Ohia trees are a native Hawaiian tree species being killed off by a fungal disease, and this bill directs several federal agencies — including land and wildlife agencies and forest researchers — to work with the state of Hawaii to fight it. It sets up ongoing research into how the disease spreads, funds efforts to control wild animals like deer that can help spread it (only on private land if the landowner agrees), and provides money and staff to help prevent the disease from spreading further and to replant native forests. In practice, this mainly affects Hawaii's land managers, researchers, and landowners near affected forests, along with the federal scientists and agencies tasked with carrying out the work.