What is a major disadvantage of injection?

What is a major disadvantage of injection?

• A. Uneven distribution and wide safety margin
• B. Uneven distribution and narrow safety margin
• C. High equipment cost
• D. Slow uptake in leaves

Answer: (B)

When a pesticide is delivered by injection, the aim is to move the chemical systemically through the plant’s vascular system to reach target sites. But movement through xylem and phloem is uneven and highly dependent on plant species, size, season, and tissue condition. As a result, some parts of the plant may receive a high concentration while others get little or none, leading to inconsistent protection or control. The safety margin is also a critical factor. The effective dose is often close to the amount that can cause phytotoxicity, so a small dosing error or variation in uptake can result in injury to the plant or insufficient pest control. That combination of uneven distribution and a narrow safety margin makes injection a risky and less reliable method in many ornamental and turf situations. High equipment cost and slow uptake in leaves are less central to the main drawback here, and injection is not about leaf uptake since it bypasses foliar entry.

When a pesticide is delivered by injection, the aim is to move the chemical systemically through the plant’s vascular system to reach target sites. But movement through xylem and phloem is uneven and highly dependent on plant species, size, season, and tissue condition. As a result, some parts of the plant may receive a high concentration while others get little or none, leading to inconsistent protection or control.

The safety margin is also a critical factor. The effective dose is often close to the amount that can cause phytotoxicity, so a small dosing error or variation in uptake can result in injury to the plant or insufficient pest control. That combination of uneven distribution and a narrow safety margin makes injection a risky and less reliable method in many ornamental and turf situations.

High equipment cost and slow uptake in leaves are less central to the main drawback here, and injection is not about leaf uptake since it bypasses foliar entry.