Final answer:
A systemic insecticide is a pesticide that is absorbed and transported throughout a plant, protecting it from insects. The active ingredient is taken up by the roots and distributed throughout the plant's tissues, providing long-lasting protection. Examples include imidacloprid.
Step-by-step explanation:
A systemic insecticide is a type of pesticide that is absorbed and transported throughout the plant, protecting it from insects that feed on various parts of the plant. When a plant is treated with a systemic insecticide, the active ingredient is taken up by the roots and then moves through the plant's vascular system, reaching all parts of the plant, including leaves, stems, flowers, and roots. This provides long-lasting protection against pests that may not be directly exposed to the insecticide. For example, imidacloprid is a popular systemic insecticide used in agriculture and horticulture. When applied to the soil or injected into tree trunks, imidacloprid is taken up by the plant and distributed throughout its tissues. As a result, it can protect the plant from insect infestations for an extended period of time. Systemic insecticides are advantageous as they provide continuous protection against pests and are less affected by rain or irrigation. However, it is important to use them judiciously and follow label instructions to minimize any potential harms to non-target organisms and the environment.