What is generally used to control perennial broadleaf weeds?

What is generally used to control perennial broadleaf weeds?

• A. Nonselective herbicides
• B. Preemergence herbicides
• C. Selective herbicides
• D. Systemic postemergence herbicides

Answer: (D)

Perennial broadleaf weeds are tough because they live from underground structures like roots, rhizomes, or crowns and can resprout after mowing. To truly control them, you need a product that moves within the plant to reach those underground parts. Systemic postemergence herbicides fit this need: they are absorbed through the foliage after the weed has emerged and are transported throughout the plant to the roots, crowns, or rhizomes. This translocation kills the entire weed, reducing the chance of regrowth, which is essential for perennials. In turf, these herbicides are typically selective for broadleaf weeds, sparing grasses, and are applied after weeds are actively growing. Preemergence products won’t affect established perennials since they prevent germination rather than kill existing plants, and nonselective products would damage or kill the desirable turf.

Perennial broadleaf weeds are tough because they live from underground structures like roots, rhizomes, or crowns and can resprout after mowing. To truly control them, you need a product that moves within the plant to reach those underground parts. Systemic postemergence herbicides fit this need: they are absorbed through the foliage after the weed has emerged and are transported throughout the plant to the roots, crowns, or rhizomes. This translocation kills the entire weed, reducing the chance of regrowth, which is essential for perennials. In turf, these herbicides are typically selective for broadleaf weeds, sparing grasses, and are applied after weeds are actively growing. Preemergence products won’t affect established perennials since they prevent germination rather than kill existing plants, and nonselective products would damage or kill the desirable turf.