Rhabdocline parkeri, a ubiquitous foliar endophyte of Douglas-fir

1986 ◽  
Vol 64 (9) ◽  
pp. 1849-1855 ◽  
Author(s):  
Martha Sherwood-Pike ◽  
Jeffrey K. Stone ◽  
George C. Carroll
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Extensive Survey

Rhabdocline parkeri n. sp. (Hemiphacideaceae) is described, together with its sporodochial anamorph, Meria parkeri n. sp. Rhabdocline parkeri occurs as localized endophytic infections of living Douglas-fir needles, fruiting primarily on senescent, galled, or dead needles. It is ubiquitous in western Oregon, occurring on essentially all trees sampled in an extensive survey of Douglas-fir needle endophytes, and has been recorded from Washington and northern California.

scholarly journals Douglas-fir encroachment reduces drought resistance in Oregon white oak of northern California

2021 ◽  
Vol 498 ◽  
pp. 119543
Author(s):  
Jill J. Beckmann ◽  
Rosemary L. Sherriff ◽  
Lucy P. Kerhoulas ◽  
Jeffrey M. Kane
Keyword(s):  
Drought Resistance ◽  
Douglas Fir ◽  
Northern California ◽  
White Oak ◽  
Oregon White Oak

Suppressed crown expansion and increased bud density after precommercial thinning in California Douglas-fir

1983 ◽  
Vol 13 (6) ◽  
pp. 1246-1248 ◽  
Author(s):  
Douglas A. Maguire
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Precommercial Thinning

A densely regenerated Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) plantation in northern California was precommercially thinned from approximately 15 000 stems/ha to 740 stems/ha. Trees in an unthinned strip served as control for analyzing thinning responses. The terminal and lateral leader growth of "released" trees were significantly reduced after thinning, but the number of buds was significantly increased.

Trunk-Implanted Acephate to Protect Douglas-Fir Seed Crops on Individual Trees in Northern California

1988 ◽  
Vol 81 (6) ◽  
pp. 1668-1671 ◽  
Author(s):  
John D. Stein ◽  
Thomas W. Koerber ◽  
Charles L. Frank
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Seed Crops ◽  
Individual Trees

TIMEMA DOUGLASI (PHASMATOPTERA: TIMEMATODEA), ANEW PARTHENOGENETIC SPECIES FROM SOUTHWESTERN OREGON AND NORTHERN CALIFORNIA, WITH NOTES ON OTHER SPECIES

1996 ◽  
Vol 128 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Cristina P. Sandoval ◽  
Vernon R. Vickery
Keyword(s):  
Douglas Fir ◽  
Northern California ◽  
Old Growth ◽  
Parthenogenetic Species ◽  
The Third

AbstractTimema douglasi sp.nov. is described from southwestern Oregon and northern California, USA. It is the third parthenogenetic species in the genus and is a specialist feeder on old-growth Douglas fir, occasionally causing serious defoliation. Timema knulli Strohecker is synonymized with Timema californicum Scudder.

Restoration thinning enhances growth and diversity in mixed redwood/Douglas-fir stands in northern California, U.S.A.

2018 ◽  
Vol 26 (6) ◽  
pp. 1170-1179 ◽  
Author(s):  
Christa M. Dagley ◽  
John-Pascal Berrill ◽  
Lathrop P. Leonard ◽  
Yoon G. Kim
Keyword(s):  
Douglas Fir ◽  
Northern California

A Generalized Height-Diameter Equation for Coastal California Species

1988 ◽  
Vol 3 (4) ◽  
pp. 113-115 ◽  
Author(s):  
Bruce E. Krumland ◽  
Lee C. Wensel
Keyword(s):  
Pseudotsuga Menziesii ◽  
Site Index ◽  
Douglas Fir ◽  
Sequoia Sempervirens ◽  
Small Samples ◽  
Diameter Distribution ◽  
Northern California ◽  
Local Volume ◽  
Total Height ◽  
Volume Table

Abstract The equation H = Hm exp [-b(D-c - Dm-c)] is proposed for estimating the total height of trees on growth and inventory plots. This estimator requires only the computation of average dbh (Dm) and average total height (Hm) of a sample of trees selected from the upper one-fifth of the stand diameter distribution. The procedure is also efficient because this stand component is also used to estimate site index. With small samples, these equations were found to be accurate in local volume table construction. Results are illustrated using redwood (Sequoia sempervirens) and Douglas-fir (Pseudotsuga menziesii) data from northern California. West. J. Appl. For. 3(4):113-115, October 1988.

Potential for Using Borates to Mitigate the Risk of Phytophthora ramorum Spread on Douglas-Fir Logs

2018 ◽  
Vol 68 (1) ◽  
pp. 64-66
Author(s):  
Jed Cappellazzi ◽  
Jeffrey J. Morrell
Keyword(s):  
Tree Species ◽  
Douglas Fir ◽  
Phytophthora Ramorum ◽  
Northern California ◽  
Wide Range ◽  
Glycol Solution

Abstract Phytophthora ramorum is an increasingly important tree pathogen in northern California and southern Oregon. While it has the greatest effect on tanoak, it can infect a wide range of tree species, including Douglas-fir. Oregon has instituted a quarantine area to slow the spread of this pathogen, and there are concerns that further restrictions may be imposed on log movement, including those of Douglas-fir. The potential for using boron as a log treatment to limit P. ramorum was evaluated. While boron either alone or in a glycol solution was capable of moving into the bark, there was no evidence that it could move further into the sapwood. The results suggest that bark removal would be necessary for the use of boron as a mitigation agent for the spread of P. ramorum.

scholarly journals Deterioration of Fire-Killed Timber in Southern Oregon and Northern California

1996 ◽  
Vol 11 (4) ◽  
pp. 125-131 ◽  
Author(s):  
Eini C. Lowell ◽  
James M. Cahill
Keyword(s):  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Douglas Fir ◽  
Northern California ◽  
Percent Loss ◽  
White Fir ◽  
Wide Range ◽  
Sugar Pine ◽  
Second Year ◽  
One Year

Abstract Deterioration of fire-killed timber in the coastal mountains of southern Oregon and northern California was monitored over a 3 yr period (1988-1990). Defect was identified and measured on felled and bucked sample trees by using Scribner and cubic scaling rules. Douglas-fir (Pseudotsuga menziesii), grand fir (Abies grandis), white fir (A. concolor),ponderosa pine (Pinus ponderosa), and sugar pine (Pinus lambertiana), covering a wide range of geographic areas, site conditions, and tree size and age, were studied. One year after death, Douglas-fir, sugar pine, and ponderosa pine had lost about 1% and the true firs 5% of their cubic volume. The sapwood of the pines was heavily stained. The occurrence of sap rot and weather checks increased the second year. Percent loss in all species was correlated with small-end scaling diameter. A logistic regression model predicting the incidence of cull was developed for use on logs that have been dead for 3 yr. West. J. Appl. For. 11(4):125-131.

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