Which of the following is an advantage of soil injectors, beyond minimal drift?

• A. Some soil systemic insecticides can give more persistent control than foliar treatments
• B. They are inexpensive
• C. They need no maintenance
• D. They do not affect non-target organisms

Answer: (A)

The main idea is that soil injectors enable root uptake of systemic insecticides, delivering protection from within the plant for a longer period than foliar sprays. When a systemic product is placed in the soil near the root zone, the plant roots absorb it and transport it through its vascular system. This can provide extended, internal protection as the chemical remains active in plant tissues and in the soil around the roots, leading to longer-lasting control than what a sprayed leaf treatment typically achieves. That persistence is the key advantage beyond simply reducing drift, because it reduces the need for frequent reapplications and can protect against pests that feed on or reside in the plant over time. The other statements aren’t as universally true: cost and maintenance needs can vary, and soil applications do not guarantee no impact on non-target organisms.