What defines a "systemic pesticide"?

A systemic pesticide is defined by its ability to be absorbed by a plant and then distributed throughout its tissues. This characteristic allows the pesticide to provide protection not just at the point of application but throughout the entire plant. When a plant absorbs a systemic pesticide, it can persist in various parts, including leaves, stems, roots, and flowers, making it effective against pests that feed on those parts.

This mode of action is particularly valuable for managing pests that reside within the plant or on hard-to-reach areas that direct applications may not adequately cover. For instance, systemic pesticides can be highly effective against sap-sucking insects like aphids or certain types of beetles that may be feeding on the plant tissues.

The other definitions provided do not capture the essence of systemic pesticides. Pesticides that are simply sprayed on pests or act as repellents do not possess the ability to be absorbed and translocated within the plant. Additionally, not all systemic pesticides are restricted to affecting insects; some can target a variety of pests, including fungi and weeds, making the broader definition necessary for clarity.