What does it mean when a pesticide is described as systemic?

When a pesticide is described as systemic, it means that it is absorbed by a plant and circulates throughout its tissues. This characteristic allows the pesticide to move within the plant, making it effective against pests that feed on the plant, including those that might be hidden from direct contact with the pesticide. Systemic pesticides can provide longer-lasting protection as they are taken up by the plant and can remain effective for an extended period as the plant grows and continues to protect itself internally.

This is essential for controlling pests that may be difficult to manage with surface treatments alone, as systemic pesticides can reach areas where pests might be residing within the plant, such as in the leaves, stems, or roots. In contrast, options relating to effectiveness on certain insects or targeting only surface pests would not capture the broad capability of systemic pesticides. Similarly, an emphasis on quick action does not define a systemic pesticide, as some may take time to reach effective concentrations within the plant.