What is a "preemergence incorporated" herbicide?

A "preemergence incorporated" herbicide refers to a type of weed control product that is applied to the soil before the weeds begin to sprout. The key aspect of this method is the incorporation of the herbicide into the soil, which is done to enhance its effectiveness and prevent weed seeds from germinating.

By being applied before weed emergence, the herbicide acts as a barrier to the development of new weed plants. When it is incorporated into the soil—often through methods like tilling or using a mechanical implement—it ensures that the active ingredient is in close contact with the weed seeds that are present in the soil. This strategic application helps maintain a weed-free environment for the desired plants, whether in turf or ornamental settings.

In contrast, the other choices do not accurately describe this type of herbicide application. For instance, applying herbicides after plants have emerged would be considered a post-emergent application, not preemergent. Similarly, while tilling is part of the process for incorporation, a "preemergence incorporated" herbicide specifically emphasizes treatment before weed emergence. Finally, spraying directly onto plants aligns more with spot treatments rather than the concept of preemergence, which focuses on soil-based prevention.