Susceptibility of lodgepole pine provenances to geographically separate western gall rust spore sources

1988 ◽  
Vol 18 (9) ◽  
pp. 1203-1205 ◽  
Author(s):  
B. J. van der Kamp
Keyword(s):  
British Columbia ◽  
Factorial Design ◽  
Significant Interaction ◽  
Lodgepole Pine ◽  
East West

Seven lodgepole pine (Pinusconforta Dougl.) provenances collected along an east–west transect from the Cypress Hills, Saskatchewan, to Vancouver, British Columbia, were inoculated as 1-year-old seedlings with one coastal and three British Columbia interior western gall rust (Endocronartiumharknessii (J.P. Moore) Y. Hiratsuka) spore sources in a factorial design. Infection levels ranged from 4 to 95% (average 56.4%, based on 1032 inoculated seedlings). ANOVA of arc sine transformed percent seedlings infected demonstrated a significant interaction between provenance and spore source (P = 0.029). Provenance, spore source, and their interaction accounted for 70, 14, and 6% of the variation, respectively.

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.

Anthracoidea buxbaumii. [Descriptions of Fungi and Bacteria].

2010 ◽  
Author(s):  
C. M. Denchev
Keyword(s):  
British Columbia ◽  
Geographical Distribution ◽  
Conservation Status ◽  
Far East ◽  
West Siberia ◽  
Severe Damage ◽  
East West

Abstract A description is provided for Anthracoidea buxbaumii, which sometimes causes severe damage to Carex sp. Some information on its morphology, dispersal and transmission and conservation status are given, along with details of its geographical distribution (Canada (Alberta, British Columbia, Newfoundland, Ontario, Quebec), USA (Alaska), Japan, Russia (Far East, West Siberia), Estonia, Finland, Lithuania, Norway, Poland, Romania, Slovakia and Sweden) and hosts (C. adelostoma, C. buxbaumii subsp. alpina, C. buxbaumii, C. gmelinii, C. hartmanii and C. tarumensis).

scholarly journals Fungal colonizers and seed loss in lodgepole pine orchards of British Columbia

Botany ◽  
2019 ◽  
Vol 97 (1) ◽  
pp. 23-33
Author(s):  
Paul Y. de la Bastide ◽  
Jonathon LeBlanc ◽  
Lisheng Kong ◽  
Terrie Finston ◽  
Emily M. May ◽  
...  
Keyword(s):  
British Columbia ◽  
Seed Production ◽  
Pinus Contorta ◽  
Lodgepole Pine ◽  
Seed Viability ◽  
Molecular Approaches ◽  
Seed Loss ◽  
Natural Range ◽  
Fungal Microbiome ◽  
Host Tissues

Lodgepole pine (Pinus contorta var. latifolia Engelm. ex S. Watson) is an important lumber species in Canada, and seed orchards are expected to meet the increased demand for seed. However, seed production has been consistently low in the Okanagan region orchards of British Columbia, Canada. To determine whether the fungal microbiome contributes to seed loss, histological and molecular approaches were used. Seed production was studied at seven Okanagan orchards, all outside the natural range of lodgepole pine, and at one near Prince George, within its natural range. Seed losses were highest in the Okanagan, compared with Prince George. The role of fungal colonizers in consuming seed during the last stages of maturation is described. Fungal hyphae were frequently observed at all locations in developing seed, particularly once storage substances accumulated. Fungi identified from host tissues using molecular and morphological techniques included Alternaria, Cladosporium, Fusarium, Penicillium, and Sydowia. The opportunistic foliar pathogen Sydowia polyspora, which is known to have a variable biotrophic status, was detected at most orchards within different host tissues (seeds, needles, and conelets), in association with pollen, and in the air column. Reduced seed viability observed in Okanagan orchards is most likely due to a combination of factors, including composition of the fungal microbiome.

Impact on Simulated Jurors of Testimony as a Function of Non-Evidential Characteristics of Witness and Defendant

1980 ◽  
Vol 46 (2) ◽  
pp. 343-348 ◽  
Author(s):  
Victor M. Catano
Keyword(s):  
Decision Making ◽  
Factorial Design ◽  
Significant Interaction ◽  
Relevant Research ◽  
Dependent Variables ◽  
The Impact

The impact on jurors' decision making of the non-evidential characteristics of witnesses' and defendant's attractiveness and the agreement of their testimony was explored in a 2 × 2 × 2 between-subjects factorial design. 48 undergraduates read a summary of a courtroom trial in which an eyewitness, who was either a professional (High Attractive) or laborer (Low Attractive), either agreed or disagreed with the testimony of a defendant whose character had been assessed positively (High Attractive) or negatively (Low Attractive). Dependent variables were subjects' verdicts and confidence in the witnesses' and defendant's testimony. Conflict in testimony between the witness and defendant led to higher ratings of guilt but lowered the subject's confidence in the testimony of both. A significant interaction of witness × defendant × testimony showed that ratings of guilt decreased when a witness testified against a defendant who was dissimilar in attractiveness; an unattractive witness supporting an attractive defendant also reduced assessment of guilt but an attractive witness who testified for an unattractive defendant increased findings of guilt. Results were discussed in the context of relevant research involving simulated jurors.

Regeneration and growth of lodgepole pine in small openings in the Alberta Foothills

1987 ◽  
Vol 17 (7) ◽  
pp. 758-759 ◽  
Author(s):  
P. Y. Bernier
Keyword(s):  
Lodgepole Pine ◽  
Clear Cut ◽  
East West

A survey carried out in 13-year-old circular openings of 1, 2, 4, and 6 tree heights (H) in diameter, in a 1H east–west strip, and in a 20-ha clear-cut of similar ages shows that regeneration of lodgepole pine (Pinuscontorta Dougl. var. latifolia Engelm.) in the 4H and 6H cuts is comparable with that of the larger clear-cut. Regeneration is poor in the 2H opening and nonexistent in the 1H circular openings. The 1H east–west strip shows good regeneration.

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