|Statement||K.L. Kavanagh, G.M. Filip, and W. Rogers.|
|Series||The Woodland workbook, EC -- 1515., Extension circular (Oregon State University. Extension Service) -- 1515.|
|Contributions||Filip, Gregory M., Rogers, William Reinhold., Oregon State University. Extension Service.|
|The Physical Object|
|Pagination||7 p. :|
Management guidance in this book complements Field Guide to the Common Diseases and Insect Pests of Oregon and Washington Conifers (Goheen, E.M., and te, , USDA Forest Service), which is an identification guide.1 Throughout this publication, we refer to specific pages in Goheen & Willhite for help in. Cast disease in coastal Oregon Needle Retention Estimates of the southern Oregon Coast and southwest Washington this forest disease is causing the largest conifer foliage disease epidemic in ameliorate disease problems in the Coast Range of Oregon and Washington. (3) Understand the growth, structure, and morphology of Douglas-fir trees. plants along the Oregon coast. Sitka spruce is able to withstand salt winds and harsh conditions along the central Oregon coast better than other associated conifers, such as western hemlock and shore pine. Sitka spruce normally grows in mixed stands, but because of its high tolerance of salt, it can be found in pure stands in tidewater Size: 2MB. Two new foliage diseases of Douglas fir and several other conifer species are emerging in Oregon, and they could be a threat to conifer growers and nurseries. The pathogens include Phytophthora pluvialis, the cause of Pytophthora needle cast, and Rhizoctonia butinii, causing web blight of foliage on Douglas fir and several other conifers (Abies, Tsuga).
Additional Physical Format: Online version: Bega, Robert V., Diseases of Pacific Coast conifers. [Washington]: Dept. of Agriculture, Forest Service: For sale. Native tree diseases are a particularly common menace to Oregon’s western forests. Among the most prevalent diseases in Oregon are Swiss needle cast and laminated root rot. Swiss needle cast is a foliage disease that affects Douglas-fir trees. It causes trees to prematurely shed their needles. Unlike most conifers, larches are deciduous, dropping their needles in the fall. The needles grow in bundles like the pines, but they have many more needles per bundle, and each bundle grows on a distinctive little spur twig. Two species of larch grow in the Northwest: Western Larch (Larix occidentalis) - Grows on the east side of the Cascades. Oregon, USA along the Paciﬁc coast and west slope of the Oregon Coast Range—referred to hereafter as the epidemic area (Shaw et al. ). The disease is most severe near the coast and at low elevations. The severity of Swiss needle cast has been linked to warm winter temperature and consistent spring/summer leaf wetness (Hansen.
Black et al. Swiss needle cast 3 25 1. Introduction 26 Over the past twenty years, an epidemic of Swiss needle cast, a foliage disease 27 caused by the fungus Phaeocryptopus gaeumannii, has emerged in the Oregon Coast 28 Range, significantly lowering productivity in affected Douglas-fir forests (Hansen et al., 29 ; Maguire et al., ).). Fruiting bodies of the fungal pathogen interfere with. Conifer Foliage Diseases Needle Casts Hosts: Conifers. Diagnosis and Damage: Identification of needle cast diseases is based on the appearance of fruiting bodies on discolored needles and premature death and shedding of needles. Identification is difficult without looking at fruiting bodies and spore shape and size with a compound microscope. In a healthy needle, the stomata will appear white in color (Photos ). Photo 3. Interior needles turning color due to needlecast disease on spruce. Photo 4. The needle on the right the shows the healthy needle (white stomata). The needle on the left is infected with Swiss needlecast and shows the black fruiting bodies emerging from the stomata. Plant Disease / July Incidence and Impact of Swiss Needle Cast in Forest Plantations of Douglas-fir in Coastal Oregon E. M. Hansen, J. K. Stone, B. R. Capitano, P. Rosso, W. Sutton, and L. Winton, Department of Botany and.