Stability of resistance among Pinuscontorta provenances to Lophodermellaconcolor needle cast

1987 ◽  
Vol 17 (12) ◽  
pp. 1596-1601 ◽  
Author(s):  
Cheng C. Ying ◽  
R. S. Hunt
Keyword(s):  
British Columbia ◽  
Lodgepole Pine ◽  
High Elevation ◽  
Geographic Region ◽  
Needle Cast ◽  
Seed Sources ◽  
Provenance Trials ◽  
Genetically Improved ◽  
Stability Of Resistance ◽  
High Degree

Lophodermellaconcolor needle cast was rated in 41 lodgepole pine (Pinuscontorta) provenance trials in the central and southern interior of British Columbia. Moist, low-elevation sites were most severely affected while sites at high elevation and in dry climatic zones were free of L. concolor. Lodgepole pine populations exhibited a high degree of stability (low site by provenance interaction) and genetic variability in resistance to L. concolor. These characteristics favor selecting resistant seed sources and incorporating them into genetically improved stock. Most provenances, other than those from the interior British Columbia and Alberta geographic region, were extremely susceptible to L. concolor. Susceptibility to L. concolor increased with the elevation of provenance for those provenances of interest to silviculturalists and tree improvement specialists in the interior of British Columbia.

Geographic variation, nursery effects, and early selection in lodgepole pine

1989 ◽  
Vol 19 (7) ◽  
pp. 832-841 ◽  
Author(s):  
C. C. Ying ◽  
C. Thompson ◽  
L. Herring
Keyword(s):  
British Columbia ◽  
Lodgepole Pine ◽  
Field Performance ◽  
Field Trials ◽  
Short Term ◽  
Interior Region ◽  
Seed Transfer ◽  
Seed Sources ◽  
Coastal British Columbia ◽  
Seed Transfer Guidelines

Thirty provenances of lodgepole pine (Pinuscontorta Dougl.) test stock raised at two nurseries, Cowichan Lake (coastal British Columbia) and Red Rock (interior British Columbia), were assessed in two 15-year field trials. Analyses indicated three broad geographic regions of genetic differentiation in British Columbia: coast, coast–interior transition, and central and southern interior. Provenance elevation was found to have a strong influence on growth. The results suggest that the present seed transfer guidelines for lodgepole pine in the interior region of this province are conservative enough to prevent the use of maladapted seed sources. Nursery effect declined over a period of 15 years, while provenance differences increased with the age of the trials. Interactions between provenances and sites also increased after age 9. This suggests that the effect due to seedling culture and environment in the nursery is short-term relative to the influence of the genetic component. Nursery growth was generally not a good predictor of provenance field performance.

Stability of resistance to western gall rust and needle cast in lodgepole pine provenances

1998 ◽  
Vol 28 (3) ◽  
pp. 439-449 ◽  
Author(s):  
Harry X Wu ◽  
Cheng C Ying
Keyword(s):  
Pinus Banksiana ◽  
Pinus Contorta ◽  
Lodgepole Pine ◽  
Genetic Selection ◽  
Jack Pine ◽  
Needle Cast ◽  
Geographic Patterns ◽  
Endocronartium Harknessii ◽  
Stability Of Resistance ◽  
Site Evaluation

Stability of 76 interior lodgepole pine (Pinus contorta ssp. latifolia Engelm.) provenances in resistance to western gall rust (Endocronartium harknessii (J.P. More) Y. Hiratsuka) and needle cast (Lophodermella concolor (Dearn.) Darker) was investigated from 19 and 23 sites in the British Columbia interior, respectively. Provenances, sites, and provenance by site interaction had significant effects on severity level of infection of both diseases. Susceptible provenances contributed mainly to the interaction. The resistant provenances to both diseases were very stable and essentially homeostatic across sites (regression coefficient approaching 0). Resistant provenances were concentrated in the jack pine (Pinus banksiana Lamb.) - lodgepole pine hybrid zone and adjacent areas, and provenances from the low-elevation interior wetbelt were also very resistant to needle cast. Geographic patterns of provenance variation revealed that the closer a lodgepole pine provenance is to the limit of jack pine distribution, the higher and more stable is its resistance to western gall rust and needle cast. The current multiple-site evaluation supports for the hypothesis that jack pine introgression influences pest defence in lodgepole pine and suggests genetic selection can be effective.

Chemosystematic studies in the genus Pinus. V. Variation in the leaf oil terpene composition of young and old lodgepole pine trees from different moisture regimes near Prince George, British Columbia

1985 ◽  
Vol 15 (5) ◽  
pp. 801-808 ◽  
Author(s):  
E. Von Rudloff ◽  
Martin S. Lapp ◽  
R. G. McMinn
Keyword(s):  
British Columbia ◽  
Lodgepole Pine ◽  
Volatile Oil ◽  
Provenance Trials ◽  
Moisture Regimes ◽  
Pine Trees ◽  
Leaf Oil ◽  
Natural Stands ◽  
Old Trees ◽  
Resin Canals

The leaf oil terpene composition of lodgepole pine stands from contrasting moisture regimes (400–1200 mm precipitation) within upland and bog sites in the Prince George area of central British Columbia was investigated. In addition to the terpene patterns recorded previously, a new one with relatively high percentages (5–28%) of the terpinene group was found. This pattern was encountered mainly in old trees with very low yields (less than 0.1%) of volatile oil, especially in trees from shaded stands. The absence of resin canals in the leaves of such trees may be the reason for the low yields, but the reason for the link with relatively high terpinene group percentages is obscure. Young trees growing in the vicinity of such stands had mainly the normal patterns. No differences between upland and bog sites or dry and wet sites were found in young trees. Hence, old trees from bogs or wet sites east of Prince George provided progeny with the normal terpene patterns, even though many of the old trees have the new terpene pattern. Samples from two 12- to 13-year-old provenance trials originating from west and east of Prince George had terpene patterns similar to those of the young trees from the natural stands.

scholarly journals Height Growth Models for High-Elevation Subalpine Fir, Engelmann Spruce, and Lodgepole Pine in British Columbia

2000 ◽  
Vol 15 (2) ◽  
pp. 62-69 ◽  
Author(s):  
Han Y. H. Chen ◽  
Karel Klinka
Keyword(s):  
British Columbia ◽  
Growth Models ◽  
Lodgepole Pine ◽  
Site Index ◽  
High Elevation ◽  
Logistic Function ◽  
Height Growth ◽  
Potential Productivity ◽  
Subalpine Fir ◽  
Engelmann Spruce

Abstract To estimate potential productivity of the high-elevation Engelmann Spruce and Subalpine Fir (ESSF) zone of British Columbia forests, the height growth models developed from low-elevation forests are currently used to estimate site indices of subalpine fir (Abies lasiocarpa), Engelmann spruce (Picea engelmannii), and lodgepole pine (Pinus contorta). Whether these models are adequate to describe height growth of high-elevation forests is of concern. We sampled a total of 319 naturally established, even-aged, and undamaged stands with breast height age ≥50 yr (165 for subalpine fir, 87 for Engelmann spruce, and 67 for lodgepole pine) ranging widely in climate and available soil moisture and nutrients. In each sampled stand, three dominant trees were destructively sampled for stem analysis. Height growth models developed from fitting data to a conditioned logistic function explained > 97% variation in height for all three study species. Examined by residual analysis, no models showed lack of fit. These models provided more accurate estimates of site index than the currently used models developed from low-elevation stands or different species. It is recommended that the models developed in this study be applied to estimate site index of the three species in the ESSF zone in British Columbia. West. J. Appl. For. 15(2):62-69.

Effects of elevation and forest cover on winter birds in mature forest ecosystems of southern British Columbia

2004 ◽  
Vol 82 (11) ◽  
pp. 1720-1730 ◽  
Author(s):  
Jim R Herbers ◽  
Robert Serrouya ◽  
Katherine A Maxcy
Keyword(s):  
British Columbia ◽  
Forest Cover ◽  
Forest Ecosystems ◽  
Lodgepole Pine ◽  
Previous History ◽  
Bird Species ◽  
High Elevation ◽  
Mature Forest ◽  
Bird Density ◽  
Coarse Filter

Winter diversity, distribution, and density of nonmigratory birds were examined in six mature forest ecosystems from two study areas in southern British Columbia. Forest age ranged from 91 to 150 years and the ecosystems ranged from 500 to 2100 m above sea level. Sampled forest stands had no previous history of logging and were a minimum 30 ha in size. The main objectives of this study were to measure nonmigratory birds in relation to elevation and to percentage of stand-level lodgepole pine composition. Twenty-one nonmigratory bird species totaling 2747 observations were detected at 775 point-count stations in 107 stands using 10-min unlimited-distance point counts. Pine siskins (Carduelis pinus (Wilson, 1810)), red-breasted nuthatches (Sitta canadensis L., 1766), and red crossbills (Loxia curvirostra L., 1758) were the three most commonly detected species. Mature forests at low elevation had between 1.7 and 3.5 times more species and between 2.0 and 4.7 times more birds than forests at high elevation. In addition, species richness and bird density declined with increasing stand-level composition of lodgepole pine. We suggest that low-elevation ecosystems be given high priority in coarse-filter management of winter bird habitat.

Variation in damage among Pinuscontorta provenances caused by the needle cast fungus Lophodermellaconcolor

1987 ◽  
Vol 17 (7) ◽  
pp. 594-597 ◽  
Author(s):  
R. S. Hunt ◽  
C. C. Ying ◽  
D. Ashbee
Keyword(s):  
British Columbia ◽  
Analysis Of Variance ◽  
Lodgepole Pine ◽  
Test Site ◽  
Single Test ◽  
Needle Cast ◽  
Continental Climate

Fifty-three family-structured provenances of lodgepole pine (Pinuscontorta var. latifolia) growing at a single test site near Prince George, British Columbia, were rated visually by two different methods for needle casting caused by Lophodermellaconcolor in 1982 and 1984. Analysis of variance indicated little variation due to families and much due to provenance. There were consistent year-to-year trends among the provenances and the two rating methods correlated by 0.9. This variation was significantly correlated with longitude and elevation but only slightly with latitude. Damage among the 41 provenances that are adapted to the continental climate of interior British Columbia increased with elevation.

scholarly journals Spore Dispersal by Dothistroma septosporum in Northwest British Columbia

2015 ◽  
Vol 105 (1) ◽  
pp. 69-79 ◽  
Author(s):  
Kennedy Boateng ◽  
Kathy J. Lewis
Keyword(s):  
British Columbia ◽  
Lodgepole Pine ◽  
Summer Precipitation ◽  
Disease Spread ◽  
Spore Dispersal ◽  
Mixed Species ◽  
Inoculum Sources ◽  
Pine Trees ◽  
Dothistroma Septosporum ◽  
Needle Blight

We studied spore dispersal by Dothistroma septosporum, causal agent of a serious outbreak of red band needle blight in lodgepole pine plantations in northwest British Columbia. Spore abundance was assessed at different distances and heights from inoculum sources and microclimatic factors were recorded during two consecutive years. Conidia were observed on spore traps from June to September during periods of rainfall. It was rare to detect spores more than 2 m away from inoculum sources. The timing and number of conidia dispersed were strongly tied to the climatic variables, particularly rainfall and leaf wetness. Should the trend toward increased spring and summer precipitation in the study area continue, the results suggest that disease spread and intensification will also increase. Increasing the planting distances between lodgepole pine trees through mixed species plantations and overall reduction in use of lodgepole pine for regeneration in wet areas are the best strategies to reduce the spread of the disease and enhance future productivity of plantations in the study area.

scholarly journals Identifying and Characterizing Important Trembling Aspen Competitors with Juvenile Lodgepole Pine in Three South-Central British Columbia Ecosystems

2012 ◽  
Vol 2012 ◽  
pp. 1-12
Author(s):  
Teresa A. Newsome ◽  
Jean L. Heineman ◽  
Amanda F. Linnell Nemec
Keyword(s):  
British Columbia ◽  
Lodgepole Pine ◽  
Geographic Range ◽  
Regression Analyses ◽  
Relative Height ◽  
Trembling Aspen ◽  
Ecosystem Productivity ◽  
Height Ratio ◽  
Critical Height ◽  
South Central

Critical height ratios for predicting competition between trembling aspen and lodgepole pine were identified in six juvenile stands in three south-central British Columbia ecosystems. We used a series of regression analyses predicting pine stem diameter from the density of neighbouring aspen in successively shorter relative height classes to identify the aspen-pine height ratio that maximizedR2. Critical height ratios varied widely among sites when stands were 8–12 years old but, by age 14–19, had converged at 1.25–1.5. MaximumR2values at age 14–19 ranged from 13.4% to 69.8%, demonstrating that the importance of aspen competition varied widely across a relatively small geographic range. Logistic regression also indicated that the risk of poor pine vigour in the presence of aspen varied between sites. Generally, the degree of competition, risk to pine vigour, and size of individual aspen contributing to the models declined along a gradient of decreasing ecosystem productivity.

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