Koa wilt there are no local hosts, it is suggested that one plant seeds from several different sources in the hope of finding a resistant tree. Currently, research about Koa wilt is focused primarily on determining resistant Koa varieties. Koa is a commodity, a dominant native forest species, and an important element of Hawaiian culture. Koa is highly prized hardwood that can sell for prices as high as $150 a board foot, a special measurement indicating one-foot by one-foot by one-inch wood piece. Koa is currently being grown on plantations to support this high demand, yet some plantations have a 90% tree
Hawaiian tropical rainforests milo ("Thespesia populnea") for the past 1,000–2,000 years. The Polynesian-introduced noni ("Morinda citrifolia"), pia ("Tacca leontopetaloides"), and kī ("Cordyline fruticosa") are also common in this zone. Other native species include pololei ("Ophioglossum concinnum"), ākia ("Wikstroemia" spp.), loulu fan palms ("Pritchardia" spp.), ōhia lehua ("Metrosideros polymorpha"), and lama ("Diospyros sandwicensis"). Mixed mesic forests, at on the windward slopes of the large islands in addition to the summit of Mount Lānaihale on Lānai, receive of rainfall annually and thus may not be true rainforests. The forest canopy, dominated by koa ("Acacia koa") and ōhia lehua ("Metrosideros polymorpha"), is somewhat open, but tree