Insecticides can be applied in a number of ways including foliar spray, systemic bark spray, soil application, and tree injection. If you need immediate control and have the capability of spray applications, there are many tools available. Many of these treatments work on contact making them ‘knockdown’ treatments. Certain treatments, like Transtect, can be applied by systemic bark spray.
Systemic treatments have evolved to combat many pests that were traditionally difficult to control or managed only by spraying. Uptake and distribution of chemicals is reliant upon the tree’s vascular system. Within the vascular system, water and nutrients are absorbed through the roots and transported up to the foliage by the process known as transpiration. Plant healthcare professionals can take advantage of this upward pull to apply treatments to a small portion of the tree and have that treatment move internally to other parts of the tree.