In spruce plantings, infestations can persist for years resulting in reduced tree vigor and eventually death. Recently planted trees, nursery seedlings, or trees under stress are especially susceptible to serious injury. To check for mite infestations, vigorously shake a branch over a piece of white paper, then rub your hand across the paper or press the paper in half. If red smears appear, mites are probably present. Trees should be checked regularly since mite populations can increase rapidly.
Heavy rain accompanied by high winds and extreme temperatures are means of natural control.
Some control can be achieved by washing infested trees with a strong jet of water. Insecticides must be applied at high pressure so the spray penetrates the inner branches and webbing. A second application may be required two weeks after the initial spray.