Spider mites feed on the foliage of plants by breaking open the upper cell layers and sucking the sap. Populations develop rapidly in drier conditions and stressed plants are particularly vulnerable. Symptoms include discolored (bronze to black) and permanently weakened foliage and premature defoliation. Severity of spider mite outbreaks depend largely on the weather and the ability of natural predators to keep mite populations in check. Treatment options include spraying, soil injections and trunk injections.
PHOTO (middle) accredited to: P. Kapitola, State Phytosanitary Admin., www.Bugwood.org
PHOTO (right) accredited to: W. Strong, BC Ministry of Forests, www.Bugwood.org