What is a systemic pesticide?

• A. A pesticide that evaporates quickly
• B. A pesticide that is absorbed by plants and transported throughout their tissues
• C. A pesticide that must be applied frequently
• D. A pesticide that is applied to plant surfaces only

Answer: (B)

A systemic pesticide is one that is absorbed by plants and can be transported throughout their tissues. This characteristic allows it to affect not just the area where it was applied, but also other parts of the plant that may not have been directly treated. When systemic pesticides are utilized, they can provide prolonged protection against pests that feed on various parts of the plant, including roots, stems, and leaves. This is particularly advantageous for controlling pests that may be hidden from contact with other types of pesticides or those that feed on the interior parts of the plant.

In contrast, pesticides that evaporate quickly do not have the same mechanism of action as systemic pesticides because they tend to dissipate into the atmosphere rather than being absorbed by the plant. Pesticides that must be applied frequently usually indicate a need for short-term effectiveness and do not possess the long-lasting capabilities that systemic options offer. Additionally, pesticides applied only to the surface of plants are referred to as foliar applications; these are not absorbed by the plant and therefore do not exhibit the systemic action that characterizes systemic pesticides. Understanding these distinctions is important in selecting the right pesticide for effective pest management strategies.