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Potential introduction risk of Sirex noctilio at U.S. marine ports of entry.

Map of U.S. marine port locations scaled in size according to their total tonnage (U.S. short tons), for years 1997 to 2003, of high-risk commodities from countries where S. noctilio is currently known or believed to be established. The background is the distribution of susceptible forest (primarily Pinus species) in the conterminous United States, generated through spatial interpolation of Forest Inventory and Analysis Phase 2 plot data.