Observations on the Decline and Death of Southern Magnolia
Abstract: A decline and death of southern magnolia in urban areas of the South was observed from 1976 to 1985. Defoliation, dieback, discoloration of stem wood, and root necrosis occurred 1-2 years before death. The xylem temperature was higher and xylem moisture content lower in declining trees than in healthy trees. The nature of the causal agent(s) was not established. A variety of treatments was applied to affected trees in an attempt to arrest symptom development. Some diseased trees injected with Oxytetracycline HCL have survived while trees receiving other chemical or cultural treatments did not survive.