Soil Injections - Soil injections similar to sprays require 7 - 30 times the amount of pesticide active ingredient than stem injections, and as much as 4000 times the amount of contaminated volume applied to the soil. In addition, soil applications work slower and typically provide a lower level of control. Finally, due to environmental risks, soil applications are limited to where they can be applied and how much can be applied in an area.
Cambial injections - Cambial injections are placed just under the bark. There are several issues with the placement of these products. First, the cambium is not the transportive tissue that brings nutrient and water throughout the tree. Additionally, it is a particularly sensitive area which we consider the embryo of the tree, where bark grows on one side and sapwood grows on the other. Finally, because of these issues, only very small doses can be applied. These small doses have been proven to lack the acheived with the Arborjet system. Sometime these products leak out and never reach the transport tissues of the tree. See video of pesticide leaking from cambium.