Disturbance and Persistence of Sitka Spruce (Picea sitchensis (Bong) Carr.) in Coastal Forests of the Pacific Northwest, North America

1990 ◽  
Vol 17 (1) ◽  
pp. 47 ◽  
Author(s):  
Alan H. Taylor
Keyword(s):  
North America ◽  
Pacific Northwest ◽  
Sitka Spruce ◽  
Picea Sitchensis ◽  
Coastal Forests ◽  
The Pacific

First Report of Powdery Mildew of Lycium chinense (Chinese Matrimony Vine) Caused by Arthrocladiella mougeotii in the Pacific Northwest

2004 ◽  
Vol 5 (1) ◽  
pp. 16
Author(s):  
Dean A. Glawe
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
Medicinal Plant ◽  
Pacific Northwest ◽  
Morphological Features ◽  
Lycium Chinense ◽  
First Report ◽  
Landscape Plant ◽  
The Pacific ◽  
Plant Grown

Chinese matrimony-vine (Lycium chinense Mill.) is a traditional medicinal plant grown in China and used as a perennial landscape plant in North America. This report documents the presence of powdery mildew on L. chinense in the Pacific Northwest and describes and illustrates morphological features of the causal agent. It appears to be the first report of a powdery mildew caused by Arthrocladiella in the Pacific Northwest. Accepted for publication 10 November 2004. Published 8 December 2004.

Sitka spruce (Picea sitchensis) in North America with special reference to its role in British forestry

1987 ◽  
Vol 93 (1-2) ◽  
pp. 1-12 ◽  
Author(s):  
L. Roche ◽  
P. G. Haddock
Keyword(s):  
Genetic Variation ◽  
North America ◽  
Special Reference ◽  
Picea Glauca ◽  
Natural Habitat ◽  
Sitka Spruce ◽  
Picea Sitchensis ◽  
Natural Distribution ◽  
Queen Charlotte Islands ◽  
Genetic Potential

SynopsisThe natural distribution of Sitka spruce is examined in relation to the species' role in British forestry. Particular attention is therefore given to a description of habitats on the Queen Charlotte Islands, and also on the adjacent mainland of British Columbia where Sitka spruce is sympatric with white spruce (Picea glauca) and hybridisation occurs. Examples of genetic variation are given and it is suggested that a knowledge of the genecologv of the species in its natural habitat would help to elucidate its full ecological and genetic potential in Britain.

Descriptors of natural thermal regimes in streams and their responsiveness to change in the Pacific Northwest of North America

2013 ◽  
Vol 58 (5) ◽  
pp. 880-894 ◽  
Author(s):  
IVAN ARISMENDI ◽  
SHERRI L. JOHNSON ◽  
JASON B. DUNHAM ◽  
ROY HAGGERTY
Keyword(s):  
North America ◽  
Pacific Northwest ◽  
The Pacific ◽  
Thermal Regimes ◽  
Responsiveness To Change

scholarly journals Temporal Asynchrony of Adult Emergence Between Leucopis argenticollis and Leucopis piniperda (Diptera: Chamaemyiidae), Predators of the Hemlock Woolly Adelgid (Hemiptera: Adelgidae), with Implications for Biological Control

2020 ◽  
Vol 49 (4) ◽  
pp. 823-828
Author(s):  
Alex N Neidermeier ◽  
Darrell W Ross ◽  
Nathan P Havill ◽  
Kimberly F Wallin
Keyword(s):  
Biological Control ◽  
North America ◽  
Pacific Northwest ◽  
Adult Emergence ◽  
Hemlock Woolly Adelgid ◽  
Adelges Tsugae ◽  
Tsuga Heterophylla ◽  
Eastern North America ◽  
Biological Control Agents ◽  
The Pacific

Abstract Two species of silver fly, Leucopis argenticollis (Zetterstedt) and Leucopis piniperda (Malloch) (Diptera: Chamaemyiidae), from the Pacific Northwest region of North America have been identified as potential biological control agents of hemlock woolly adelgid (Hemiptera: Adelgidae: Adelges tsugae Annand) in eastern North America. The two predators are collectively synchronized with A. tsugae development. To determine whether adult emergence of the two species of silver fly are also synchronized with one another, we collected adult Leucopis which emerged from A. tsugae-infested western hemlock [Pinaceae: Tsuga heterophylla (Raf.) Sarg.] from four sites in the Pacific Northwest over a 29-d period. Specimens were collected twice daily in the laboratory and identified to species using DNA barcoding. The study found that more adult Leucopis were collected in the evening than the morning. Additionally, the daily emergences of adults over the 29-d sampling period exhibited sinusoidal-like fluctuations of peak abundance of each species, lending evidence to a pattern of temporal partitioning. This pattern could have logistical implications for their use as biological control agents in eastern North America, namely the need to release both species for maximum efficacy in decreasing A. tsugae populations.

Climate-induced expansions of invasive species in the Pacific Northwest, North America: a synthesis of observations and projections

2020 ◽  
Vol 22 (7) ◽  
pp. 2163-2183
Author(s):  
Jennifer A. Gervais ◽  
Ryan Kovach ◽  
Adam Sepulveda ◽  
Robert Al-Chokhachy ◽  
J. Joseph Giersch ◽  
...  
Keyword(s):  
Invasive Species ◽  
North America ◽  
Pacific Northwest ◽  
The Pacific

The Windgrasses(AperaAdans., Poaceae) in North America

1992 ◽  
Vol 6 (2) ◽  
pp. 445-450 ◽  
Author(s):  
F. E. Northam ◽  
R. H. Callihan
Keyword(s):  
United States ◽  
North America ◽  
Pacific Northwest ◽  
Northeastern United States ◽  
Southern Ontario ◽  
Grass Seed ◽  
The Past ◽  
Winter Cereals ◽  
The Pacific ◽  
Additional Control

Two introduced windgrass species have become crop weeds in North America. Common windgrass is a major weed of winter cereals in Europe and was first documented in North America in the early 1800s. It is a weed of roadsides and waste areas in the northeastern United States and in winter grain fields of southern Ontario and Michigan. Interrupted windgrass was first reported in North America approximately 90 yr ago; it is adapted to more arid sites than common windgrass and is distributed predominantly in the northwestern U.S.A. During the past 10 to 15 yr, interrupted windgrass has adversely affected winter grain and grass seed producers in the Pacific Northwest due to additional control costs.

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