Tree improvement in the Pacific Northwest

Advanced generation tree breeding programs are underway for Douglas-fir and coastal western hemlock. These programs will continue to improve rates and other traits. Regardless of whether seed is from a seed orchard or natural collection, it must be used in its appropriate breeding zone or seed zone. These zones vary by species. Breeding programs are underway for other species as well, with many of these programs emphasizing disease and insect resistance. Absolute gains at rotation are still unknown, but absolute (not percentage) gains observed early in the rotation should increase to some degree with time.