How does a pre-emergent herbicide such as Spartan work?

Spartan Herbicide is a pre-emergent herbicide commonly used to control grassy and broadleaf weeds in various settings, such as lawns, turf, and ornamental landscapes. Its active ingredient is prodiamine, which works by inhibiting weed growth before it emerges from the soil. Here's how it works:

1. Application to Soil

  • Spartan is applied to the soil surface, where it forms a chemical barrier.

  • It is typically applied before weed seeds germinate, which is why it's called a "pre-emergent" herbicide.

2. Absorption by Weed Seeds

  • When weed seeds in the soil begin to germinate, they absorb the herbicide through their roots or shoots as they grow.

  • Prodiamine disrupts key enzymes and processes in the weed seedlings, preventing them from developing properly.

3. Mode of Action

  • Prodiamine inhibits the protoporphyrinogen oxidase (PPO) enzyme, which is essential for chlorophyll production and cell membrane integrity in plants.

  • Without this enzyme, the weed seedlings cannot produce energy through photosynthesis, and their cells are damaged by the accumulation of toxic compounds.

  • This causes the seedlings to die before they can emerge from the soil.

4. Selective Control

  • Spartan is selective in its action, meaning it targets specific weeds (both grassy and broadleaf) while sparing desirable plants, depending on the application rate and method.

  • It is particularly effective against tough weeds like nutsedge, spurge, and others.

5. Residual Activity

  • Spartan has residual activity, meaning it remains active in the soil for several months, depending on environmental conditions (e.g., rainfall, soil type, and temperature).

  • This extended control helps prevent new weed flushes over time.

Key Considerations:

  • Timing: Spartan must be applied before weed seeds germinate. Applying it too late (after weeds have emerged) will not be effective.

  • Soil Activation: Watering or rainfall after application helps move the herbicide into the soil where it can be absorbed by weed seeds.

  • Safety: Follow label instructions carefully to avoid damage to desirable plants and to ensure safe application.

In summary, Spartan Herbicide works by creating a chemical barrier in the soil that prevents weed seedlings from growing and surviving, offering long-lasting control of weeds before they become a visible problem.

For more information on Spartan please visit the link HERE

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