White Spruce Seed Dispersal in Central British Columbia

1976 ◽  
Vol 52 (5) ◽  
pp. 225-228 ◽  
Author(s):  
R. C. Dobbs
Keyword(s):  
British Columbia ◽  
Seed Dispersal ◽  
Picea Glauca ◽  
White Spruce ◽  
Seed Density ◽  
Wide Strip

Seed dispersal of white spruce (Picea glauca) (Moench) Voss) from stands bordering a large clearcut and a strip cut was studied. Seedfall fell sharply with distance from the clearcut edge to 100 m, but even at 300 m the average dispersed seed density exceeded 740 000 seeds/ha or 3% of that recorded within the stand. Dispersed seed density in the middle of the 200-metre-wide strip cut exceeded 1 300 000 seeds/ha or 20% of that recorded within the bordering stands. About one-third of the seeds was disseminated by the end of September.

Pucciniastrum americanum. [Descriptions of Fungi and Bacteria].

1969 ◽  
Author(s):  
G. F. Laundon
Keyword(s):  
New York ◽  
British Columbia ◽  
Life Cycle ◽  
Nova Scotia ◽  
Leaf Rust ◽  
Geographical Distribution ◽  
Picea Glauca ◽  
Yellow Rust ◽  
White Spruce ◽  
Rubus Idaeus

Abstract A description is provided for Pucciniastrum americanum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Pycnia and aecia on Picea glauca (=P. canadensis), uredia and telia on Rubus idaeus (incl. R. strigosus) and R. leucodermis (raspberries). DISEASE: Needle rust of white spruce. Late leaf rust or late yellow rust of raspberry, infecting canes, leaves, petioles, calyces and fruits. GEOGRAPHICAL DISTRIBUTION: Canada and U.S.A. (widely distributed, recorded from British Columbia, Connecticut, Idaho, Illinois, Iowa, Mass., Md, Me, Montana, North Dakota, New Hamp., New Jersey, Nova Scotia, New York, Ohio, Ontario, Quebec, Vermont, Wisconsin, West Virginia). TRANSMISSION: Although the basidiospores infect Picea glauca (white spruce) (Darker, 1929) in some areas they probably play little part in the life cycle on raspberry since this rust is found on the latter host year after year in regions remote from any spruce trees (Anderson, 1956).

Parental environment aftereffects on germination, growth, and adaptive traits in selected white spruce families

1998 ◽  
Vol 28 (3) ◽  
pp. 418-426 ◽  
Author(s):  
Michael U Stoehr ◽  
Sylvia J L'Hirondelle ◽  
Wolfgang D Binder ◽  
Joe E Webber
Keyword(s):  
British Columbia ◽  
Seed Development ◽  
Picea Glauca ◽  
White Spruce ◽  
Seed Orchard ◽  
Field Season ◽  
Germination Traits ◽  
Reproductive Processes ◽  
Progeny Performance ◽  
Needle Primordia

Seed orchards for the production of conifer seed in British Columbia are usually located in areas favorable (warm and dry) for flowering and seed development, often considerably south of the source location of the parent trees. Differences in environmental conditions between seed orchard location and location of origin can affect progeny performance. It is suspected that this is caused by environmental factors that affect reproductive processes of parent trees and lead to altered physiological traits (aftereffects). This study examined if aftereffects are present in white spruce (Picea glauca (Moench) Voss). Control pollinations were made at two locations, Red Rock, near Prince George (53°N) in central British Columbia, and Kalamalka, near Vernon (50°N) in southern British Columbia, on five female trees using a four-male polymix. Identical genotypes through grafting were present at the two locations. Pollen maturing at each site was only used in the polymix at that particular location. Progeny were raised and germination traits, number of needle primordia, greenhouse and field heights, and frost hardiness were evaluated in a common environment. The location of seed development significantly affected all traits evaluated. Height growth aftereffects in the second field season were much less than those observed in the first field season. These results suggest that aftereffects are detectable in white spruce progeny performance in British Columbia.

Predicting defoliation by Choristoneura biennis (Lepidoptera: Tortricidae)

2003 ◽  
Vol 135 (6) ◽  
pp. 903-907 ◽  
Author(s):  
V.G. Nealis ◽  
R. Turnquist
Keyword(s):  
British Columbia ◽  
Life Cycle ◽  
Linear Regression ◽  
Picea Glauca ◽  
Spruce Budworm ◽  
White Spruce ◽  
Prediction Intervals ◽  
Abies Lasiocarpa ◽  
Independent Data ◽  
Subalpine Fir

AbstractThe 2-year-cycle spruce budworm, Choristoneura biennis Free. (Lepidoptera: Tortricidae), causes defoliation of spruce – subalpine fir forests in British Columbia, Canada. Historical and newly obtained data were used to develop a linear regression relating percent defoliation in the 2nd feeding year of the life cycle to the percentage of shoots damaged in the previous, 1st feeding year of the life cycle. The resulting regression was tested with independent data and correctly predicted (95% prediction intervals) defoliation in 14 of 15 stands. Patterns of defoliation were similar on white spruce, Picea glauca (Moench) Voss (Pinaceae), and subalpine fir, Abies lasiocarpa (Hook.) Nutt. (Pinaceae), and hence the regression can be used for either mixed or pure stands of either species.

SPRUCE CONE INSECTS IN BRITISH COLUMBIA AND THEIR CONTROL

1973 ◽  
Vol 105 (1) ◽  
pp. 113-122 ◽  
Author(s):  
A. F. Hedlin
Keyword(s):  
British Columbia ◽  
Picea Glauca ◽  
Black Spruce ◽  
Gall Midge ◽  
White Spruce ◽  
Important Species ◽  
Systemic Insecticides ◽  
Engelmann Spruce ◽  
Cone Axis ◽  
Considerable Loss

AbstractInsects cause considerable loss of seed in white spruce, Picea glauca (Moench) Voss, and Engelmann spruce, P. engelmannii Parry, in British Columbia. The most important species are a maggot, Hylemya anthracina (Cz.), and a seed moth, Laspeyresia youngana (Kit.). Other insects are: a seed chalcid, Megastigmus piceae Roh., a cone axis midge, Dasineura rachiphaga Tripp, a gall midge, D. canadensis Felt, a seed midge, Mayetiola carpophaga Tripp, and a scale-feeding midge. These insects also occur in cones of Sitka spruce, P. sitchensis (Bong.) Carr., and black spruce, P. mariana (Mill.) BSP.The systemic insecticides dimethoate and formothion proved to be effective against these insects when applied as sprays following pollination in mid-June.

BUILD-UP OF PULLULARIA PULLULANS (deBary) BERKHOUT WITHIN A SEVERE SPRUCE BUDWORM INFESTATION AT BABINE LAKE, BRITISH COLUMBIA

1959 ◽  
Vol 35 (3) ◽  
pp. 227-231 ◽  
Author(s):  
A. C. Molnar ◽  
G. T. Silver
Keyword(s):  
British Columbia ◽  
Picea Glauca ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
White Spruce

A report of bud necrosis of white spruce, Picea glauca (Moench) Voss, within spruce budworm, Choristoneura fumiferana (Clem.), infested stands was investigated. No significant differences in bud mortality could be determined between infested and non-infested stands, but a nine-fold higher incidence of Pullularia pullulans (deBary) Berkhout was measured in infested stands. This later finding suggested a marked build-up of the fungus as a result of conditions created by the budworm infestation.

Twenty year responses of white spruce to mechanical site preparation and early chemical release in the boreal region of northeastern British Columbia

2006 ◽  
Vol 36 (10) ◽  
pp. 2386-2399 ◽  
Author(s):  
Jacob O Boateng ◽  
Jean L Heineman ◽  
John McClarnon ◽  
Lorne Bedford
Keyword(s):  
British Columbia ◽  
Picea Glauca ◽  
Basal Area ◽  
White Spruce ◽  
Site Preparation ◽  
Mechanical Site Preparation ◽  
Chemical Release ◽  
Early Results ◽  
Stock Type ◽  
Survival And Growth

The effects of six mechanical site preparation treatments, two stock-type treatments, and early chemical release on survival and growth of planted white spruce (Picea glauca (Moench) Voss) were studied in the BWBSmw1 biogeoclimatic zone of northeastern British Columbia. After 20 years, spruce height and diameter were larger in all mounding treatments than in the control. Early results suggested better spruce performance on large than small mounds, but after 20 years, growth was equally good on small mounds as on mounds with 20 cm mineral capping. Spruce planted on hinge positions in the Bräcke patch and blade scarification treatments did not survive or grow well. Early chemical release improved spruce growth equally as well as the mounding treatments. Twenty year spruce survival averaged 71% in the 14 and 20 cm mound treatments, 60% in the early chemical release treatment, and ≤35% in the Bräcke patch and blade scarification treatments. A large stock type was also planted in untreated ground and, after 20 years, had similar survival and growth as the standard stock type. Differences in survival had a large effect on basal area at age 20 years. Trend analysis showed that treatments diverged into two distinct groups with regard to spruce size during the 20 year span of the study.

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