How is a systemic pesticide commonly administered?

A systemic pesticide is designed to be absorbed by the plant and distribute throughout its tissues to control pests that feed on or inhabit the plant. This absorption can occur through different means: it may enter through the leaves when applied as a spray, through the roots when applied to the soil, or it can be injected into the plant directly.

The systemic nature allows the pesticide to work internally against pests that are not killed by merely topical applications, making it effective against a wide range of insects and diseases that might affect the plant. This method of administration is advantageous because it provides a longer-lasting effect and can help protect the entire plant, not just the treated surface.

In contrast, other methods such as broadcast spraying or high-pressure nozzle spraying apply the pesticide externally and may not penetrate the plant effectively, often limiting their reach to surface pests. Similarly, direct soil applications are more likely to target soil-dwelling pests rather than providing systemic protection throughout the plant. The absorption methods unique to systemic pesticides are what make their application particularly effective for certain types of pest control.