Which statement describes a characteristic of translocated (systemic) herbicides applied foliarly?

Which statement describes a characteristic of translocated (systemic) herbicides applied foliarly?

• A. They move through the plant system in water and food streams to accumulate in active growth centers.
• B. They stay where they are sprayed and kill only the sprayed leaf.
• C. They act immediately upon contact with leaf tissue.
• D. They are never absorbed by roots.

Answer: (A)

Systemic (translocated) herbicides, once absorbed through the leaf, travel inside the plant via the vascular system. They move with the plant’s water and nutrient streams to actively growing tissues, such as meristems and new leaves, where they disrupt essential processes and eventually kill the whole plant. This is why foliar applications of systemic herbicides can affect parts of the plant that were not sprayed directly. The description that best fits this behavior is that they move through the plant system in water and food streams to accumulate in active growth centers. In contrast, products that stay on the surface kill only the sprayed leaf and do not move to other parts; systemic products do not act immediately upon contact and require time for translocation; and it’s not accurate to say they are never absorbed by roots, since movement within the plant can involve multiple uptake pathways.

Systemic (translocated) herbicides, once absorbed through the leaf, travel inside the plant via the vascular system. They move with the plant’s water and nutrient streams to actively growing tissues, such as meristems and new leaves, where they disrupt essential processes and eventually kill the whole plant. This is why foliar applications of systemic herbicides can affect parts of the plant that were not sprayed directly. The description that best fits this behavior is that they move through the plant system in water and food streams to accumulate in active growth centers. In contrast, products that stay on the surface kill only the sprayed leaf and do not move to other parts; systemic products do not act immediately upon contact and require time for translocation; and it’s not accurate to say they are never absorbed by roots, since movement within the plant can involve multiple uptake pathways.