Prepare for the Texas FFA Nursery Landscape Exam with flashcards and multiple-choice questions. Each question comes with hints and explanations. Start your journey towards certification!

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A post-emergent herbicide is applied:

  1. before the weed seeds germinate

  2. to broadleaf weeds only

  3. just as the weed seeds are germinating

  4. after the weeds have germinated and emerged from the soil

The correct answer is: after the weeds have germinated and emerged from the soil

A post-emergent herbicide is specifically designed to target weeds that have already germinated and emerged from the soil. This type of herbicide is effective at controlling established weeds, allowing for direct application to the plants that are actively growing above the soil's surface. When selecting herbicides, understanding the timing of application is critical for effective weed management. In this case, applying the herbicide after the weeds have emerged ensures that the active ingredients can be absorbed by the weeds, leading to their death. The other choices reflect different concepts of herbicide application. For instance, applying before germination pertains to pre-emergent herbicides, which prevent seed germination and establishment. Similarly, targeting only broadleaf weeds restricts the scope of action and doesn't define the timing of application. Lastly, application during germination does not address the fact that the weeds must be visible and actively growing for post-emergent herbicides to be effective.