The gist:
- Three-way herbicides combine three selective active ingredients, typically 2,4-D, MCPA, and dicamba, to control a broad range of hard-to-kill broadleaf weeds in turf.
- They work best on actively growing weeds during warm weather and are labeled for use on cool- and warm-season grasses.
- Application timing, dilution rate, and avoiding drift onto desirable plants all affect how well the product performs.
A three-way herbicide is a selective post-emergent weed control product that blends three active ingredients into a single formula to target broadleaf weeds without harming most established turfgrass. The combination approach allows each ingredient to act on different weed physiology, which broadens the range of species controlled compared to a single-ingredient product.
Three-Way Herbicides at ProSolutions, such as Triad Select, combine three selective herbicide active ingredients to help control a wide range of difficult-to-manage broadleaf weeds, including clover, dandelion, and plantain. This formulation contains 2,4-D at 30.89%, dicamba dimethylamine salt at 2.77%, and MCPA dimethylamine salt at 8.23%. By combining these ingredients, Triad Select offers a multi-ingredient approach to broadleaf weed management in approved application areas. Professional applicators should review the product label for application rates, target weeds, restrictions, and safety requirements before use.
How the Three Active Ingredients Work Together
Each ingredient in a three-way formula belongs to the synthetic auxin herbicide class, but they target slightly different weed types and growth stages. Combining them improves overall control and reduces the chance that any single resistant weed species survives treatment.
- 2,4-D controls many common broadleaf weeds and has a long history of use in turf management.
- MCPA offers similar broadleaf control and is often chosen in situations where 2,4-D use is restricted.
- Dicamba adds activity against certain weeds the other two ingredients control less effectively, including some woody or perennial species.
2,4-D, MCPA, and dicamba are classified as Group 4 herbicides, synthetic auxin compounds, meaning they mimic natural plant growth hormones and cause abnormal, uncontrolled growth in susceptible broadleaf weeds until the plant dies. This mode of action is well documented in official pesticide labeling. Because all three ingredients share the same mode of action group, rotating to a different herbicide class over time can help manage resistance risk, a point addressed in EPA pesticide product labeling for similar dicamba and 2,4-D combination products.
When to Apply Three-Way Herbicides
Timing and weed growth stage matter more than almost any other factor in three-way herbicide performance. Most labels recommend application when target weeds are actively growing rather than dormant or stressed.
1. Apply when weeds have reached full leaf growth in spring through early fall, before plants begin going dormant.
2. Treat young, actively growing weeds for the most consistent kill.
3. Avoid application during extreme heat, drought stress, or when rain is expected within a few hours.
4. Use a non-ionic surfactant to improve coverage and absorption on waxy or hairy leaf surfaces.
Application should occur anytime between the time when the plants come into full leaf in spring to when the plants begin to go dormant, with best results obtained when the weeds are young and actively growing. These products are mixed in water and applied as a foliar spray, meaning the chemical is absorbed through the leaf surface rather than through the soil.
Where Three-Way Herbicides Are Labeled for Use
Three-way broadleaf herbicides are formulated for a range of managed turf and non-crop sites, which makes them a common choice for both homeowners and commercial applicators across the USA. Confirming the labeled use sites before application helps avoid misuse on unapproved surfaces.
|
Labeled Use Site |
Typical Application |
|
Residential and institutional lawns |
General broadleaf weed control in home turf |
|
Golf courses and athletic fields |
Fairways, roughs, tees, and sports turf |
|
Sod farms |
Weed suppression during turf production |
|
Rights-of-way and non-cropland |
Woody brush and broadleaf control along roadsides |
Three-way herbicide performance has been demonstrated and confirmed through university trials as an efficient and effective solution that can be administered to both cool and warm season types of grasses, and is labeled for use on sod farms, turf, and other non-crop industrial areas. The formula can also be mixed in a tank with liquid iron materials or liquid fertilizers following label instructions for compatibility, and it has flexible application rates that may be applied to non-cropland areas’ woody brush.
Frequently Asked Questions
Do three-way herbicides harm grass? Three-way herbicides are selective, meaning they are designed to control broadleaf weeds while leaving labeled turfgrass species unharmed when applied at the correct rate.
Can three-way herbicides be mixed with fertilizer? Some formulas can be tank-mixed with liquid iron or liquid fertilizer, but the product label should always be checked first for compatibility instructions.
How long does it take to see results after applying a three-way herbicide? Visible wilting and browning in treated weeds typically begins within days of application, though full control can take one to two weeks depending on weed species and growing conditions.
Is a surfactant required with three-way herbicides? A surfactant is not always mandatory, but adding a non-ionic surfactant generally improves how well the spray sticks to and is absorbed by weed foliage.
ProSolutions (Find ProSolutions on Google Maps) is based in Tennessee and lists herbicides, including selective broadleaf products, among its lawn and turf care categories.
ProSolutions offers professional-grade herbicides and lawn care products, including selective broadleaf weed control options such as Triad Select. Visit ProSolutions on Google Maps to view business information, contact details, and directions.
