Walnut twig beetle landing rates differ between host and nonhost hardwood trees under the influence of aggregation pheromone in a northern California riparian forest

2020 ◽  
Author(s):  
Crystal S. Homicz ◽  
Jackson P. Audley ◽  
Yigen Chen ◽  
Richard M. Bostock ◽  
Catherine A. Tauber ◽  
...  
Keyword(s):  
Aggregation Pheromone ◽  
Riparian Forest ◽  
Northern California ◽  
Hardwood Trees ◽  
Walnut Twig Beetle

scholarly journals A study of landing behaviour by the walnut twig beetle, Pityophthorus juglandis , among host and nonhost hardwood trees in a northern California riparian forest

2020 ◽  
Vol 22 (4) ◽  
pp. 338-348 ◽  
Author(s):  
Jackson P. Audley ◽  
Crystal S. Homicz ◽  
Richard M. Bostock ◽  
Steven J. Seybold
Keyword(s):  
Riparian Forest ◽  
Northern California ◽  
Pityophthorus Juglandis ◽  
Hardwood Trees ◽  
Walnut Twig Beetle

scholarly journals Insects collected from wood infested with Pityophthorus juglandis Blackman (Coleoptera Curculionidae Scolytinae) in the Piemonte region, Northwestern Italy

2018 ◽  
pp. 21-30 ◽  
Author(s):  
Giovanni Bosio ◽  
Crystal Cooke-McEwen
Keyword(s):  
First Record ◽  
Northern Italy ◽  
Black Walnut ◽  
Northern California ◽  
Pityophthorus Juglandis ◽  
Thousand Cankers Disease ◽  
Multiple Species ◽  
Walnut Twig Beetle ◽  
First Time ◽  
Accidental Introduction

The walnut twig beetle, Pityophthorus juglandis Blackman (Coleoptera Curculionidae Scolytinae), and thousand cankers disease are documented in the Piemonte region of Northern Italy for the first time.  Northern California is found to be the likely origin of the Piemonte walnut twig beetles based on the comparison of CO1 haplotypes. Multiple species of parasitoids have been reared from black walnut wood infested with the invasive walnut twig beetle.  These rearings constitute the first record of the genus Neocalosoter Girault and Dodd (Hymenoptera Pteromalidae Cerocephalinae) in Europe and are likely due to accidental introduction along with the host beetle. Two specimens of Theocolax spp. are described as morphological anomalies with geographical origins unknown.   

Diurnal flight response of the walnut twig beetle, Pityophthorus juglandis Blackman (Coleoptera: Scolytidae), to pheromone-baited traps in two northern California walnut habitats

2012 ◽  
Vol 88 (2) ◽  
pp. 231-247 ◽  
Author(s):  
Steven J. Seybold ◽  
Jennifer A. King ◽  
Daren R. Harris ◽  
Lori J. Nelson ◽  
Shakeeb M. Hamud ◽  
...  
Keyword(s):  
Northern California ◽  
Flight Response ◽  
Pityophthorus Juglandis ◽  
Baited Traps ◽  
Walnut Twig Beetle

scholarly journals Shade, light, and stream temperature responses to riparian thinning in second-growth redwood forests of northern California

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246822
Author(s):  
David A. Roon ◽  
Jason B. Dunham ◽  
Jeremiah D. Groom
Keyword(s):  
Elevated Temperatures ◽  
Riparian Forest ◽  
Basal Area ◽  
Stream Temperature ◽  
Water Quality Parameter ◽  
Northern California ◽  
Second Growth ◽  
Thermal Regimes ◽  
Redwood Forests ◽  
Temperature Responses

Resource managers in the Pacific Northwest (USA) actively thin second-growth forests to accelerate the development of late-successional conditions and seek to expand these restoration thinning treatments into riparian zones. Riparian forest thinning, however, may impact stream temperatures–a key water quality parameter often regulated to protect stream habitat and aquatic organisms. To better understand the effects of riparian thinning on shade, light, and stream temperature, we employed a manipulative field experiment following a replicated Before-After-Control-Impact (BACI) design in three watersheds in the redwood forests of northern California, USA. Thinning treatments were intended to reduce canopy closure or basal area within the riparian zone by up to 50% on both sides of the stream channel along a 100–200 m stream reach. We found that responses to thinning ranged widely depending on the intensity of thinning treatments. In the watersheds with more intensive treatments, thinning reduced shade, increased light, and altered stream thermal regimes in thinned and downstream reaches. Thinning shifted thermal regimes by increasing maximum temperatures, thermal variability, and the frequency and duration of elevated temperatures. These thermal responses occurred primarily during summer but also extended into spring and fall. Longitudinal profiles indicated that increases in temperature associated with thinning frequently persisted downstream, but downstream effects depended on the magnitude of upstream temperature increases. Model selection analyses indicated that local changes in shade as well as upstream thermal conditions and proximity to upstream treatments explained variation in stream temperature responses to thinning. In contrast, in the study watershed with less intensive thinning, smaller changes in shade and light resulted in minimal stream temperature responses. Collectively, our data shed new light on the stream thermal responses to riparian thinning. These results provide relevant information for managers considering thinning as a viable restoration strategy for second-growth riparian forests.

SEM Study of Tension Wood Fiber Morphology and its Effect on Paper Properties

1977 ◽  
Vol 35 ◽  
pp. 308-309
Author(s):  
K. W. Robinson
Keyword(s):  
Tension Wood ◽  
Wood Fiber ◽  
Strength Properties ◽  
Fiber Morphology ◽  
Paper Properties ◽  
Pure Cellulose ◽  
Short Rotation ◽  
Hardwood Trees ◽  
Sem Study

Tension wood (TW) is an abnormal tissue of hardwood trees; although it has been isolated from most parts of the tree, it is frequently found on the upper side of branches and leaning stems. TW has been classically associated with geotropic alignment, but more recently it has been associated with fast growth. Paper made from TW is generally lower in strength properties. Consequently, the paper industries' growing dependence on fast growing, short- rotation trees will result in higher amounts of TW in the final product and a corresponding reduction in strength.Relatively few studies have dealt with the role of TW in the structure of paper. It was suggested that the lower strength properties of TW were due to a combination of factors, namely, its unique morphology, compression failures in the cell wall, and lower hemicellulose content. Central to the unique morphology of the TW fiber is the thick gelatinous layer (G-layer) composed almost entirely of pure cellulose.

Changes of mercury concentrations in streamwater after a destructive wildfire (Camp Fire 2018) and a prescribed burning in northern California

2020 ◽  
Author(s):  
Alex Chow ◽  
Jackson Webster ◽  
Hunter Robinson ◽  
Robert rhew ◽  
Martin Tsz-Ki Tsui ◽  
...  
Keyword(s):  
Prescribed Burning ◽  
Northern California

Local Chapter Report: Northern California Society for Psychoanalytic Psychology

2003 ◽  
Author(s):  
Bart Magee ◽  
Keyword(s):  
Northern California ◽  
Local Chapter

Chapter News: Northern California Society for Psychoanalytic Psychology

1990 ◽  
Author(s):  
Kenneth J. Appel
Keyword(s):  
Northern California

Elderly Afghan refugees: Traditions and transitions in northern California

1992 ◽  
Author(s):  
Patricia A. Omidian ◽  
Juliene G. Lipson
Keyword(s):  
Northern California ◽  
Afghan Refugees
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