Post-Emergent Selective

Types of Post-Emergent Selective Herbicides & Their Modes of Action

Post-emergent selective herbicides target specific types of weeds while sparing desirable grasses or crops. They are commonly used in lawns, pastures, row crops, and turf management.

Broadleaf-Selective Herbicides (Growth Regulators - Synthetic Auxins)

• Mode of Action: Mimic plant hormones (auxins), causing uncontrolled growth that leads to plant death.
• Examples on the Market:
  • GrazonNext HL (Aminopyralid + 2,4-D) – Controls broadleaf weeds in pastures.
  • WeedMaster (Dicamba + 2,4-D) – Effective against broadleaf weeds in rangeland.
  • SpeedZone (2,4-D + Dicamba + Carfentrazone + MCPP) – Fast-acting control for lawns and turf.

Grass-Selective Herbicides (Lipid Synthesis Inhibitors - ACCase Inhibitors)

• Mode of Action: Inhibits lipid production, stopping cell membrane formation in grassy weeds.
• Examples on the Market:
  • Fusilade II (Fluazifop-P-butyl) – Controls grassy weeds in landscape beds and nurseries.
  • Segment (Sethoxydim) – Targets grasses in broadleaf crops and ornamentals.
  • Acclaim Extra (Fenoxaprop-P-ethyl) – Used for grassy weed control in turfgrass.

Amino Acid Inhibitors (ALS Inhibitors)

• Mode of Action: Blocks essential amino acid production, preventing weed growth.
• Examples on the Market:
  • Celsius WG (Thiencarbazone + Iodosulfuron + Dicamba) – Controls broadleaf and grassy weeds in warm-season turf.
  • Escort XP (Metsulfuron-methyl) – Targets broadleaf weeds in pastures and non-crop areas.
  • Manor (Metsulfuron-methyl) – Controls broadleaf weeds in warm-season turfgrass.

Photosynthesis Inhibitors

• Mode of Action: Disrupts photosynthesis, starving the plant of energy.
• Examples on the Market:
  • Atrazine (Atrazine-based) – Controls broadleaf weeds in corn and turf.
  • Velpar L (Hexazinone) – Used for broadleaf and woody plant control.

Pigment Inhibitors

• Mode of Action: Blocks chlorophyll production, leading to white, bleached leaves and plant death.
• Examples on the Market:
  • Pylex (Topramezone) – Used in turfgrass to control tough broadleaf weeds.

These herbicides provide targeted weed control with minimal impact on desirable vegetation. Always follow label directions for best results.

At BES-TEX Supply, we are your go-to source for all your herbicide needs. Whether you're managing pastures, rangeland, or lawns, we have the right solutions to keep unwanted weeds under control. Visit us at 4512 Adobe Dr., San Angelo, TX 76903, or call 325.653.1300. Let us help you protect your land with the best herbicides available!