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This Aug. 1, 2017 photo shows Llewellyn Everage, who directs interns and volunteers at the Audubon Louisiana Nature Center, holds an uprooted stem from a Chinese tallow, a highly invasive tree rapidly overtaking forests from Texas to Florida, at the nature center in New Orleans, Tuesday, Aug. 1, 2017. No portion of the tallow root can be left behind or a new tree can sprout. The 86-acre site, with walking trails and boardwalks winding through a swampy forest, flooded in 2005 and became overrun with Chinese tallow in the years that followed. (AP Photo/Stacey Plaisance)

This Aug. 1, 2017 photo shows Llewellyn Everage, who directs interns and volunteers at the Audubon Louisiana Nature Center, holds an uprooted stem from a Chinese tallow, a highly invasive tree rapidly overtaking forests from Texas to Florida, at the nature center in New Orleans, Tuesday, Aug. 1, 2017. No portion of the tallow root can be left behind or a new tree can sprout. The 86-acre site, with walking trails and boardwalks winding through a swampy forest, flooded in 2005 and became overrun with Chinese tallow in the years that followed. (AP Photo/Stacey Plaisance)