What is a characteristic of systems used for tree injection?

Tree injection systems are designed to deliver pesticides directly into the active xylem, which is essential for ensuring that the chemicals reach the vascular system of the tree effectively. This method allows for targeted treatment of specific trees, minimizing the spread of pesticides into the surrounding environment and reducing the potential for affecting non-target organisms.

By utilizing the xylem, which is responsible for transporting water and nutrients, tree injection allows the pesticide to be absorbed and distributed throughout the tree's tissues. This targeted approach often results in more effective pest control and reduces the risk of chemical runoff or drift that can occur with other application methods.

Other options do not align with the fundamental principles of tree injection. Soil penetration refers to methods that involve applying pesticides to the soil, which is not part of the tree injection process. Broadcasting involves applying pesticides over a larger area, often from above, which contrasts with the focused method of injection. Lastly, reliance on foliage absorption describes a different approach where pesticides are applied to leaves rather than being introduced directly into the tree trunk.