The Hawaii Island Albizia Task Force announced it will carry out a series of albizia control projects costing $1 million within the next several weeks on the east side of the Big Island.
The task force — which includes representatives from the Big Island Invasive Species Committee, state Department of Transportation, Hawaii County Civil Defense, Hawaii Electric Light Co., U.S. Forest Service and other organizations — has four projects planned for East Hawaii.
Springer Kaye, manager at the Big Island Invasive Species Committee, said the first project is nearly complete. That project, which will cost more than $200,000, involves clearing all albizia within 100 meters of a 1-mile stretch of the Puainako Extension, where 17-year-old trees reaching more than 100 feet tall have caused significant traffic hazards.
The task force also has plans to clear albizia overhanging Hoolaulima Road near the Hilo landfill, as well as within a 2-mile stretch of Kekuanaoa Street where it accesses Hilo International Airport.
Finally, a 200-foot-tall albizia on Halai Street, which poses a significant danger to surrounding residences, will be removed.
The three upcoming projects will begin as arborists are available, Kaye said, and is expected take about four weeks to complete.
Kaye said arborists will trim back trees located closer to roads and other structures before treating their remains with herbicides to prevent the dying trees from collapsing onto roads or power lines. Trees farther away from structures will be treated with herbicides without needing to be cut down.
Additional albizia abatement projects, including clearing operations at Makuu Drive in Keaau and Kapoho Road in Pahoa, are planned to be completed this year as well, according to a 2017 impact report from the Big Island Invasive Species Committee. The report also said projects are scheduled for Kahakai Boulevard in Pahoa and Waianuenue Avenue in Hilo in 2019.
Kaye was gratified that residents are beginning to understand the hazards of the fast-growing trees.
“It’s taken awhile, but people really get now that these are invasive trees and we don’t want them, we want better trees,” Kaye said.
Albizia’s tendency to shed large branches in heavy rain poses a significant danger to nearby structures, people and roadways. After Tropical Storm Iselle struck the island in 2014, albizia limbs blocked roads throughout Puna and disabled power lines for days.
In addition, because albizia fixes nitrogen in the soil, the trees create a welcome environment for other invasive species which crowd out local plants that have evolved to thrive in Hawaii’s nitrogen-poor soil. The excess nitrogen also can accumulate in river gulches and contaminate runoff water.
“Our primary concern is safety,” said Bill Buckley, BIISC albizia project coordinator in a statement. “These are some of the most heavily used streets in East Hawaii, and falling trees and branches severely impact access and can potentially cause serious injury.”
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