01775nas a2200133   4500008004100000245009400041210006900135300001600204490000700220520127400227100001901501700001501520856010601535       1979                        eng d00aPhytophthora cinnamomi in Hawaiian forest soils: seasonal variations in population levels0 aPhytophthora cinnamomi in Hawaiian forest soils seasonal variati  a1268–12720 v693 a<p>Soils from three ohia forest sites with trees showing varying degrees of decline, and from adjacent healthy and declining sites, were sampled biweekly for population levels of <em>Phytophthora cinnamomi</em> over an 8- to 13-mo period. Population levels varied considerably among sites and within the same site throughout the course of the study. At the three sites, the fungus generally was undetectable or its population levels were lowest in the winter months when minimum soil temperatures were near 10 C and then they increased as soil temperatures increased. Population levels decreased after extended periods of heavy rain and measurements at six of the eight monthly sampling times were significantly higher at the decline site than at the adjacent healthy site. Significant correlations between <em>P. cinnamomi</em> population levels and maximum soil temperature, minimum soil temperature, and rainfall were found at some sites but not at others. Soil matric potentials at all sites ranged from 0 to –30 mb and were seldom less than –25 mb. High water holding capacity of the soils combined with rainfall averages ranging 2,984–3,489 mm/yr apparently were favorable for sporangium formation. Zoospores were prevalent at certain times of the year.</p>1 aKliejunas, J T1 aNagata, JT  uhttp://www.apsnet.org/publications/phytopathology/backissues/Documents/1979Abstracts/Phyto69_1268.htm01518nas a2200169   4500008004100000022001300041245006200054210005900116300001400175490000700189520097600196653001501172653002901187100001901216700001501235856009801250       1981                        eng d  a0191291700aPhytophthora root rot of Port-Orford-cedar in California.0 aPhytophthora root rot of PortOrfordcedar in California  a446–4470 v653 a<p><em>Phytophthora</em> Root Rot of {Port-Orford-Cedar} in California. John T. Kliejunas, Plant Pathologist, Forest Pest Management, Forest Service, {U.S.} Department of Agriculture, San Francisco, {CA} 94111. David H. Adams, Forest Pathologist, Department of Forestry, State of California, Sacramento 95814. Plant Dis. 65:446-447. . This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1981. {DOI:} {10.1094/PD-65-446.} The {Port-Orford-cedar} stands on federal, state, and private lands in northern California were surveyed in the spring of 1980 for <em>Phytophthora</em> root rot caused by <em>Phytophthora lateralis</em>. The disease was present at six sites on the Gasquet Ranger District, Six Rivers National Forest, and Jedediah Smith Redwoods State Park, Del Norte County, and on six ornamental cedars at a residence in Eureka, Humboldt County.</p>10aCalifornia10aChamaecyparis lawsoniana1 aKliejunas, J T1 aAdams, D H  uhttps://forestphytophthoras.org/references/phytophthora-root-rot-port-orford-cedar-california