Triad QC Select Herbicide: Specs, Power, and Field Results
Julia Ellery 18 Oct 2026 9 min read ASIN B07XZN6XLR
This product against the Tools & Outdoors median
| Figure | This product | Category median | Where it sits |
|---|---|---|---|
| Our score Our score, out of 10. | 9.2/10 | 8.8/10 n=157 | 5% higher than the median |
| Spec fields published How many attributes the seller fills in on the listing. | 4 | 5.0 n=157 | 20% fewer than the median |
Medians are taken across the 157 published reviews in Tools & Outdoors; n on each row is how many of them publish that figure. The notch on every bar marks the median, so a fill reaching past the notch sits above it. Scores are out of 10, based on listed specifications and buyer feedback.
- Brand
- Select Source
- Our score
- 9.2/10
- Spec fields
- 4 attributes on the listing
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When aggressive summer annuals overrun an established yard, selecting an effective post-emergent broadleaf weed control solution becomes the primary objective for property owners. Lawns that missed a springtime pre-emergent barrier often experience severe infestations of dandelion, white clover, and mature summer crabgrass. In this detailed review, we examine whether Triad QC Select delivers the selective chemical power needed to clear unwanted foliage without damaging your underlying turf canopy. This liquid concentrate combines three active components to target problem species through foliar uptake and root absorption, making it a serious candidate for residential and commercial turf managers who need immediate knockdown.
Choosing the right selective herbicide requires matching your specific grass type with the product chemistry, and this formulation is designed primarily for cool-season and select warm-season turfgrass systems. Rather than buying multiple separate chemical concentrates to address broadleaf intruders and stubborn grassy plants, this blend offers an all-in-one treatment profile. Throughout this comprehensive triad qc select review, we break down chemical specifications, crabgrass developmental stages, mix calculations, field application precautions, and how this selective herbicide compares directly against competing options on the market.
What You Get With the Triad QC Select 96 words

Triad QC Select is packaged as a liquid concentrate intended for dilution inside a dedicated hand-pump, battery-powered, or commercial tank sprayer. The product arrives in a single jug manufactured by Prime Source, LLC, engineered for spot treatments or broadcast turf applications across several verified green spaces.
- One 32-fluid-ounce quart bottle of concentrated liquid herbicide
- Triple-action chemical formulation uniting 2,4-D, Dicamba, and Quinclorac
- Systemic absorption capability penetrating both plant leaves and root zones
- Selectivity across residential turf, sports complexes, parks, roadsides, and non-putting golf areas
- Late-season post-emergent capability targeting mature crabgrass past five tillers
Key Specifications 88 words
Reviewing the triad qc select specs allows turf managers to assess container volume, chemical identity, and operational suitability before loading their spray tanks.
Attribute Detail
- Brand Name
- Select Source
- Manufacturer
- Prime Source, LLC
- Active Ingredients
- 2,4-D, Dicamba, Quinclorac
- Liquid Volume
- 32 fluid ounces (1 Quart)
- Item Form
- Liquid Concentrate
- Item Weight
- 1.17 kg
- Model Number
- 51511PSQ121
- Part Number
- 51511PSQ121
- UPC
- 644216047451
- Application Sites
- Lawns, athletic fields, roadsides, parks, select golf turf
Fields the seller filled in on the Amazon listing (4)
- Size
- Quart
- Weight
- 2.5794084654 pounds
- Product Group
- Lawn & Patio
- Binding
- Unknown Binding
Targeted Post Emergent Broadleaf Weed Control and Grassy Weed Elimination 253 words
The core strength of this formula lies in the triad qc active ingredients working in synergy to attack cellular development across disparate weed varieties. Standard selective herbicides frequently address broadleaf weeds like dandelions and clover but fail entirely when confronted with grassy weeds. Triad QC Select bridges that performance gap by incorporating 2,4-D and Dicamba alongside Quinclorac. Synthetic auxins such as 2,4-D and Dicamba stimulate uncontrolled, abnormal cell division in broadleaf plants, resulting in twisting stems, cupping leaves, and eventual vascular collapse.
Meanwhile, the Quinclorac component supplies exceptional activity against difficult grassy invaders while also contributing supplementary control over tough broadleaf weeds like field bindweed and clover. Quinclorac works systemically; it is readily absorbed by foliage and taken up through root structures. Once translocated throughout the plant, it triggers an overproduction of ethylene and abscisic acid, halting cell wall biosynthesis and causing chlorosis. Because weeds absorb the formula from both above-ground leaves and subterranean roots, Triad QC Select exhibits higher post-emergent broadleaf weed control consistency on deep-rooted perennial weeds than single-mode options.
For groundskeepers maintaining recreational areas or manicured residential yards after trimming with an ego select cut lawn mower, having broadleaf and grassy targets covered in a single liquid pass saves considerable labor. Instead of spraying an amine broadleaf blend and subsequently waiting days to lay down a separate grassy weed killer, a single pass treats clover, dandelions, plantain, and creeping weeds simultaneously. The result is a unified clean-up sweep that clears unsightly patches without demanding multiple chemical applications across your property.
Managing Triad QC Select for Crabgrass at Different Growth Stages 244 words
Crabgrass represents one of the most persistent lawn challenges because its biological resilience increases drastically as the plant develops tillers throughout the warm summer months. Standard post-emergents often fail once crabgrass progresses beyond its tender seedling phase. Utilizing triad qc select for crabgrass offers a distinct operational advantage because the product label specifies activity across multiple maturity windows, ranging from freshly germinated 1- to 2-leaf stages, up through 1-tiller growth, and even extending to mature crabgrass that has reached 5 tillers or greater.
Early-stage crabgrass, defined by single leaves or tiny shoots, possesses a thin cuticular wax layer that allows Quinclorac to enter the vascular tissue rapidly. During this initial stage, targeted weeds display yellowing within several days and wither completely before establishing dense root crowns. However, when spring pre-emergent barriers fail or are skipped entirely, summer lawns often display sprawling crabgrass clusters that have matured well past five tillers. These large plants feature thick foliage and well-anchored root nodes that resist basic store-bought contact killers.
The systemic properties of this triad qc select herbicide formula ensure that mature 5-tiller plants transport the herbicide throughout their extensive vascular network. Complete vascular translocation is essential because leaving any root node intact allows crabgrass to regenerate from subterranean crowns. While mature crabgrass takes longer to desiccate than young shoots, the dual foliar and root uptake mechanics ensure the chemical reaches deep into the plant crown, providing reliable late-season cleanup when other selective sprays leave mature crabgrass standing.
Understanding Triad QC Select Mix Rate and Proper Application 252 words
Accurate spray preparation is crucial for achieving rapid weed mortality while avoiding unnecessary stress on your desirable grass species. When calculating the triad qc select mix rate, operators should recognize that the product listing does not specify a fixed fluid-ounce dilution per gallon on its overview data sheet, meaning users must always cross-reference the detailed container label for exact site-specific dosage rates. Herbicide concentration demands vary depending on whether you are managing an intensive broadcast sprayer across several acres or conducting precise spot treatments with a handheld wand.
Achieving uniform spray droplet coverage is essential when targeting smooth, waxy broadleaf surfaces and upright crabgrass blades. In agricultural and turf herbicide applications, adding an approved surfactant or methylated seed oil is standard practice when applying Quinclorac formulations to reduce surface tension and ensure droplets adhere to vertical leaves. Applying the chemical during calm atmospheric conditions prevents drift onto nearby ornamentals, garden shrubs, or non-target beds. Operating when temperatures remain moderate also optimizes chemical uptake, as weeds actively respirating under favorable daylight conditions translocate active ingredients far more efficiently.
Proper timing relative to cultural lawn care practices protects the turf canopy and maximizes leaf absorption. You should avoid cutting your grass immediately prior to or right after spraying; providing adequate blade surface area ensures sufficient chemical absorption. Maintaining healthy turf with equipment like an ego select cut xp ensures that desirable grasses recover swiftly and fill in bare soil voids left behind as targeted weeds wither, preventing opportunistic weed seeds from colonizing vacant spots.
Triad QC Select Lawn Safety and Approved Application Sites 219 words
Turf managers must prioritize turf tolerance, as applying non-selective or improperly calibrated chemicals can cause severe turf discoloration or permanent crown damage. The operational envelope for triad qc select lawn safety encompasses residential lawns, commercial properties, athletic fields, roadsides, municipal parks, and select golf course zones. However, the manufacturer specifically restricts use on sensitive golf course components, including putting greens, tees, and closely mowed collars, where short cutting heights and specialized bentgrass or bermudagrass strains cannot tolerate systemic auxins.
Tolerance varies between cool-season species such as Kentucky bluegrass, perennial ryegrass, and tall fescue, and warm-season grasses such as zoysiagrass or bermudagrass. Because 2,4-D and Dicamba can induce chlorosis or growth regulation side effects when misapplied to heat-stressed turf, applications should take place when the turf is actively growing and free from severe moisture deficits. Irrigating parched soil prior to spraying helps desirable turf withstand systemic chemical exposure, while targeted weed targets remain susceptible.
Adhering to site boundaries outlined by Prime Source, LLC prevents chemical movement into sensitive landscape areas. Roadsides, sports turf, and parklands benefit from the heavy-duty knock-down power of this three-way blend, especially where foot traffic or utility equipment routinely disturbs soil and encourages weed germination. Sticking to approved label sites protects fine turf investments while delivering clean, weed-free playing surfaces and visually appealing residential front lawns.
Triad QC Select Pros and Cons 44 words
Pros
Pros
- Three-way active ingredient formulation
- Foliage and root systemic absorption
- Targets mature and young crabgrass
- Controls broadleaf and grassy weeds
- Effective late-season cleanup option
Cons
- Prohibited on golf tees and greens
- Bottle does not include spray applicator
- Mix rates require careful label reading
Is the Triad QC Select Worth It 248 words
Determining whether this concentrated herbicide represents the ideal purchase depends on your property layout, existing weed population, and current lawn care regimen. If your turf has been overrun by a mixed invasion of mature crabgrass, persistent white clover, and deep-rooted dandelions due to a missed pre-emergent treatment, is triad qc select worth it? For property owners dealing with simultaneous grassy and broadleaf pressure, the answer is an emphatic yes. The convenience of combining three proven active ingredients into a single 32-ounce quart container saves time and eliminates the complex chemical tank-mixing that standard turf maintenance often demands.
Commercial landscapers and property caretakers who maintain athletic complexes, open park spaces, and sprawling residential acreage will find significant utility in its flexible broad-spectrum action. Its demonstrated ability to kill crabgrass at the five-tiller stage makes it an indispensable late-season rescue remedy when summer heat exposes turf deficiencies. Instead of surrendering to crabgrass dominance until winter frost arrives, this concentrated formulation offers a definitive corrective action that restores uniform turf appearance.
Conversely, property owners with tiny yard footprints or those battling only isolated, scattered broadleaf weeds may find a dedicated three-way Quinclorac blend more powerful than necessary. If your lawn has zero grassy weed issues and only displays occasional dandelion heads, a basic two-way broadleaf spray might suffice. But for serious turf enthusiasts, grounds managers, and acreage owners seeking professional-grade post-emergent power in an easy-to-store quart jug, Triad QC Select delivers elite chemical performance that reliably cleans up difficult turf problems.
Other Options to Consider 153 words
BASF Drive XLR8 Crabgrass Killer suits turf managers looking specifically for a dedicated, high-volume post-emergent grassy weed specialist powered by liquid Quinclorac with a 30-day residual profile, making it a focused alternative in a larger 64-ounce concentrate for buyers comparing triad qc vs drive xlr8 for pure crabgrass remediation without extra broadleaf actives built in.

Ranger Pro Herbicide Concentrate is engineered for property managers requiring total vegetation eradication rather than selective turf preservation, offering a large 2.5-gallon bulk supply of systemic glyphosate concentrate suited for clearing gravel driveways, fence lines, and non-crop utility perimeters where no green plant tissue should survive.
Tenacity Turf Herbicide provides unique specialty performance for homeowners overseeding or renovating cool-season turf, using its 8-ounce mesotrione formulation to deliver both selective pre-emergent and post-emergent suppression of specific problem weeds during delicate grass seeding windows where synthetic auxin blends could harm young seedlings.

FAQ 221 words
What active ingredients are inside Triad QC Select?
Triad QC Select contains three systemic active ingredients: 2,4-D, Dicamba, and Quinclorac. This specific three-way combination provides simultaneous broadleaf weed disruption and post-emergent control over stubborn grassy weeds like crabgrass.
Can Triad QC Select eliminate mature crabgrass?
Yes, the product is formulated to manage crabgrass across multiple growth benchmarks, from young 1- to 2-leaf seedlings and 1-tiller sprouts up to mature plants that have developed 5 tillers or more, making it an effective late-season cleanup option.
Where can this selective herbicide be safely applied?
Approved application sites include residential and non-residential turf, municipal parks, athletic complexes, roadsides, and select areas of golf courses. The product label prohibits use on golf course greens, tees, and collars.
Does Triad QC Select work through leaf contact or root absorption?
The Quinclorac and systemic auxins in this herbicide are absorbed both through the weed foliage and via root uptake, allowing the chemical to circulate internally through the vascular system to terminate target weeds completely.
What is the precise mix rate per gallon for spot spraying?
The overview listing does not specify a single fixed mix rate per gallon because dilution rates vary based on equipment type, grass species, and spot versus broadcast application. Users should always consult the booklet label on the 32-ounce bottle for exact application measurements.
The other listings this review names
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Ranger Pro Ranger++Ranger+Pro+Glyphosate++Herbicide++Concentrate++2.5+gal.
8.8/10 Our score 5 spec fields
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Tenacity Turf Herbicide - 8 ounces (Packaging may vary)
9.2/10 Our score 5 spec fields