Which of the following statements correctly describes systemic insecticides?

Which of the following statements correctly describes systemic insecticides?

• A. They work only on contact
• B. They target only soil pests
• C. They are absorbed by plants to control feeding pests
• D. They require more frequent application

Answer: (C)

Systemic insecticides are specifically formulated to be absorbed by plants, which allows them to control pests that feed on the plant tissue. When a plant takes up these insecticides through its roots or leaves, the active ingredient becomes distributed throughout the plant. Consequently, when pests feed on the plant, they ingest the insecticide, which interferes with their biological functions, ultimately leading to pest mortality. This mode of action is distinct from contact insecticides, which must come into direct contact with a pest to be effective, and different from insecticides that only target soil pests, as systemic insecticides can affect a range of pests, including those that feed on foliage. Moreover, systemic insecticides typically require less frequent application than contact types, as the insecticide remains effective in the plant over an extended period, protecting it from pests for longer durations.

Systemic insecticides are specifically formulated to be absorbed by plants, which allows them to control pests that feed on the plant tissue. When a plant takes up these insecticides through its roots or leaves, the active ingredient becomes distributed throughout the plant. Consequently, when pests feed on the plant, they ingest the insecticide, which interferes with their biological functions, ultimately leading to pest mortality.

This mode of action is distinct from contact insecticides, which must come into direct contact with a pest to be effective, and different from insecticides that only target soil pests, as systemic insecticides can affect a range of pests, including those that feed on foliage. Moreover, systemic insecticides typically require less frequent application than contact types, as the insecticide remains effective in the plant over an extended period, protecting it from pests for longer durations.