What is the key feature of systemic poisons?

Systemic poisons are characterized by their ability to be absorbed by plants and then distributed throughout their tissues, including the sap. This process allows the poison to affect not only the areas where it was applied but also to permeate the entire plant system, making it effective against pests that feed on various parts of the plant. When a pest ingests these systemic poisons while feeding on the plant, they get the toxic compound in a way that is often more effective than contact poisons that only work on pests that come into direct contact with the substance.

This systemic action enhances the control of pests because it provides a broader range of protection, as the poison targets the inside of the plant where pests may feed, rather than just remaining on the surface. Understanding this mechanism is crucial for effective pest management practices in horticulture.