. Elytroderma disease of ponderosa pine in the Pacific Northwest. Ponderosa pine Diseases and pests Northwest, Pacific; Elytroderma deformans. Introduction The disease caused by Ely troderma deformans (Weir) Darker1 has been conspicuous during recent years in many ponderosa pine (Pinus ponderosa Laws.) stands from south- ern British Columbia to northeastern California and western Montana. Although less destructive than its alarming appearance often suggests, it has reduced growth rates on more than 100,000 acres in Oregon and Washing- ton and has killed many trees on a few areas of severe infe
. Elytroderma disease of ponderosa pine in the Pacific Northwest. Ponderosa pine Diseases and pests Northwest, Pacific; Elytroderma deformans. Introduction The disease caused by Ely troderma deformans (Weir) Darker1 has been conspicuous during recent years in many ponderosa pine (Pinus ponderosa Laws.) stands from south- ern British Columbia to northeastern California and western Montana. Although less destructive than its alarming appearance often suggests, it has reduced growth rates on more than 100,000 acres in Oregon and Washing- ton and has killed many trees on a few areas of severe infestation, sometimes more than 1,000 acres in extent. Heaviest damage has occurred in central and northeastern Oregon. This paper is concerned with the disease only on ponderosa pine and principally with its behavior and effects east of the Cascade Range in Oregon and Washington. It is generally less damaging in other regions and to other hosts. 1 Originally described by Weir (1916) as Hypoderma deformans. It is commonly called needle blight or needle cast, but "Elytroderma disease" seems preferable since it also invades and damages twigs, branches, and young Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Childs, T. W. (Thomas White), 1908-. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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