This 2010 photograph provided by Mississippi State University shows dead redbay trees along the Pascagoula River in Jackson County near Moss Point, Mississippi. The redbay ambrosia beetle is responsible for the death of one-third of the nation's redbay trees to date. Researchers from Mississippi and Florida say one female fungus-farming beetle inadvertently imported to Georgia may have been the source of the disease that has killed some 300 million redbay trees and threatens Florida's avocado groves. (John Riggins/Mississippi Agricultural and Forestry Experiment Station via AP)
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