This undated photo provided by the Mississippi Entomological Museum shows the tiny redbay ambrosia beetle, which was first found in the U.S. in 2002. It carries a fungus that is devastating to any tree or shrub species in the laurel family. 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. (Joe A. MacGown/Mississippi Entomological Museum via AP)
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