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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) WA (2.5 Gallon Size Restricted To Licensed Applicators Only) |
| 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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55 of 60 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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43 of 46 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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27 of 29 people found this review helpful
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285 of 316 people found this answer helpful
What is good outdoor temperature to spray in? What is too cold?
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240 of 248 people found this answer helpful
We have a family dog that likes to go in the backyard, but are worried that something this extreme may make him unable to be outside. Is it safe? Once it's dry is it safe? This came highly recommended, but the person recommending it didn't know how it might effect pets.
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181 of 195 people found this answer helpful
If you will be reseeding 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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163 of 171 people found this answer helpful
I have fescue grass with many types of weeds I am new to treat lawns so I need help choosing a product. I have a lot of green clover and dandelion. I have sprayed amine 400(2,4-D) but it has not really done the perfect job I seen the dandelion die but clover is unaffected by this product.
Q4 Plus Turf Herbicide
Rating: 4.5 (120 Reviews / 187 Q&A)
