Effects of the bark beetle nematode, Contortylenchus reversus, on gallery construction, fecundity, and egg viability of the Douglas Fir beetle, Dendroctonus pseudotsugae (Coleoptera: Scolytidae)

1975 ◽  
Vol 26 (2) ◽  
pp. 235-238 ◽  
Author(s):  
Cyril H.S. Thong ◽  
John M. Webster
Keyword(s):  
Bark Beetle ◽  
Douglas Fir ◽  
Egg Viability ◽  
Dendroctonus Pseudotsugae

3-Methylcyclohex-2-en-1-one and the Douglas-fir beetle (Coleoptera: Curculionidae): history of successful bark beetle pheromone treatments

2020 ◽  
Vol 153 (1) ◽  
pp. 62-78
Author(s):  
Darrell W. Ross
Keyword(s):  
Bark Beetle ◽  
Douglas Fir ◽  
Future Research ◽  
Beetle Species ◽  
Successful Management ◽  
Dendroctonus Pseudotsugae ◽  
Successful Development ◽  
History Of ◽  
Antiaggregation Pheromone

AbstractThis paper reviews the literature on the identification of 3-methylcyclohex-2-en-1-one (MCH) as the antiaggregation pheromone of the Douglas-fir beetle (Dendroctonus pseudotsugae Hopkins) (Coleoptera: Curculionidae) and the development of successful management applications using the pheromone. Previously unpublished data from two studies on novel uses of MCH are included. The successful development of antiaggregation pheromone-based treatments for the Douglas-fir beetle is discussed in relation to efforts to develop similar treatments for other bark beetle species, and opportunities for future research on MCH and the Douglas-fir beetle are suggested.

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.

Yolk deposition in the Douglas-fir bark beetle, Dendroctonus pseudotsugae (Hopk.): the significance of physiological state of oocytes

1973 ◽  
Vol 51 (6) ◽  
pp. 659-661 ◽  
Author(s):  
T. S. Sahota ◽  
A. Ibaraki
Keyword(s):  
Juvenile Hormone ◽  
Bark Beetle ◽  
Physiological State ◽  
Douglas Fir ◽  
Dendroctonus Pseudotsugae

In vitro yolk deposition was studied in ovaries dissected out of Dendroctonus pseudotsugae at various times after attack on host logs, and incubated in medium containing a mixture of labeled haemolymph and ovarial proteins. These proteins were not deposited in the oocytes taken from beetles which had been on host logs for less than 48 h. Such proteins were deposited as yolk in the basal and penultimate oocytes from beetles which had been on host logs for more than 48 h; younger oocytes from the same ovaries did not exhibit yolk deposition. Presence of juvenile hormone in the incubating medium did not induce yolk deposition in oocytes not already engaged in vitellogenesis.

NOTES ON THE SEASONAL DEVELOPMENT OF MEDETERA ALDRICHII WHEELER (DIPTERA. DOLICHOPIDAE) AS A PREDATOR OF THE DOUGLAS FIR BARK-BEETLE, DENDROCTONUS PSEUDOTSUGAE HOPKINS (1)

1947 ◽  
Vol 79 (7-8) ◽  
pp. 150-153 ◽  
Author(s):  
George R. Hopping
Keyword(s):  
Bark Beetle ◽  
Douglas Fir ◽  
Seasonal Development ◽  
White Pine ◽  
Dendroctonus Pseudotsugae ◽  
Western Larch ◽  
Field Station ◽  
Additional Information ◽  
Red Cedar ◽  
Western White Pine

In 1935, De Leon published a comprehensive paper on Medetera aldrichii as a predator ol Dendroctonus monticolae Hopk., in western white pine and lodgepole pine in Washington. The following data may prove of value because a different species of bark-beetle is involved and additional information is given. The observations were made in 1941 and 1942 at the Trinity Valley Forest Insect Field Station, 22 miles from Vernon. This locality is 2,100 feet above sea level in a mixed timber stand of western larch, Douglas fir, western red cedar, Engelmann spruce, western hemlock, and western white pine. D. pseudotsugae breeds in Douglas fir, and occasionally in western larch.

APPARENT NEGATIVE GEOTROPISM IN THE DOUGLAS FIR BARK BEETLE

1942 ◽  
Vol 74 (11) ◽  
pp. 205-205 ◽  
Author(s):  
George R. Hopping
Keyword(s):  
Bark Beetle ◽  
Douglas Fir

Dendroctonus pseudotsugae. [Distribution map].

2004 ◽  
Author(s):  
Keyword(s):  
British Columbia ◽  
New Mexico ◽  
North America ◽  
Geographical Distribution ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Distribution Map ◽  
Dendroctonus Pseudotsugae ◽  
New Distribution

Abstract A new distribution map is provided for Dendroctonus pseudotsugae Hopkins Coleoptera: Scolytidae Hosts: Mainly Douglas fir (Pseudotsuga menziesii), also other Pseudotsuga spp. Information is given on the geographical distribution in NORTH AMERICA, Canada, Alberta, British Columbia, Mexico, USA, Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Texas, Utah, Washington, Wyoming.

Influence of recent bark beetle outbreak on fire severity and postfire tree regeneration in montane Douglas-fir forests

Ecology ◽  
2013 ◽  
Vol 94 (11) ◽  
pp. 2475-2486 ◽  
Author(s):  
Brian J. Harvey ◽  
Daniel C. Donato ◽  
William H. Romme ◽  
Monica G. Turner
Keyword(s):  
Bark Beetle ◽  
Fire Severity ◽  
Douglas Fir ◽  
Tree Regeneration

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.

Studies on Nervous System Anatomy of the Douglas Fir Beetle, Dendroctonus pseudotsugae Hopk. (Scolytidae)

1957 ◽  
Vol 89 (2) ◽  
pp. 80-86 ◽  
Author(s):  
M. D. Atkins ◽  
J. A. Chapman
Keyword(s):  
Nervous System ◽  
Comparative Studies ◽  
Douglas Fir ◽  
Dendroctonus Pseudotsugae ◽  
Anatomical Features

This paper describes the main anatomical features of the adult nervous system of the Douglas fir beetle, Dendroctonus pseudotsugae Hopk. The study on which it is based was carried out to provide a background for further work on the nervous system and as part of a program of investigation of the physiology and behaviour of scolytid beetles.Extensive comparative studies of coleopterous nervous system were made long ago by Blanchard (1846) and Brand (1879). Their descriptions of scolytid material are sketchy and brief, however, and because we can find no other treatment of the nervous system in the Scolytidae we are presenting this brief report on our work.

A Biodegradable Formulation of MCH (3-Methylcyclohex-2-en-1-one) for Protecting Pseudotsuga menziesii from Dendroctonus pseudotsugae (Coleoptera: Curculionidae) Colonization

2020 ◽  
Vol 113 (4) ◽  
pp. 1858-1863 ◽  
Author(s):  
Gabriel G Foote ◽  
Christopher J Fettig ◽  
Darrell W Ross ◽  
Justin B Runyon ◽  
Tom W Coleman ◽  
...  
Keyword(s):  
New Mexico ◽  
Pseudotsuga Menziesii ◽  
Tree Mortality ◽  
Douglas Fir ◽  
Dendroctonus Pseudotsugae ◽  
Individual Tree ◽  
Significant Difference ◽  
Antiaggregation Pheromone ◽  
Individual Trees

Abstract Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, trees and stands can be protected from Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (DFB)-caused mortality by application of synthetic formulations of the beetle’s antiaggregation pheromone, 3-methylcyclohex-2-en-1-one (MCH). A biodegradable formulation of MCH, SPLAT MCH, was developed and evaluated for protecting individual Douglas-fir trees and small stands from colonization and mortality by DFB. In an individual-tree experiment in Idaho, both MCH bubble capsules and SPLAT MCH significantly reduced the proportion of treated trees colonized and killed by DFB compared to untreated controls. SPLAT MCH was as effective as MCH bubble capsules for protecting individual trees. Both MCH bubble capsules and SPLAT MCH significantly reduced the proportion of trees colonized and killed by DFB within 0.04-ha circular plots surrounding each treated tree compared to untreated controls. In 0.41 ha stands in New Mexico, both MCH bubble capsules and SPLAT MCH significantly reduced the proportion of trees colonized and killed by DFB compared to untreated controls, again with no differences observed between MCH treatments. In a similar stand level trial in Idaho, neither MCH treatment significantly reduced the proportion of trees colonized by DFB, and only MCH bubble capsules significantly reduced levels of tree mortality compared to untreated controls, but no significant difference was observed between SPLAT MCH and MCH bubble capsules. Overall, the results indicate that SPLAT MCH is as effective as MCH bubble capsules for protecting individual trees and small stands of Douglas-fir from DFB-caused mortality.

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