What kind of herbicide is characterized as a foliage-applied and systemic?

• A. Photosynthesis inhibitor
• B. Contact herbicide
• C. Bud inhibitor herbicide
• D. Soil applied herbicide

Answer: (C)

The correct answer refers to a class of herbicides known as systemic herbicides, which are often applied to the foliage of plants. These herbicides are absorbed through the leaves and then translocate within the plant to affect various physiological processes.

In this context, a foliage-applied systemic herbicide specifically targets the internal functions of the plant after being absorbed. When the plant takes in the herbicide through its leaves, it disrupts key biological processes necessary for growth and reproduction, ultimately leading to the plant's demise. This mechanism contrasts with contact herbicides, which only affect the parts of the plant with which they come into direct contact and do not move within the plant.

Photosynthesis inhibitors target the process of photosynthesis directly, but they can be considered a type of systemic herbicide. However, the term "foliage-applied and systemic" specifically aligns better with broad-spectrum systemic herbicides that act once they are absorbed. Soil-applied herbicides, on the other hand, primarily work through the roots and are absorbed from the soil rather than the foliage.