SUPPLEMENTARY LIGHTING AND CO2 ENRICHMENT FOR ACCELERATED GROWTH OF SELECTED WOODY ORNAMENTAL SEEDLINGS AND ROOTED CUTTINGS

1982 ◽  
Vol 62 (3) ◽  
pp. 703-707 ◽  
Author(s):  
W. C. LIN ◽  
J. M. MOLNAR
Keyword(s):  
Pseudotsuga Menziesii ◽  
Picea Glauca ◽  
Co2 Enrichment ◽  
White Spruce ◽  
Douglas Fir ◽  
Light Sources ◽  
Ilex Aquifolium ◽  
English Holly ◽  
Accelerated Growth ◽  
Supplementary Lighting

Daily 16-h (0400–2000 h) supplementary lighting with high-pressure sodium (HPS) lamps at 45 μE∙m2∙sec−1 increased growth of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), white spruce (Picea glauca (Moench) Voss), crape-myrtle (Lagerstroemia indica L.), and seven cultivars of English holly (Ilex aquifolium L.). Enrichment of greenhouse atmosphere with CO2 to 1000–1300 ppm increased growth of four cultivars of English holly. In comparing two different light sources in CO2-enriched greenhouses, low-pressure sodium (LPS) lamps at 42 μE∙m−2∙sec−1 were found as effective as HPS in increasing growth of white spruce, crape-myrtle, and five cultivars of English holly, but not so effective in Douglas-fir and three cultivars of English holly.

PINE OIL PROTECTS LIVING TREES FROM ATTACK BY THREE BARK BEETLE SPECIES, DENDROCTONUS SPP. (COLEOPTERA: SCOLYTIDAE)

1981 ◽  
Vol 113 (4) ◽  
pp. 337-340 ◽  
Author(s):  
W. W. Nijholt ◽  
L. H. McMullen ◽  
L. Safranyik
Keyword(s):  
Pseudotsuga Menziesii ◽  
Picea Glauca ◽  
Pinus Contorta ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Douglas Fir ◽  
Dendroctonus Pseudotsugae ◽  
Pine Oil ◽  
Spruce Beetle ◽  
Pine Beetle

AbstractPine oil, a by-product of sulphate wood pulping, protected pheromone-baited, living Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), lodgepole pine (Pinus contorta Dougl.), and spruce (Picea glauca (Moench) Voss - P. engelmannii Parry hybrids) from attack by Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.), mountain pine beetle (D. ponderosa Hopk.), and spruce beetle (D. rufipennis (Kirby)), respectively. Pine oil also protected surrounding trees and reduced attack incidence on Douglas-fir, lodgepole pine, and spruce within at least a 10 m radius. α-Terpineol, one of the constituents of the pine oil mixture, was less effective.

The Biology of Adelges cooleyi (Gill.) (Homoptera: Phylloxeridae)

1959 ◽  
Vol 91 (10) ◽  
pp. 601-617 ◽  
Author(s):  
Margaret E. P. Gumming
Keyword(s):  
North America ◽  
Pseudotsuga Menziesii ◽  
Tree Species ◽  
Picea Glauca ◽  
Douglas Fir ◽  
Alternate Host ◽  
Shade Tree ◽  
Engelmann Spruce ◽  
Shelter Belt ◽  
Adelges Cooleyi

Adelges cooleyi (Gill.) causes galls on spruce in the forests and on shelter-belt and shade-tree plantings in Alberta. The alternate host is Douglas fir, on which the injury is less conspicuous. The tree species affected are white spruce, Picea glauca (Moench) Voss, Engelmann spruce, P. engelmanni Parry, and blue Douglas fir, Pseudotsuga menziesii (Mirb.) Franco. A. cooleyi is indigenous to North America.

Winter use of montane forests by porcupines in southwestern Alberta: preferences, density effects, and temporal changes

1980 ◽  
Vol 58 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Lawrence D. Harder
Keyword(s):  
Pseudotsuga Menziesii ◽  
Picea Glauca ◽  
Montane Forest ◽  
Douglas Fir ◽  
Low Density ◽  
Erethizon Dorsatum ◽  
Pinus Flexilis ◽  
Limber Pine ◽  
Density Effects ◽  
Hybrid Spruce

The pattern of winter use of montane forest by porcupines (Erethizon dorsatum) during a 40-year period was examined on two areas in southwestern Alberta. Of the three available coniferous communities, porcupines fed in relatively more trees in pure stands of Douglas fir (Pseudotsuga menziesii) in leeward situations. Douglas fir, limber pine (Pinus flexilis), and hybrid spruce (Picea glauca × P. engelmannii) were used with equivalent frequency when found in the same community. The number of porcupines that used both areas peaked and declined in relation to the average ages of the forests. Trees in low density stands (< 11 trees/100 m2) were fed in during more years than those in denser stands and the use of dense stands was more frequent during years when porcupines were most abundant. Differences between the study areas in repeated feeding in leeward Douglas fir and in the relative proportions of trees used in low and high density stands are attributed to differences in the abundance of porcupines.

scholarly journals Pathogenicity and Virulence of Pythium Species Obtained from Forest Nursery Soils on Douglas-Fir Seedlings

Plant Disease ◽  
2013 ◽  
Vol 97 (6) ◽  
pp. 744-748 ◽  
Author(s):  
Jerry E. Weiland ◽  
Bryan R. Beck ◽  
Anne Davis
Keyword(s):  
Pseudotsuga Menziesii ◽  
Seedling Survival ◽  
The United States ◽  
Douglas Fir ◽  
Tree Seedlings ◽  
Pythium Species ◽  
Forest Nursery ◽  
Damping Off ◽  
Greenhouse Study ◽  
Forest Nurseries

Pythium species are common soilborne oomycetes that occur in forest nursery soils throughout the United States. Numerous species have been described from nursery soils. However, with the exception of P. aphanidermatum, P. irregulare, P. sylvaticum, and P. ultimum, little is known about the potential for other Pythium species found in nursery soils to cause damping-off of tree seedlings. A greenhouse study was conducted to evaluate the pathogenicity and virulence of 44 Pythium isolates representing 16 species that were originally recovered from soil at three forest nurseries in Washington and Oregon. Seeds of Douglas-fir (Pseudotsuga menziesii) were planted into soil infested with each of the isolates. Seedling survival, the number of surviving seedlings with necrotic root lesions, and taproot length were evaluated 4 weeks later. Responses of Douglas-fir to inoculation varied significantly depending on Pythium species and isolate. Eight species (P. dissotocum, P. irregulare, P. aff. macrosporum, P. mamillatum, P. aff. oopapillum, P. rostratifingens, P. sylvaticum, and P. ultimum var. ultimum) significantly reduced the number of surviving seedlings compared to the noninoculated treatment. However, all Pythium species caused a greater percentage of seedlings to develop root lesions (total mean 40%) than was observed from noninoculated seedlings (17%). Taproot length varied little among Pythium treatments and was not a useful character for evaluating pathogenicity. Results confirm the ability of P. irregulare, P. mamillatum, and P. ultimum var. ultimum to cause damping-off of Douglas-fir seedlings, and are indicative that other species such as P. dissotocum, P. aff. macrosporum, P. aff. oopapillum, P. rostratifingens, and P. sylvaticum may also be responsible for seedling loss.

Cylindrocarpon and Fusarium root colonization of Douglas-fir seedlings from British Columbia reforestation sites

1998 ◽  
Vol 28 (8) ◽  
pp. 1198-1206 ◽  
Author(s):  
Paige E Axelrood ◽  
William K Chapman ◽  
Keith A Seifert ◽  
David B Trotter ◽  
Gwen Shrimpton
Keyword(s):  
British Columbia ◽  
Pseudotsuga Menziesii ◽  
Root Colonization ◽  
Linear Trend ◽  
Poor Performance ◽  
Douglas Fir ◽  
Root Infection ◽  
Significant Linear Trend ◽  
Conifer Seedlings ◽  
Cylindrocarpon Destructans

Poor performance of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantations established in 1987 has occurred in southwestern British Columbia. Affected sites were planted with 1-year-old container stock that exhibited some root dieback in the nursery. A study was initiated in 1991 to assess Cylindrocarpon and Fusarium root infection in planted and naturally regenerating (natural) Douglas-fir seedlings from seven affected plantations. Percentages of seedlings harboring Cylindrocarpon spp.and percent root colonization were significantly greater for planted seedlings compared with natural seedlings. A significant linear trend in Cylindrocarpon root colonization was observed for planted seedlings with colonization levels being highest for roots closest to the remnants of the root plug and decreasing at distances greater than 10cm from that region. This trend in Cylindrocarpon colonization was not observed for natural seedlings. Cylindrocarpon destructans (Zins.) Scholten var. destructans and C.cylindroides Wollenw. var. cylindroides were the only species isolated from planted and natural conifer seedlings. For most sites, percentage of seedlings harboring Fusarium spp.and percent Fusarium root colonization were less than for Cylindrocarpon. Recovery of Fusarium spp.from seedlings and root colonization levels were not significantly different for planted and natural seedlings from all sites.

WHITE SPRUCE AND THE SPRUCE BUDWORM: DEFINING THE PHENOLOGICAL WINDOW OF SUSCEPTIBILITY

1997 ◽  
Vol 129 (2) ◽  
pp. 291-318 ◽  
Author(s):  
Robert K. Lawrence ◽  
William J. Mattson ◽  
Robert A. Haack
Keyword(s):  
Picea Glauca ◽  
High Performance ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
White Spruce ◽  
Shoot Elongation ◽  
Larval Survival ◽  
Strongly Correlated ◽  
Negative Effect ◽  
Foliar Traits

AbstractSynchrony of insect and host tree phenologies has often been suggested as an important factor influencing the susceptibility of white spruce, Picea glauca (Moench) Voss, and other hosts to the spruce budworm, Choristoneura fumiferana (Clemens) (Lepidoptera: Tortricidae). We evaluated this hypothesis by caging several cohorts of spruce budworm larvae on three white spruce populations at different phenological stages of the host trees, and then comparing budworm performance with host phenology and variation of 13 foliar traits. The beginning of the phenological window of susceptibility in white spruce occurs several weeks prior to budbreak, and the end of the window is sharply defined by the end of shoot growth. Performance was high for the earliest budworm cohorts that we tested. These larvae began feeding 3–4 weeks prior to budbreak and completed their larval development prior to the end of shoot elongation. Optimal synchrony occurred when emergence preceded budbreak by about 2 weeks. Larval survival was greater than 60% for individuals starting development 1–3 weeks prior to budbreak, but decreased to less than 10% for those starting development 2 or more weeks after budbreak and thus completing development after shoot elongation ceased. High performance by the budworm was most strongly correlated with high levels of foliar nitrogen, phosphorous, potassium, copper, sugars, and water and low levels of foliar calcium, phenolics, and toughness. These results suggest that advancing the usual phenological window of white spruce (i.e. advancing budbreak prior to larval emergence) or retarding budworm phenology can have a large negative effect on the spruce budworm’s population dynamics.

Sign in / Sign up

Export Citation Format

Share Document