A Special Resource describes the social values of a hemlock forest. It's intended to raise landowner awareness and commitment to a management plan. Hemlock Ecosystem Restoration Practices describes ways to restore function and value to declining hemlock ecosystems. Although the use of chemical insecticides is often limited to ornamental settings, it remains the most effective way to protect hemlock trees. Insecticidal soaps and horticultural oils are effective and remain the most commonly used materials.
Hemlocks can remain in good condition if treatment begins early in the infestation process.
Many applicators are treating trees twice a year in the early spring and early fall. Systemic insecticides, such as Imidacloprid, are a newer alternative. These systemics cost more to use and their labels may restrict more locations where they can be applied but preliminary results indicate that protection may last up to two years. The University of Tennessee Tree Improvement Program has formed a group of cooperators including states and federal land managers throughout the eastern seaboard to collect hemlock seed for genetic conservation. This seed will be a source for outplantings that can be easily protected and used as a future breeding population.