ATTACK BY GNATHOTRICHUS SULCATUS (COLEOPTERA: SCOLYTIDAE) ON STUMPS AND FELLED TREES BAITED WITH SULCATOL AND ETHANOL

1977 ◽  
Vol 109 (5) ◽  
pp. 675-686 ◽  
Author(s):  
J. A. McLean ◽  
J. H. Borden
Keyword(s):  
Bark Beetles ◽  
Douglas Fir ◽  
Western Hemlock ◽  
Systemic Insecticide ◽  
Dendroctonus Pseudotsugae ◽  
University Of British Columbia ◽  
Steady Decrease ◽  
Population Aggregation ◽  
The University

AbstractEthanol and sulcatol (6-methyl-5-hepten-2-ol), primary attractant and population aggregation pheromone, respectively, for Gnathotrichus sulcatus, were deployed alone or in combination on stumps and felled trees in the University of British Columbia Research Forest, Maple Ridge, B.C. On 18 April 1974, four Douglas-fir trees were felled at each of three locations, and four western hemlock trees were felled at each of three other locations. Felled trees and their respective stumps were baited on 26 April. Attacks by G. sulcatus and bark beetles were recorded at weekly intervals until 25 October. G. sulcatus attacks increased rapidly, reaching a maximum in June and July, followed by a steady decrease to October. Attacks by Dendroctonus pseudotsugae, Pseudohylesinus nebulosus, and P. tsugae showed characteristic seasonal trends, but were not correlated to any of the treatments. Over half the G. sulcatus attacks were on stumps, in which attack densities reached 683.5/m2. The greatest numbers of attacks were on stumps and logs baited with sulcatol or sulcatol plus ethanol. There was a significant interaction between sulcatol and ethanol on Douglas-fir but not on western hemlock. Significantly more G. sulcatus attacked ethanol-baited western hemlock stumps and logs than unbaited controls. However, there was no difference between the level of attack on ethanol-baited Douglas-fir and the controls. The role of ethanol is hypothesized to be more of a boring stimulant than a major attractant. Stumps baited with sulcatol and then treated with ethanolic solutions of systemic insecticide could be used to trap and kill field populations, thus reducing numbers of G. sulcatus being transported to log-booming grounds, dryland sorting areas, and sawmills.

Marking forest insects: evaluation of two systems for the systemic introduction of rubidium into Douglas-fir trees

1988 ◽  
Vol 18 (1) ◽  
pp. 19-23 ◽  
Author(s):  
J.A. McLean ◽  
J. Tuytel
Keyword(s):  
British Columbia ◽  
Bark Beetles ◽  
Douglas Fir ◽  
Phloem Tissue ◽  
Double Ring ◽  
University Of British Columbia ◽  
Forest Insects ◽  
Single Ring ◽  
Two Systems ◽  
The University

Mauget® and Medicap® systems were evaluated for the systemic introduction of RbCl into Douglas-fir trees in the University of British Columbia Research Forest, Maple Ridge, B.C. Single, double, and triple rings of devices were placed on trees and Rb levels in foliage were monitored every 2 weeks for 8 weeks. At 8 weeks, trees were felled and phloem and sapwood samples were collected. Wounding associated with the injection devices was evaluated. Triple ring Mauget® injectors gave best results with more than 1890 ppm Rb in leader foliage. Rb levels were evenly distributed by height and aspect throughout the study trees. Highest levels of Rb were found in phloem tissue and these were often 3 times those in adjacent sapwood. Greater wounding, measured by failure to lay down current year springwood, was associated with the Medicap® implants. Some of this was probably caused by our failure to fully insert and thereby seal the implants properly in the tree, and a second factor may have been Rb toxicity as the capsule and RbCl crystals dissolved. A single ring of Mauget® injectors and a double ring of Medicaps® resulted in foliar Rb concentrations high enough for labelling of defoliating insects. High phloem levels of Rb suggest that bark beetles feeding on these trees would also be well labelled.

Failure of ovarian development in the Douglas-fir bark beetle, Dendroctonus pseudotsugae; an analysis of gut proteases and female-specific proteins

1971 ◽  
Vol 49 (7) ◽  
pp. 1021-1024 ◽  
Author(s):  
T. S. Sahota
Keyword(s):  
High Activity ◽  
Bark Beetle ◽  
Methyl Ether ◽  
Bark Beetles ◽  
Ovarian Development ◽  
Proteolytic Enzymes ◽  
Douglas Fir ◽  
Dendroctonus Pseudotsugae ◽  
Specific Proteins ◽  
Female Specific

The failure of ovarian development in Douglas-fir bark beetles denied of their natural gallery environment and maintained on host bark chips was investigated. Such insects possessed a high activity of proteolytic enzymes in their guts but relatively small amounts of female-specific proteins both in haemolymph and the oocytes. Topical application of farnesyl methyl ether did not increase the activity of gut proteases but resulted in increased amounts of female-specific proteins in haemolymph and ovaries. Thus it appears that the Douglas-fir bark beetles maintained on bark chips do not suffer from an inability to break down the ingested proteins, but synthesize and transfer less than normal amounts of female-specific proteins to the developing oocytes.

The Life History and Habits of Scolytus unispinosus Leconte (Coleoptera: Scolytidae) in the Interior of British Columbia

1962 ◽  
Vol 94 (1) ◽  
pp. 17-25 ◽  
Author(s):  
L. H. McMullen ◽  
M. D. Atkins
Keyword(s):  
British Columbia ◽  
Bark Beetles ◽  
Pacific Coast ◽  
Rocky Mountain ◽  
Economic Importance ◽  
Douglas Fir ◽  
Dendroctonus Pseudotsugae ◽  
Rocky Mountain Region ◽  
The Pacific ◽  
Standing Timber

The Douglas-fir engraver, Scolytus unispinosus Leconte, is a common bark beetle throughout the Pacific Coast and Rocky Mountain Region of North America. Although it occasionally kills young trees (Chamberlin, 1939), it is of minor economic importance, usually confining its attack to tops, limbs and logging slash. In standing timber it acts primarily as a secondary insect, attacking the tops and branches of trees killed or severely weakened by other agents. In the interior of British Columbia it is commonly found in Douglas fir, Pseudotsuga menziesii (Mirb.) Franco, and thus it is of interest as an associate of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk. Two other bark beetles Pseudohylesinus nebulosus (Leconte) and Scolytus tsugae (Swaine) with similar associations were studied earlier (Walters and McMullen, 1956; McMullen and Atkins, 1959).

On the Flight and Host Selection of the Douglas-fir Beetle, Dendroctonus pseudotsugae Hopk. (Coleoptera: Scolytidae)

1962 ◽  
Vol 94 (12) ◽  
pp. 1309-1325 ◽  
Author(s):  
L. H. McMullen ◽  
M. D. Atkins
Keyword(s):  
Experimental Data ◽  
Life Cycle ◽  
Host Selection ◽  
Bark Beetles ◽  
Time Of Flight ◽  
Field Studies ◽  
Douglas Fir ◽  
Major Portion ◽  
Dendroctonus Pseudotsugae ◽  
Selection Of

The flight of bark beetles covers a short but important period of their life cycle, during which they are exposed to conditions not encountered during the major portion of their life under the bark. The time of flight and the factors which affect it are important, not only to the dispersal and survival of the insect, but also in the interpretation of experimental data dependent upon the beetle's flight activity.Chapman (1954), Rudinsky and Vité (1956), and Atkins (1959, 1960, 1961) studied the flight of the Douglas-fir beetle under laboratory conditions, but there is scant reference to field studies on the flight of this insect. Chapman and Kinghorn (1958) recorded the number caught in window flight traps near Cowichan Lake, B.C., and unpublished reports describe emergence records obtained from cage studies conducted near Lumby, B.C.

An examination of regional, provenance, and family variation in cold hardiness of Pinusmonticola

1992 ◽  
Vol 22 (12) ◽  
pp. 1917-1921 ◽  
Author(s):  
Barbara R. Thomas ◽  
Donald T. Lester
Keyword(s):  
British Columbia ◽  
Cold Hardiness ◽  
Regional Difference ◽  
Coastal Region ◽  
White Pine ◽  
Seed Transfer ◽  
University Of British Columbia ◽  
Western White Pine ◽  
The University

Seedlings from 29 seed lots of western white pine (Pinusmonticola Dougl. ex D. Don) from the British Columbia coast and interior ranges were tested for frost hardiness. Detached needles were exposed to a series of freezing temperatures, and relative hardiness was calculated based on visual scoring of injury. Seasonal progress in hardening was tested in seedlings maintained at the University of British Columbia (coastal) nursery. In addition, the same seed lots grown at a coastal and an interior field plantation were tested once during the hardening process. There was a significant (p = 0.04) regional difference between the coast and interior sources. The coastal region showed approximately 20% more damage than the interior region. Whereas provenances within a region did not differ in cold hardiness, families within a provenance did vary in this respect. The results suggest that the role of phenotypic plasticity in cold hardiness of P. monticola is reduced relative to other traits. It is recommended that seed transfer be restricted to within coastal and interior regions and that collections be bulked within a region.

Heritage Inc.: A Mini-Symposium on Heritage Protection and Private Actors. Held at the Faculty of Law, University of British Columbia, Vancouver, Canada, 16 March 2012

2012 ◽  
Vol 19 (4) ◽  
pp. 549-571
Author(s):  
Robert K. Paterson ◽  
Anastasia Telesetsky
Keyword(s):  
British Columbia ◽  
Pacific Northwest ◽  
Financial Support ◽  
University Of British Columbia ◽  
The Pacific ◽  
Canadian Studies ◽  
Heritage Protection ◽  
Private Actors ◽  
The University

In response to the emerging phenomenon of the role of nonstate actors in heritage protection and preservation, a one-day symposium took place on 16 March 2012 in the new Allard Hall building of the Faculty of Law at the University of British Columbia in Vancouver, Canada. The conference was officially opened by Dean of Law, Professor Mary Anne Bobinski and received financial support from the University of British Columbia, Faculty of Law Conference Fund; the Pacific Northwest Canadian Studies Consortium; and Golder Associates Ltd. The conference brought together seven experts from both academia and practice to discuss contemporary practices and emerging legal and sociological trends in heritage protection by private actors.

ATTRACTION AND REPRESSION OF DENDROCTONUS PSEUDOTSUGAE (COLEOPTERA: SCOLYTIDAE) BY THREE SYNTHETIC PHEROMONES IN TRAPS IN OREGON AND IDAHO

1972 ◽  
Vol 104 (6) ◽  
pp. 815-822 ◽  
Author(s):  
J. A. Rudinsky ◽  
M. M. Furniss ◽  
L. N. Kline ◽  
R. F. Schmitz
Keyword(s):  
Bark Beetles ◽  
Douglas Fir ◽  
New Method ◽  
Host Volatiles ◽  
Dendroctonus Pseudotsugae ◽  
Sticky Traps ◽  
Comparative Tests ◽  
Host Attractants ◽  
Alpha Pinene ◽  
Made In

AbstractComparative tests were made in Oregon and Idaho employing sticky traps with three synthetic pheromones of Dendroctonus pseudotsugae Hopkins, frontalin, 3-methyl-2-cyclohexen-1-one, and trans-verbenol, and the host attractants Douglas-fir resin, alpha-pinene, and camphene. The attractiveness of frontalin combined with host volatiles reported earlier from Idaho was confirmed. The combination of trans-verbenol with frontalin plus camphene in Oregon brought the highest response among synthetic treatments, but the addition of trans-verbenol to other treatments with frontalin sometimes decreased beetle response.3-Methyl-2-cyclohexen-1-one almost nullified the attractiveness of all baits tested. The practical use of such a compound to prevent beetle aggregation and protect susceptible Douglas-fir trees as well as to regulate the "spillover" from attractive baits is considered as a possible new method of protection against bark beetles.

scholarly journals THE RELATIVE EFFICIENCY OF THREE HARE-REPELLENTS IN PROTECTING DOUGLAS-FIR SEEDLINGS

1961 ◽  
Vol 37 (1) ◽  
pp. 22-28 ◽  
Author(s):  
J. Walters ◽  
J. Soos
Keyword(s):  
British Columbia ◽  
Relative Efficiency ◽  
Douglas Fir ◽  
University Of British Columbia ◽  
The University ◽  
Extensive Damage

Damage to plantations by animals is often serious. In the Douglas-fir region, damage by hares is particularly severe. Following extensive damage to Douglas-fir plantations on the University of British Columbia Research Forest, Haney, B.C., by varying hares, three repellents were tested. This paper describes the nature of the damage and assesses the relative efficiency of repellents tested in terms of the protection afforded to treated seedlings.

ABUNDANCE OF THE FIR ENGRAVER, SCOLYTUS VENTRALIS, AND THE DOUGLAS-FIR BEETLE, DENDROCTONUS PSEUDOTSUGAE, FOLLOWING TREE DEFOLIATION BY THE DOUGLAS-FIR TUSSOCK MOTH, ORGYIA PSEUDOTSUGATA

1984 ◽  
Vol 116 (3) ◽  
pp. 293-305 ◽  
Author(s):  
L. C. Wright ◽  
A. A. Berryman ◽  
B. E. Wickman
Keyword(s):  
Bark Beetles ◽  
Female Parent ◽  
Douglas Fir ◽  
Mortality Factors ◽  
Dendroctonus Pseudotsugae ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata ◽  
Tree Defoliation ◽  
Key Factor ◽  
Adult Dispersal

AbstractFir engraver and Douglas-fir beetle numbers were monitored during and after an outbreak of the Douglas-fir tussock moth. The population behavior of the two species of bark beetles was similar. Number of emerged offspring/female was highest during the years of defoliation and declined afterward. Total number of beetle attacks peaked 1 to 2 years after defoliation ended and then declined. During and 1 year after defoliation, beetles generally infested trees that had greater than 90% defoliation. After this time infestations were not as strongly associated with heavily defoliated trees. Life tables were constructed for beetles within trees and for beetles per area of forest land. Key mortality factors acting on beetles within trees occurred during the larval and pupal stages. Mortality during adult dispersal was a key factor when beetle density per area of land was considered. Although beetle offspring emerging per dm2 of bark surface was relatively low in defoliated trees, defoliation appeared to reduce host resistance which enabled beetles to successfully attack at lower densities, reducing intraspecific competition, and resulting in increased emergence of offspring/female parent.

scholarly journals Read the world to write the future: An interview with professors E Wayne Ross and Xosé Manuel Souto, experts in critical social studies

2021 ◽  
Vol 14 (2) ◽  
pp. e974
Author(s):  
Jordi Castellví Mata
Keyword(s):  
Social Studies ◽  
Educational Innovation ◽  
The Past ◽  
University Of British Columbia ◽  
The World ◽  
The Face ◽  
Curricular Material ◽  
Institutional Contexts ◽  
The University

E Wayne Ross is professor at the University of British Columbia (Canada). He is interested in the influence of social and institutional contexts on teachers’ practice as well as the role of curriculum and teaching in building a democratic society in the face of antidemocratic impulses of greed, individualism, and intolerance. Xosé Manuel Souto is professor at the University of Valencia (Spain), in the department of social and experimental sciences education. He directs the Gea-Clío educational innovation group that has developed, for the past thirty years, its work in the fields of teacher training, creation of curricular material and educational research.

Sign in / Sign up

Export Citation Format

Share Document