chickweed, clover and ground ivy.
SPOT TREATMENTS:
Great product
By Edward on 05/04/2013
This worked great to kill all the weeds and crabgrass in my 1 acre yard. I used late August of 2012. Used ratio as recommended on label in a 15 gallon tow behind sprayer. I had a little left, so I watered down maybe 1 gallon of the mixture to fill my 15 gallon tank, and it still killed alot of the crabgrass in my neighbors yard. Would buy again.
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60 of 65 people found this review helpful
Great results
By Kelley on 03/26/2012
Verified Purchase
It Works when other stuff failed
By Anonymous on 08/08/2013
Verified Purchase
I would agree with some of the other comments-there is some investment up front-but it's cheaper than hiring someone and it works. I tried other stuff from Lowes and Home Depot with no luck. Used it in hot weather but had little damage to my Bermuda grass. It killed some pretty large patches of crab grass and other weeds. Pay attention to the proper mix. Would buy again
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46 of 49 people found this review helpful
Great Stuff
By Anonymous on 06/09/2013
Verified Purchase
Worked Great
By Anonymous on 07/21/2013
Verified Purchase
Q4 worked great for the broadleaf weeds and blanket crabgrass in my bermuda lawn. Didn't damage the bermuda much, even though I sprayed when the temps were hot. It didn't work well on the large-leaf crabgrass, but it completly killed the low-growing blanket crabgrass.
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29 of 31 people found this review helpful
I was using SpeedZone for the last few years but I can only find the gallon size now. Since this is too much for my small yard, is this Q4 a good alternative with similar results like SpeedZone or do you recommend another product? I have Bermuda Grass in Austin,TX.
Yes, Q4 Plus Turf Herbicide should work similarly to Speedzone but with grassy weed control as well. Another alternative would be Ferti-lome Weed Free Zone. Both products are safe for Bermuda but you will need to check the label of both to ensure they target the weeds you trying to control
I need to kill groundsel (Q4 is effective) and lepidium (Celsius is effective). Can I mix both together?
We do not recommend mixing anything with the Q4 Plus Turf Herbicide as it has 4 active ingredients and could counteract other herbicides.
Will this damage St Augustine & Centipede in the month of October?
Q4 Turf Herbicide should not be applied to Centipede or St Augustine turf.
The deers tongue grows somewhat like nimblewill and spreads rapidly. Tenacity herbicide has no effect on it whatsoever. Is there herbicide that will control deers tongue?
Q4 Plus is not labeled to control deers tongue grass.
The only thing we are aware of to get rid of deer tongue grass is a non selective such as Roundup QuikPRO. Otherwise, we recommend contacting your local extension office to see if they know of anything else,
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If you will be seeding the area, turf species listed on the product label can be seeded one week after the application of the Q4 Plus Turf Herbicide.
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0 of 1 people found this answer helpful
Is there a product that kills spurge roots?
Can Q4 Plus and TZone SE be mixed and applied together? If not, I already have TZone and am looking for something to safely add and spray together that will kill established Crabgrass. Thank you.
We wouldn't recommend mixing Q4 Plus Turf Herbicide with TZone as they both have the same active ingredients with Q4 containing 1 extra. The combination would burn your lawn. At this time (August), it would be best to apply a pre-emergent in the spring as anything applied to the crabgrass right now would have little effect.
Unfortunately, creeping chaffweed (also known as Khaki weed) isnt a listed targeted weed on the label.
The only post emergent we carry labeled for khaki weed is Monument 75WG Herbicide which is pretty expensive. Please note this product is designed for use on larger areas and is not availble in smaller sizes. We suggest speaking with your county extension office for advice on what others in your area may be using.Q4 Plus Turf is labeled to control morning glory. It is best applied whenever weeds are actively growing and healthy. Best when they are young. You would just apply early morning before temperatures reach too high during the day.
Specifically I have a backyard putting green. It is Penncross PC2.0 Creeping Bentgrass. I am getting some crabgrass, goose grass, and nutsedge infiltration. I have used Q4 on my regular fescue/Kentucky blue/rye lawn with great success. I am wondering if I can use this safely on bentgrass as well.
Per the label Q4 Plus Turf Herbicide is not safe for use on bent grass.
I have weeds growing close to my peonies, and I’m concerned that this will kill them.
You should avoid applying Q4 Plus Turf Herbicide where there are desired ornamentals, shrubs, trees, groundcovers, flowers and landscaped beds. It should only be applied to listed, established turfgrasses for the targeted weeds as directed.
I have lots of weeds within my junipers and I'm wondering if I spray the weeds if it will kill my junipers.
Q4 Plus Turf Herbicide is not labeled to be used around ornamentals/groundcover as it could injure them. It is only for use in turfgrass areas.
Lontrel Turf and Ornamental Herbicide product label can safely be applied to Shore Juniper, Blue Rug Juniper, and Blue Star Juniper as a direct or over the top spray for broadleaf weeds
Grass Out Max will not harm juniper when used as directed on the product label to treat for grassy weeds.Dandelions
Q4 Plus Turf Herbicide is labeled for Dandelion
A post-emergent such as Q4 Plus Turf Herbicide can be applied at the same time as a pre-emergent or 2-3 days after an application. You just need to make sure the temperatures are above 55 degrees for the most effect treatment.
The application rate of Q4 Plus Turf Herbicide varies depending on what type of truf grass you have. Cool Season Grasses: 2.6 - 3 oz. per 1,000 sq. ft. (7 - 8 pints per acre) Warm Season Grasses: 1.8 - 2.6 oz. per 1,000 sq. ft. (5 - 7 pints per acre)
Repeat treatments can be done at 30 days but you are limited to 2 broadcast applications a year but you can spot treat up to the max rate per area per year as directed on the product label.
Q4 Plus Turf Herbicide
Rating: 4.5 (127 Reviews / 238 Q&A)
