Which herbicide is applied to soil before weed germination?

Which herbicide is applied to soil before weed germination?

• A. Preemergence herbicide
• B. Postemergence herbicide
• C. Selective herbicide
• D. Non-selective herbicide

Answer: (A)

Timing of herbicide application matters: some products are designed to work before weeds sprout, while others are used after they’ve emerged. The correct choice describes a preemergence herbicide, which is applied to the soil before weed seeds germinate. It sits in the upper soil layer and creates a barrier or inhibits the early growth of seedlings so they never become visible weeds. This approach is especially common for preventing seeds like crabgrass from establishing in turf. Postemergence herbicides, by contrast, are used after weeds have already emerged, so they wouldn’t be correct for a scenario focused on preventing germination. The terms selective and non-selective refer to the range of plants the herbicide will kill, not the timing of application, so they don’t define this situation.

Timing of herbicide application matters: some products are designed to work before weeds sprout, while others are used after they’ve emerged. The correct choice describes a preemergence herbicide, which is applied to the soil before weed seeds germinate. It sits in the upper soil layer and creates a barrier or inhibits the early growth of seedlings so they never become visible weeds. This approach is especially common for preventing seeds like crabgrass from establishing in turf.

Postemergence herbicides, by contrast, are used after weeds have already emerged, so they wouldn’t be correct for a scenario focused on preventing germination. The terms selective and non-selective refer to the range of plants the herbicide will kill, not the timing of application, so they don’t define this situation.