What does the term "systemic insecticide" refer to?

• A. An insecticide that only targets specific areas
• B. An insecticide absorbed by plants, affecting insects that feed on them
• C. An insecticide that has no effect on the environment
• D. An insecticide that only works above ground

Answer: (B)

The term "systemic insecticide" refers to an insecticide that is absorbed by plants and affects insects that feed on them. This mode of action is significant because, once absorbed, the insecticide is distributed throughout the plant’s tissues, including leaves, stems, and roots. As a result, when insects consume any part of the plant, they are exposed to the insecticide, leading to effective pest control.

Systemic insecticides are particularly beneficial for managing pests that are difficult to target directly with sprays, as they work internally and can provide longer-lasting protection. This quality also allows them to control a range of pests that feed on the treated plants, even those that are hidden or sheltered from direct contact with traditional surface sprays.

Understanding this property is vital for anyone involved in pest management, as it helps in selecting the appropriate product for specific situations and understanding the impact on pest biology and behavior.