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Journal articles on the topic 'Douglas (Pseudotsuga menziesii Mirb. Franco)'

Author: Grafiati

Published: 6 July 2024

Last updated: 31 July 2025

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1

Funk, A., T. A. D. Woods, and Sarah J. Hopkinson. "Hormonema merioides n.sp., on Douglas-fir needles." Canadian Journal of Botany 63, no. 9 (1985): 1579–81. http://dx.doi.org/10.1139/b85-219.

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2

de Kort, Ingrid. "Relationships Between Sapwood Amount, Latewood Percentage, Moisture Content and Crown Vitality of Douglas Fir, Pseudotsuga Menziesii." IAWA Journal 14, no. 4 (1993): 413–27. http://dx.doi.org/10.1163/22941932-90000596.

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Relationships between sapwood amount, latewood percentage, moisture content and crown vitality were studied in 171 Douglas firs [Pseudotsuga menziesii (Mirb.) Franco] belonging to different vitality classes. The trees originated from 10 stands in the Netherlands varying in age from 25-70 years.

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3

Marshall, Valin G., and Hugh J. Barclay. "Response of young Douglas-fir to urea fertilizer applied on and off snow." Forestry Chronicle 70, no. 3 (1994): 294–98. http://dx.doi.org/10.5558/tfc70294-3.

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The effects of 200 kg N ha−1 applied as urea fertilizer on 50 cm of snow or on bare ground were studied in an 11-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation on Vancouver Island. Analysis was done on all trees per plot and on 20 selected dominant trees per plot. Up to 2 years after fertilization, urea significantly increased absolute DBH increments over controls in all trees and the 20 selected trees per plot; response to fertilization on snow was equal to that on bare ground. Between the 3rd and 9th year following fertilization, mean DBH increments were not significa

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4

Hart, V., M. Nentvichová-Hartová, and P. Tauchman. "Analysis of herbicide effects on Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration." Journal of Forest Science 56, No. 5 (2010): 209–17. http://dx.doi.org/10.17221/77/2009-jfs.

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Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration under parent stand after weed suppression was investigated in the area of the Training Forest Enterprise in Kostelec nad Čern&yacute;mi lesy. The study evaluates two measurements made in a two-year interval. The parent stand, where Douglas fir grows in mixture with our domestic tree species, is one of the oldest and most productive stands at the Training Forest Enterprise in Kostelec nad Čern&yacute;mi lesy. Herbicides for the control of weeds were applied onto three permanent experimental plots under the parent st

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5

Mondek, Jan, and Martin Baláš. "Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and its role in the Czech forests." Journal of Forest Science 65, No. 2 (2019): 41–50. http://dx.doi.org/10.17221/9/2019-jfs.

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The presented study summarizes the results concerning the effects of cultivation of Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) in the Czech Republic. It focuses on more recent results, published especially in the last decades, it includes also older relevant data. It describes the intensity of production as well as non-production forest functions in the conditions of the Czech Republic. It analyses the research results concerning the volume and value production in comparison with native tree species, also documents effects on soil and herb vegetation diversity in forest ecosystems, an

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6

Kaundun, Shiv Shankhar, Philippe Lebreton, and Alain Bailly. "Needle flavonoid variation in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii) populations." Canadian Journal of Botany 76, no. 12 (1998): 2076–83. http://dx.doi.org/10.1139/b98-187.

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The variability of six Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) populations was studied with the help of needle flavonoids. Of the two proanthocyanidins and six flavonols detected and measured by high performance liquid chromatography, myricetin and prodelphinidin allowed partial separation of the sampled coastal Douglas-fir populations into three geographical groups. Even though conspicuous differences were found between the northernmost and southernmost provenances, flavonoid markers were insufficient to identify the origin of a coastal Douglas-fir population without

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7

Alfaro, René I., and Roy F. Shepherd. "Tree-Ring Growth of Interior Douglas-Fir After One Year's Defoliation by Douglas-Fir Tussock Moth." Forest Science 37, no. 3 (1991): 959–64. http://dx.doi.org/10.1093/forestscience/37.3.959.

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Abstract Reductions in ring width of Douglas-fir, Pseudotsuga menziesii [Mirb.] Franco, trees defoliated for 1 year by the Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), are reported. Trees were treated with a nuclear polyhedrosis virus, but the resultant epizootic which killed larvae and reduced defoliation took several weeks to develop and trees sustained varying degrees of damage. No negative effects of defoliation were noted in the year when feeding took place; on the contrary, a growth stimulation occurred. Defoliation levels above 50% resulted in growth reduction for 2 year

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8

Mauer, O., and E. Palátová. " Root system development in Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) on fertile sites." Journal of Forest Science 58, No. 9 (2012): 400–409. http://dx.doi.org/10.17221/94/2011-jfs.

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The paper analyses the root system development in the artificially established stands of Douglas fir aged 10, 20, 30, 60 and 80 years on aerated soils (Cambisols) without skeleton. On these sites, the Douglas fir develops a uniform root system of substitute taproots and anchors, which has great predispositions to assure the good mechanical stability of trees as well as its resistance to sudden changes in upper soil horizons. Several anchors growing in positive geotropic direction shoot from the stem base, several slant anchors shooting from the side of the stem base turn into the positive geot

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9

Kostic, Olga, Miroslava Mitrovic, and Pavle Pavlovic. "Douglas fir impact on the dynamics and composition of humus in the soil of indigenous beech forest in western Serbia." Zbornik Matice srpske za prirodne nauke, no. 138 (2020): 83–95. http://dx.doi.org/10.2298/zmspn2038083k.

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This study investigates the impact of organic matter from Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) on the amount and composition of humus in acid brown soil in a climatoregional beech forest (Fagetum moesiacae montanum B. Jov. 1967 s.l.) on Mt. Maljen. To accomplish this objective, we performed a one-year litterbag decomposition experiment with litterfall from Fagus moesiaca and Pseudotsuga menziesii. The quantitative and qualitative content of humus and the intensity of the decomposition process of organic mat?ter from beech and Douglas fir were analysed. Less humus was found during

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10

Sychra, D., and O. Mauer. "Prosperity of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) plantations in relation to the shelter." Journal of Forest Science 59, No. 9 (2013): 352–58. http://dx.doi.org/10.17221/84/2012-jfs.

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The study evaluates the mortality, growth and qualitative characteristics of Douglas fir transplants planted out on clear-cut areas with different shelter. We assessed 11 clearings situated in the Forest Site Complex 4K &ndash; acidic beech (Fagetum acidophilum). The young trees were assessed 3 years after planting for the following parameters: total shoot length, increment, root collar diameter, number of multiple stems, stem curvature, crown form, length of needles, colour of needles and frost damage. The lowest mortality and the best growth of Douglas fir plants were recorded in small,

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11

Pulkrab, K., M. Sloup, and M. Zeman. "Economic Impact of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) production in the Czech Republic." Journal of Forest Science 60, No. 7 (2014): 297–306. http://dx.doi.org/10.17221/27/2014-jfs.

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The article addresses the issues of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) production in the Czech Republic (CR). Our analysis shows that the tree species can occupy 149,616&ndash;163,713 ha in the CR (with respect to ecological limits set by the Czech legislation). The potential economic effect expressed by the gross yield of forest production might be higher by 27&ndash;30 million EUR&middot;yr<sup>&ndash;1</sup>.&nbsp; The results of the analysis support the forest owners&rsquo; interest to extend Douglas-fir production in the CR, similarly li

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12

Cruz-Nicolás, Jorge, J. Jesús Vargas-Hernández, Porfirio Ramírez-Vallejo, and Javier López-Upton. "GENETIC DIVERSITY AND DIFFERENTIATION OF Pseudotsuga menziesii (Mirb.) Franco POPULATIONS IN MÉXICO." Revista Fitotecnia Mexicana 34, no. 4 (2011): 233. http://dx.doi.org/10.35196/rfm.2011.4.233.

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Mexican populations of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] constitute valuable gene pools for conservation and breeding programs of this species. Genetic diversity and population divergence were estimated using 18 isozyme loci and samples from 11 natural Douglas-fir populations in México. Genetic diversity was high at the species level (83.3 % polymorphic loci and 2.9 alleles per locus), but low at the population level (28.3 % polymorphic loci and 1.52 alleles per locus), particularly for populations from central México. A high level of population differentiation was found (Fst

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13

Anastasijevic, Nebojsa, Mirjana Ocokoljic, and Vesna Vratusa. "Properties and variability of douglas-fir seedlings -Pseudotsuga menziesii (Mirb.) Franco-." Genetika 37, no. 2 (2005): 113–19. http://dx.doi.org/10.2298/gensr0502113a.

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Based on the comparative morphophysiological analysis of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings, three half-sib lines from Quercetum farneto-cerris s.l. site, and three half-sib lines from Saliceto-Populeturn s.l. site, the data on seedling characteristics and variability of this cultivated species are discussed. The paper also ascertains the variability of seedling properties that affect mother tree selection and production technology of plant material of desired characteristics for the application in forestry and landscape architecture and horticulture.

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14

Osman, Khalid A., and Steven H. Sharrow. "Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation." Forest Ecology and Management 60, no. 1-2 (1993): 105–17. http://dx.doi.org/10.1016/0378-1127(93)90025-i.

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15

Paweł, Jałoszyński. "Pierwsze stwierdzenie Eurytoma gatesi Delvare, 2014 w Polsce (Hymenoptera: Chalcidoidea, Eurytomidae)." Acta entomologica silesiana 26, online035 (2018): 1–3. https://doi.org/10.5281/zenodo.1420017.

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First record of <em>Eurytoma gatesi</em> Delvare, 2014 in Poland (Hymenoptera: Chalcidoidea, Eurytomidae). <em>Eurytoma gatesi</em> Delvare is recorded from Poland for the first time, based on specimens obtained by rearing from infested seeds of <em>Pseudotsuga menziesii</em> (Mirb.) Franco collected in the city of Poznań, Wielkopolsko-Kujawska Lowland. This species, described in 2014, is strictly associated with the Douglas fir and is most likely native of western North America; to date, it has been known from British Colombia, California, New Mexico and France.

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16

El-Kassaby, Yousry A., and Hugh J. Barclay. "Cost of reproduction in Douglas-fir." Canadian Journal of Botany 70, no. 7 (1992): 1429–32. http://dx.doi.org/10.1139/b92-179.

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The balance between allocating energy resources to reproduction or growth has considerable theoretical interest. Conflicting ecological requirements and evolutionary pressures often necessitate a trade-off in energy allocation. We obtained measurements on seed-cone production and annual ring width of 365 Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees from 29 open-pollinated families for 8 years. Phenotypic, genetic, and environmental correlations were computed for seed-cone production and ring width for each year. Five of the eight environmental correlations were negative (range −0.0

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17

Coops, Nicholas C., Robbie A. Hember, and Richard H. Waring. "Assessing the impact of current and projected climates on Douglas-Fir productivity in British Columbia, Canada, using a process-based model (3-PG)." Canadian Journal of Forest Research 40, no. 3 (2010): 511–24. http://dx.doi.org/10.1139/x09-201.

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Predicted climate change is expected to significantly affect tree growth in many areas. We used a process-based model (Physiological Principles for Predicting Growth, 3-PG) to evaluate how climatic variation might alter growth of Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco var. glauca (Beissn.) Franco and Pseudotsuga menziesii (Mirb.) Franco var. menziesii ) across biogeoclimatic zones in British Columbia. The results indicate that there will be significant changes in site index (defined as the height (in metres) of dominant trees at 50 years) over this century. In the interior, a reduc

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18

Ross, Darrell W., and Gary E. Daterman. "EFFICACY OF AN ANTIAGGREGATION PHEROMONE FOR REDUCING DOUGLAS-FIR BEETLE, DENDROCTONUS PSEUDOTSUGAE HOPKINS (COLEOPTERA: SCOLYTIDAE), INFESTATION IN HIGH RISK STANDS." Canadian Entomologist 127, no. 6 (1995): 805–11. http://dx.doi.org/10.4039/ent127805-6.

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AbstractThe Douglas-fir beetle (Dendroctonus pseudotsugae) antiaggregation pheromone, 3-methylcyclohex-2-en-1-one (MCH), was applied to stands at high risk for infestation. The MCH was applied in a bubble capsule formulation to plots ranging from 2.1 to 2.6 ha in size at rates of 45–76 g/ha. Catches of Douglas-fir beetles in attractant-baited Lindgren funnel traps located at the plot centers were significantly lower on MCH-treated plots compared with untreated plots. In contrast, catches of the most abundant predator, Thanasimus undatulus (Say), were unaffected by the MCH treatment. The percen

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19

Nemec, Amanda F. Linnell, Roberta Parish, and James W. Goudie. "Modelling number, vertical distribution, and size of live branches on coniferous tree species in British Columbia." Canadian Journal of Forest Research 42, no. 6 (2012): 1072–90. http://dx.doi.org/10.1139/x2012-060.

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A compound, nonhomogeneous Poisson process was used to model the number, vertical distribution, and size of branches on four coniferous tree species: 134 western hemlock ( Tsuga heterophylla (Raf.) Sarg.) on six sites, 45 amabilis fir ( Abies amabilis Douglas ex J. Forbes) (three sites), 60 lodgepole pine ( Pinus contorta var. latifolia Engelm. ex S. Watson) (six sites), and 60 white spruce ( Picea glauca (Moench) Voss) trees (five sites) and two varieties: 66 coastal Douglas-fir ( Pseudotsuga menziesii var. menziesii (Mirb.) Franco) (five sites) and 50 interior Douglas-fir ( Pseudotsuga menzi

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20

Funk, A. "Monilia versiformia sp. nov. (Hyphomycetes) from a perennial Douglas-fir canker." Canadian Journal of Botany 65, no. 1 (1987): 23–25. http://dx.doi.org/10.1139/b87-003.

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Monilia versiformia sp. nov. is a pleoanamorphic fungus producing two types of blastoconidia, viz., monilioid chains of dark-colored, sphaeroid conidia and lunate, hyaline conidia produced singly on simple, conidiogenous hyphae. The chains are produced in great abundance, and as the conidia mature and become pigmented, the chains break down and form a sooty mass. The fungus was isolated from a perennial canker of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in British Columbia, Canada.

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21

Villagómez Loza, Mario Alberto, and Miguel Ángel Bello González. "Pseudotsuga menziesii (Mirb.) Franco var. glauca (Beissn.) Franco: nuevo registro para Guanajuato." Revista Mexicana de Ciencias Forestales 6, no. 30 (2018): 66–73. http://dx.doi.org/10.29298/rmcf.v6i30.208.

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   El abeto Douglas (Pseudotsuga menziesii var. glauca) es abundante en el oeste de Estados Unidos de América y de Canadá; en contraste, su distribución natural en el territorio nacional es escasa y fragmentada, sus individuos están aislados, frecuentemente mezclados y dominados por otras especies. Abarca la porción norte de la Sierra Madre Occidental en los estados de Sonora, Chihuahua, Durango y Zacatecas; también está presente en la parte norte de la Sierra Madre Oriental en Nuevo León, Coahuila y Tamaulipas y se le encuentra en pequeños manchones en el centro del

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22

Podrázský, V., A. Martiník, K. Matějka, and J. Viewegh. "Effects of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) on understorey layer species diversity in managed forests." Journal of Forest Science 60, No. 7 (2014): 263–71. http://dx.doi.org/10.17221/49/2014-jfs.

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In total, 67 parallel plots were chosen from the database of 153 phytosociological relev&eacute;s made in the Douglas-fir and parallel Norway spruce, European Beech and oak-dominated stands to find influences of this introduced tree species on the understorey layer in totally 12 localities in the whole Czech Republic territory. Douglas-fir stands influence their habitats, which was indicated by species composition changes in the ground vegetation, as well as by abundance and dominance of particular species. Douglas-fir cultivation increases species diversity of the stands, but decreases th

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23

Schaupp, Willis C. "HOST ASSOCIATIONS IN SYMPATRIC POPULATIONS OF CHORISTONEURA OCCIDENTALIS FREEMAN AND C. RETINIANA (WALSINGHAM) (LEPIDOPTERA: TORTRICIDAE) IN SOUTH-CENTRAL OREGON AT HIGH POPULATION DENSITIES." Canadian Entomologist 123, no. 3 (1991): 713–15. http://dx.doi.org/10.4039/ent123713-3.

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Sympatric, synchronous populations of conifer-feeding Choristoneura (Lepidoptera: Tortricidae) occur in western North America (Powell 1980). Choristoneura occidentalis Freeman, the western spruce budworm, co-exists with C. retiniana, the Modoc budworm, in mixed stands of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, and true firs, Abies spp. Choristoneura occidentalis has brown larvae and a broad geographic distribution associated with one of its principle hosts, Douglas-fir (Stehr 1967). Larvae of C. retiniana are green and feed on true firs, particularly white fir, Abies concolor (Gord.

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24

Hagerman, Shannon M., and Daniel M. Durall. "Ectomycorrhizal colonization of greenhouse-grown Douglas-fir (Pseudotsuga menziesii) seedlings by inoculum associated with the roots of refuge plants sampled from a Douglas-fir forest in the southern interior of British Columbia." Canadian Journal of Botany 82, no. 6 (2004): 742–51. http://dx.doi.org/10.1139/b04-047.

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Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were grown in the greenhouse in a sterilized mixture of forest soil and vermiculite, which had been inoculated with root fragments from one of six different ectomycorrhizal under story plant species (Arctostaphylos uva-ursi (L.) Spreng, P. menziessi, Salix bebbiana Bebb, Alnus viridis subsp. sinuata (Regel) Ä. Löve & and D. Löve (alder), Betula papyrifera Marsh. (paper birch), Populus tremuloides Michx.) and arbuscular mycorrhizal Calamagrostis rubescens Buckl. (pinegrass) sampled from a dry Douglas-fir forest in the southern int

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25

Giannini, R., M. Lambardi, and G. G. Vendramin. "SOME OBSERVATIONS ON GRAFT INCOMPATIBILITY IN DOUGLAS-FIR (PSEUDOTSUGA MENZIESII MIRB. FRANCO) (*)." Acta Horticulturae, no. 227 (September 1988): 84–86. http://dx.doi.org/10.17660/actahortic.1988.227.8.

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26

WARREN, C. R., G. J. ETHIER, N. J. LIVINGSTON, et al. "Transfer conductance in second growth Douglas-fir (Pseudotsuga menziesii (Mirb.)Franco) canopies." Plant, Cell & Environment 26, no. 8 (2003): 1215–27. http://dx.doi.org/10.1046/j.1365-3040.2003.01044.x.

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27

AJIDELE, Faith Ayodeji, Josiah Thomas B. RIKI, and Abiodun Oluwafemi OLUWADARE. "Preliminary investigation on the utilisation of Douglas Fir (Pseudotsuga menziesii Mirb. Franco)." Agriculture, Food and Natural Resources Journal 3, no. 1 (2024): 1–7. https://doi.org/10.5281/zenodo.13625163.

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One of the most abundant and versatile natural resources is wood. Due to its numerous uses, the demand for wood is growing faster than the supply in many developing countries. Selected wood physical and mechanical properties of Douglas Fir wood was evaluated in this study to meet the need of wood for various applications. Wood samples from Ido Local Government of Oyo State were obtained from (base, middle, top) and (compression and normal wood side) of a 9-years old main stem for moisture content, wood density and mechanical properties. Data obtained were statistically analyzed and result reve

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28

Čater, Matjaž. "Microsites Influence the Light Response of Young Douglas-Fir (Pseudotsuga menziesii (Mirb.) Franco)." Forests 12, no. 6 (2021): 687. http://dx.doi.org/10.3390/f12060687.

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Two comparable sites with uneven-aged mixed forest stands with more than 20% Douglas-fir in the growing stock at an altitude of 650 m a.s.l. were selected. The physiological response of young trees to different light intensities was measured during the main growing season in three consecutive years, and four different light categories, which were determined from hemispherical photographs. The four light intensity categories were defined according to Indirect Site Factor (ISF%): in the open (A-ISF > 35%), at the outer forest edge (B-25% < ISF < 35%), at the inner forest edge (C-15% &lt

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Shore, T. L., L. Safranyik, W. G. Riel, M. Ferguson, and J. Castonguay. "EVALUATION OF FACTORS AFFECTING TREE AND STAND SUSCEPTIBILITY TO THE DOUGLAS-FIR BEETLE (COLEOPTERA: SCOLYTIDAE)." Canadian Entomologist 131, no. 6 (1999): 831–39. http://dx.doi.org/10.4039/ent131831-6.

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AbstractTree and site characteristics were compared between 19 groups of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco (Pinaceae), infested by Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, and 19 uninfested groups to identify individual or combinations of characteristics associated with Douglas-fir beetle attacks. Of the tree characteristics, diameter, height, age, phloem thickness, bark thickness, and a standardized variable consisting of diameter divided by the last 10 years growth rate (DBHTYG) showed significant differences. None of the site characteristics showed significant

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Staudhammer, Christie, and Valerie LeMay. "Height prediction equations using diameter and stand density measures." Forestry Chronicle 76, no. 2 (2000): 303–9. http://dx.doi.org/10.5558/tfc76303-2.

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Height equations for western hemlock (Tsuga heterophylla (Raf.) Sarg.), western red cedar (Thuja plicata Donn), Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), and alder (Alnus rubra Bong. and Alnus tenuifolia Nutt.) were fitted using dbh as the predictor variable. A simple, non-linear equation gave very similar results to the Weibull distribution, except for hemlock, which was better modelled using the more flexible Weibull distribution function. Introducing stand density variables into the base equations resulted in increased accuracy for predicting heights of alder. Smaller improvements

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Solheim, Halvor, and Paal Krokene. "Growth and virulence of Ceratocystis rufipenni and three blue-stain fungi isolated from the Douglas-fir beetle." Canadian Journal of Botany 76, no. 10 (1998): 1763–69. http://dx.doi.org/10.1139/b98-146.

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Blue-stain fungi were isolated from the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, and from Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, colonized by the beetle. Growth of the three most commonly isolated blue-stain fungi (Leptographium abietinum (Peck) Wingfield, Ophiostoma europhioides (Wright & Cain) Solheim, Ophiostoma pseudotsugae (Rumbold) von Arx), and Ceratocystis rufipenni Wingfield, Harrington, & Solheim, an important associate of the spruce beetle, Dendroctonus rufipennis (Kirby), was studied in sapwood and phloem of live Douglas-fir trees, on malt agar, an

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32

Campbell, Bruce C., and Patrick J. Shea. "A SIMPLE STAINING TECHNIQUE FOR ASSESSING FEEDING DAMAGE BY LEPTOGLOSSUS OCCIDENTALIS HEIDEMANN (HEMIPTERA: COREIDAE) ON CONES." Canadian Entomologist 122, no. 5 (1990): 963–68. http://dx.doi.org/10.4039/ent122963-9.

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AbstractPectinmethylesterase (PME) activity was found in the salivary glands of nymphs and adults of a leaf-footed bug, Leptoglossus occidentalis Heidemann. Puncture wounds in cone scales resulting from PME activity in the saliva of these bugs were seen by staining with a 0.05% aqueous solution of ruthenium red. This staining technique can be used to estimate feeding damage by L. occidentalis on cones of western white pine (Pinus monticola Dougl.), sugar pine (P. lambertiana Dougl.), and Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco).

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33

Daoudi, EL-Hassania, and Marc Bonnet-Masimbert. "Polyamines conjuguées et différenciation florale chez le sapin de Douglas (Pseudotsuga menziesii (Mirb.) Franco)." Canadian Journal of Botany 76, no. 5 (1998): 782–90. http://dx.doi.org/10.1139/b98-044.

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To characterize as early as possible the status of flowering differentiation in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), the variation of bound or conjugated polyamines is studied in the shoots of young plants (6 years old) during the period covering flowering initiation (between 30 and 75 days after bud burst). These compounds are also quantified in sexual and vegetative buds. The quantitative effects of treatments susceptible to stimulate the flowering (application of gibberellins and (or) calcium nitrate) on the level of conjugated polyamines are investigated in the shoots. The c

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Allen, Gregory B., Kendrick J. Brown, and Richard J. Hebda. "Surface pollen spectra from southern Vancouver Island, British Columbia, Canada." Canadian Journal of Botany 77, no. 6 (1999): 786–99. http://dx.doi.org/10.1139/b99-038.

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Analyses of surface samples of 84 sites from southern Vancouver Island were used to characterize pollen and spore spectra of modern vegetation types. Xeric Quercus garryana Dougl. and grassland associations can be identified by Quercus pollen and abundant nonarboreal pollen, respectively. Coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) forests are distinguished by high proportions of Pseudotsuga and low Pseudotsuga to Tsuga heterophylla (Raf.) Sarg. ratios. Coastal Western Hemlock zone forests have abundant Tsuga heterophylla pollen. Dry Coastal Western Hemlock subzon

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Smolnikar, Peter, Robert Brus, and Kristjan Jarni. "Differences in Growth and Log Quality of Douglas-Fir (Pseudotsuga menziesii (Mirb.) Franco) Provenances." Forests 12, no. 3 (2021): 287. http://dx.doi.org/10.3390/f12030287.

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Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) is a non-native conifer from western North America that was introduced into European forests at the end of the 19th century. Plantations of Douglas-fir in Europe have shown good performance, quality, and resilience to exacerbating climatic conditions. However, all these qualities strongly depend on provenance. A total of 1061 surviving trees of fifteen different Douglas-fir provenances were measured in a Slovenian provenance trial that was established within the framework of the 1966/1967 IUFRO seed collection program. We found significant dif

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Levanič, Tom, and Hana Štraus. "Effects of Climate on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) Growth Southeast of the European Alps." Plants 11, no. 12 (2022): 1571. http://dx.doi.org/10.3390/plants11121571.

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Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) is a non-native tree species in Slovenia with the potential to partially replace Norway spruce in our native forests. Compared to spruce, it has several advantages in terms of volume growth, wood quality and tolerance to drought. This is important given the changing climate in which spruce is confronted with serious problems caused by increasing temperatures and drought stress. At three sites (one on non-carbonate bedrock and deep soils, and two on limestone with soil layers of varying depths), 20 Douglas-fir and 20 spruce per site were sample

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Newton, Michael, and Elizebeth C. Cole. "A Sustained-Yield Scheme for Old-Growth Douglas-fir." Western Journal of Applied Forestry 2, no. 1 (1987): 22–25. http://dx.doi.org/10.1093/wjaf/2.1.22.

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Abstract From analysis of two Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) stands, 120 and 140 years old, we conclude that managed stands can meet established criteria for old-growth Douglas-fir and simultaneously produce near-maximum yields of good-quality timber. With the management approach outlined here, average annual volume growth may approach that of shorter-rotation culture, but in logs of a size and quality normally found only in older stands, and with minimal impact on high-risk watersheds or old-growth habitat. This possibility encourages development of silvicultural systems t

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Thier, R. W., and Steve Patterson. "Mortality of Douglas-fir After Operational Semiochemical Baiting for Douglas-fir Beetle (Coleoptera: Scolytidae)." Western Journal of Applied Forestry 12, no. 1 (1997): 16–20. http://dx.doi.org/10.1093/wjaf/12.1.16.

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Abstract Effects of an operational application of synthetic Douglas-fir beetle (Dendroctonus pseudotsugae Hopkins) attractants applied to Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) trees have not been well documented. Baits, containing a 1:1 mixture of frontalin and alpha-pinene, were deployed over 64 acres in an area application at the rate of 2 baits/ac. Baited trees, and unbaited Douglas-firs surrounding the bait centers, were selected for measurements. All baited trees were attacked along with 42.3% of the surrounding unbaited Douglas-firs. Attacked trees were significantly larger

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Prenzel, Björn G., William G. Laidlaw, and Hal Wieser. "WITHIN-TREE DYNAMICS OF MASS ATTACK BY DENDROCTONUS PSEUDOTSUGAE (COLEOPTERA: SCOLYTIDAE) ON ITS HOST." Canadian Entomologist 131, no. 5 (1999): 635–43. http://dx.doi.org/10.4039/ent131635-5.

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AbstractThe within-tree scale dynamics of mass attack by the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, on its host were investigated and quantified. Seven similarly sized Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco (Pinaceae), infested as part of several pheromone-induced infestations, were monitored over an entire attack season. Ninety percent of the attacks on mass-attacked trees occurred within 3 weeks of colonization; the remaining 10% occurred gradually over the remaining 7 weeks of the attack season. Vertical attack distribution followed a Gaussian form that shifted up

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García, O. "Estimating top height with variable plot sizes." Canadian Journal of Forest Research 28, no. 10 (1998): 1509–17. http://dx.doi.org/10.1139/x98-128.

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Conventional top height estimates are biased if the area of the sample plot differs from that on which the definition is based. Sources of bias include a sampling selection effect and spatial autocorrelation. The problem was studied in relation to the use of data sets with varying spatial detail for modelling Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation growth. Improved top height estimators, developed taking into account the selection effect, eliminated the bias. Bias was reduced, but not eliminated completely, when the estimators were tested using more highly autocorrelated

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Fontes, L. "Modelling dominant height growth of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in Portugal." Forestry 76, no. 5 (2003): 509–23. http://dx.doi.org/10.1093/forestry/76.5.509.

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Schütz, J. P., and A. Pommerening. "Can Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) sustainably grow in complex forest structures?" Forest Ecology and Management 303 (September 2013): 175–83. http://dx.doi.org/10.1016/j.foreco.2013.04.015.

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Puettmann, Klaus J., David W. Hann, and David E. Hibbs. "Evaluation of the Size-Density Relationships for Pure Red Alder and Douglas-Fir Stands." Forest Science 39, no. 1 (1993): 7–27. http://dx.doi.org/10.1093/forestscience/39.1.7.

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Abstract Size-density trajectories were developed for pure red alder (Alnus rubra Bong) and Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) stands with quadratic mean diameter of the stand as the tree-size variable. The resulting self-thinning or maximum size-density line for red alder had a steeper slope (-0.64) than that for Douglas-fir (-0.52). The assumption of a common slope for all species is therefore not supported by our study. For red alder, the shape of the size-density trajectory and the elevation of the maximum line were not influenced by initial density or stand origin. Red ald

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Petkova, K., M. Georgieva, and M. Uzunov. "Investigation of Douglas-fir provenance test in North-Western Bulgaria at the age of 24 years." Journal of Forest Science 60, No. 7 (2014): 288–96. http://dx.doi.org/10.17221/12/2014-jfs.

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A comparative analysis of growth rate and health condition of 54 Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) provenances was conducted at the age of 24 years. The provenance test was established in 1990 with 3-year-old (3+0) seedlings planted in a 2 &times; 2 m plot design and two replications. The provenances which were studied originated from North America and were separated into coastal, continental and Western Cascade groups. In 2011 the growth rate was studied in terms of height, diameter at breast height and stem volume. The health condition was assessed by the evidence of sym

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Muller, C., E. Falleri, E. Laroppe, and M. Bonnet-Masimbert. "Drying and storage of prechilled Douglas fir, Pseudotsuga menziesii, seeds." Canadian Journal of Forest Research 29, no. 2 (1999): 172–77. http://dx.doi.org/10.1139/x98-193.

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Douglas fir, Pseudotsuga menziesii (Mirb.) Franco, seeds exhibit relative dormancy as they do not germinate at suboptimal temperature (15°C), whereas at optimal temperature (20°C) some germination occurred. Thus, germination at 15°C was chosen to estimate dormancy release. In the first experiment, seeds were prechilled at 32% moisture content (MC) for 0-34 weeks at 3°C. Long chilling treatments enhanced germinability and, more markedly, germination speed both at 20°C and at 15°C. Seeds pretreated for the longest periods were then dried to 6.7% MC and stored up to 6 months without any detriment

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Mazzola, M., and J. F. Costante. "Efficacy of BA For the Promotion of Lateral Bud Formation on Douglas-fir and Colorado Blue Spruce." HortScience 22, no. 2 (1987): 234–35. http://dx.doi.org/10.21273/hortsci.22.2.234.

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Abstract A whole-tree foliar application of BA at a concentration of 1000 ppm increased lateral bud density on douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] but not on Colorado blue spruce (Picea pungens Englm.) when treated ≈6 weeks after budbreak. A single BA application made at the same time, but only to the terminal leader, was not effective in increasing overall lateral bud density on either the terminal or lateral branches of either species. Lammas shoots formed on all trees that received whole-tree applications of BA. Bud formation on lammas shoots appeared normal for douglas-fir b

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Rappaport, Nancy G., and David L. Wood. "PITYOPHTHORUS ORARIUS BRIGHT (COLEOPTERA: SCOLYTIDAE) IN A NORTHERN CALIFORNIA DOUGLAS-FIR SEED ORCHARD: EFFECT OF CLONE, TREE VIGOR, AND CONE CROP ON RATE OF ATTACK." Canadian Entomologist 126, no. 5 (1994): 1111–18. http://dx.doi.org/10.4039/ent1261111-5.

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AbstractThe geographic range of the Douglas-fir twig beetle, Pityophthorus orarius Bright, was extended beyond the original provenance of southern British Columbia to northern California. A survey of 457 Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] trees in 1985 revealed that those with heavy cone crops were more likely to be infested by twig beetles than were those with a light crop. Furthermore, attack rates differed among clones. A second survey done in 1987 confirmed the importance of clone and cone crop in attack rate. In this survey, stressed trees were attacked at a higher rate th

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LeDoux, Chris B., Roger D. Fight, and Tom L. Ortman. "Stump-to-Truck Cable Logging Cost Equations for Young-Growth Douglas-fir." Western Journal of Applied Forestry 1, no. 1 (1986): 19–22. http://dx.doi.org/10.1093/wjaf/1.1.19.

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Abstract Logging cost simulators and data from logging cost studies have been assembled and converted into a series of equations that can be used to estimate the cost of logging young-growth coastal Douglas-fir. (Pseudotsuga menziesii [Mirb.] Franco var. menziesii) in mountainous terrain of the Pacific Northwest. These equations were developed for two small cable yarders and one medium-sized yarder and are applicable for harvests of timber from 6 to 24 inches in diameter on slopes of 10 to 50%. Cost components can be easily Calculated on a hand calculator. A computer program that can be adapte

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Selosse, M. A., D. Bouchard, F. Martin, and F. Le Tacon. "Effect of Laccaria bicolor strains inoculated on Douglas-fir (Pseudotsuga menziesii) several years after nursery inoculation." Canadian Journal of Forest Research 30, no. 3 (2000): 360–71. http://dx.doi.org/10.1139/x99-221.

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In the Saint-Brisson experiment conducted in central France, the American strain of the ectomycorrhizal fungus Laccaria bicolor (Maire) P.D. Orton S238N and the French strain L. bicolor 81306 inoculated on containerized Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings increased by 60% the total volume of wood produced 8 years after outplanting as compared with uninoculated but naturally mycorrhizal trees. The two strains introduced 10 years before in the inoculated plots are still present and dominant; they did not prevent the colonization of Douglas-fir roots by naturally occurrin

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Pyles, Marvin R., and Joan Stoupa. "Load-Carrying Capacity of Second-Growth Douglas-Fir Stump Anchors." Western Journal of Applied Forestry 2, no. 3 (1987): 77–80. http://dx.doi.org/10.1093/wjaf/2.3.77.

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Abstract In order to quantify the stump anchor capacity of small second-growth Douglas-fir (Pseudotsuga menziesii [Mirb]. Franco) trees, load tests to failure were conducted on 18 stumps from trees 7 to 16.5 in dbh. The tests produced ultimate loads that varied as the square of the tree diameter. However, the ultimate load typically occurred at stump system deformations that were far in excess of that which would be considered failure of a stump anchor. A hyperbolic equation was used to describe the load-deformation behavior of each stump tested and was generalized to describe all the test res

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