HOST EFFECTS ON ALLOZYME AND MORPHOLOGICAL VARIATION OF THE MOUNTAIN PINE BEETLE, DENDROCTONUS PONDEROSAE HOPKINS (COLEOPTERA: SCOLYTIDAE)

1991 ◽  
Vol 123 (2) ◽  
pp. 395-410 ◽  
Author(s):  
David W. Langor ◽  
John R. Spence
Keyword(s):  
Genetic Differentiation ◽  
Morphological Variation ◽  
Host Species ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Limber Pine ◽  
Mountain Pine ◽  
Pine Beetle ◽  
A Site

AbstractAllozyme and morphological variation were investigated for mountain pine beetle populations in limber pine and lodgepole pine in Alberta and British Columbia. Fourteen gene loci, five of which were polymorphic, were studied. Heterozygote deficiencies were detected at the ME locus for 13 of the 16 groups of beetles sampled. Selection against heterozygotes appears to be the most plausible explanation. There was no significant difference in heterozygosity between beetles from lodgepole pine and those from limber pine. Relatively high levels of genetic differentiation, in terms of allele frequency, were observed among beetles from different sites, host species, seasons, and individual conspecific trees within a site. Low levels of differentiation were observed between beetle generations at a site and between sexes. We attribute significant host-associated genetic differentiation to differential survival in hosts rather than to differential host preference of beetle genotypes. Standardized discriminant function analysis of 12 morphological characters indicated significant differences in beetle shape between sexes, host species, and among sites. Overall, there was little evidence of preferential host selection by beetles which would imply substructuring of Dendroctonus ponderosae Hopkins populations along host lines.

EGG GALLERY, BROOD PRODUCTION, AND ADULT CHARACTERISTICS OF MOUNTAIN PINE BEETLE, DENDROCTONUS PONDEROSAE HOPKINS (COLEOPTERA: SCOLYTIDAE), IN THREE PINE HOSTS

1995 ◽  
Vol 127 (6) ◽  
pp. 955-965 ◽  
Author(s):  
H.F. Cerezke
Keyword(s):  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Jack Pine ◽  
Brood Production ◽  
East Central ◽  
Limber Pine ◽  
Mountain Pine ◽  
Pine Beetle ◽  
Jack Pine Forests

AbstractDuring the 1977–1986 outbreak of mountain pine beetle (Dendroctonus ponderosae) in southwestern Alberta and Saskatchewan, populations of this beetle developed in lodgepole pine and limber pine stands, and threatened to spread northeasterly to the extensive jack pine forests in the central parts of the two provinces. To assess jack pine as a potential new breeding host, I compare egg galleries, brood production, and adult characteristics of D. ponderosae reared in lodgepole, limber, and jack pine logs. Brood productivity, beetle size, sex ratios, and egg gallery characteristics are described for beetle populations reared from naturally infested limber pine logs from southwestern Alberta, and from artificially infested jack pine logs from east-central Alberta and central Saskatchewan. In a field experiment where logs of the three hosts were placed together, adult beetles and their gallery characteristics are described and compared on the three hosts. The results confirm that jack pine is a viable host, that D. ponderosae’s attack characteristics, survival, and progeny on jack pine all appear comparable to those characters observed for beetles reared on lodgepole pine, and that limber pine is highly productive of beetle brood.

OBSERVATIONS ON A TRIAL OF BROADCAST BURNING TO CONTROL AN INFESTATION OF THE MOUNTAIN PINE BEETLE DENDROCTONUS PONDEROSAE

1989 ◽  
Vol 121 (6) ◽  
pp. 521-523 ◽  
Author(s):  
A.J. Stock ◽  
R.A. Gorley
Keyword(s):  
Pinus Contorta ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Management Plan ◽  
Management Program ◽  
Control Measures ◽  
Direct Control ◽  
Mountain Pine ◽  
Pine Beetle

The mountain pine beetle, Dendroctonus ponderosae Hopk., causes extensive mortality of lodgepole pine, Pinus contorta var. latifolia Engelm., throughout western North America (Van Sickle 1982). The Prince Rupert Forest Region, in the northwest of British Columbia, initiated an aggressive beetle management program in 1981. Logging of infested stands, and winter felling and burning of individual infested trees are the most common direct control techniques.The “Bristol Lake” infestation developed in the Bulkley Forest District, approximately 55 km northwest of Smithers, B.C., on a steep rocky ridge within the valley of Harold Price Creek. The area contained large volumes of mature lodgepole pine, and control of the infestation was therefore considered critical to the local beetle management plan, but the size (50 ha) and rough topography of the infested area precluded normal direct control measures.

DENDROCTONUS PONDEROSAE (COLEOPTERA: SCOLYTIDAE): PRE-AGGREGATION LANDING AND GALLERY INITIATION ON LODGEPOLE PINE

1980 ◽  
Vol 112 (2) ◽  
pp. 185-191 ◽  
Author(s):  
Barry G. Hynum ◽  
Alan A. Berryman
Keyword(s):  
Pinus Contorta ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Mountain Pine ◽  
Pine Beetle

AbstractLanding rates as monitored by landing traps indicate that the mountain pine beetle, Dendroctonus ponderosae Hopkins, is not attracted to lodgepole pine, Pinus contorta Dougl., prior to the first gallery start. Bark terpene odors and DBH were not correlated with beetle landing rates, with the exception of beta-phellandrene which accounted for a statistically significant 18% of the variation in landing rates. Beetles were unable to distinguish between hosts, dead hosts and nonhosts during landing. The elderberry pith bioassay indicated the presence of a gallery initiation stimulant in the bark.

Pre-logging Baiting with Semiochemicals for the Mountain Pine Beetle, Dendroctonus Ponderosae, in High Hazard Stands of Lodgepole Pine

1986 ◽  
Vol 62 (1) ◽  
pp. 20-23 ◽  
Author(s):  
J. H. Borden ◽  
L. J. Chong ◽  
T. E. Lacey
Keyword(s):  
Pinus Contorta ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Cost Effective ◽  
Additional Advantage ◽  
Mountain Pine ◽  
Massive Influx ◽  
Pine Beetle ◽  
High Hazard

Baiting of trees with attractive semiochemicals prior to logging in three high hazard blocks of lodgepole pine (Pinus contorta var. latifolia Engelm.) was effective in inducing attack by the mountain pine beetle (Dendroctonus ponderosae Hopkins) on baited trees and on surrounding unbaited trees. There was evidence for partial shifting of attack loci, concentration of dispersing beetles and containment of emergent beetles as a result of the baiting program. However, baiting was ineffective when the baits were within the understory canopy, and the baiting program did not cause a massive influx of beetles from infestations 75-200 m away from the baited blocks. Such baiting programs would be cost effective if they avoided the necessity of disposing of two attacked trees/ha outside of the baited blocks. They have the additional advantage of reducing the risk of future beetle attacks by removing beetles and their broods during logging of induced infestations.

HOST EFFECTS ON THE PHENOLOGY, DEVELOPMENT, AND MORTALITY OF FIELD POPULATIONS OF THE MOUNTAIN PINE BEETLE, DENDROCTONUS PONDEROSAE HOPKINS (COLEOPTERA: SCOLYTIDAE)

1989 ◽  
Vol 121 (2) ◽  
pp. 149-157 ◽  
Author(s):  
David W. Langor
Keyword(s):  
Gene Flow ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Regular Monitoring ◽  
Limber Pine ◽  
Pine Beetle ◽  
Declining Populations ◽  
New Hosts ◽  
Better Than

AbstractPhenology, fecundity, development, and mortality were studied for co-occurring, declining populations of Dendroctonus ponderosae Hopkins in limber pine and lodgepole pine at two sites in the Porcupine Hills of southwestern Alberta in 1985–1986. Beetles reared in lodgepole pine emerged and attacked new hosts 7–8 days earlier than those in limber pine in 1985. Beetles were able to utilize over two-thirds of the length of each limber pine bole but only about one-third of the length of each lodgepole pine bole. Also, beetles infesting limber pine had significantly higher fecundity, produced more eggs per centimetre of gallery length, and their progeny developed faster and survived better than beetles infesting lodgepole pine. There was no apparent phenological or other barrier that might inhibit gene flow between D. ponderosae populations in limber pine and lodgepole pine. In the area studied, limber pine was a better host for D. ponderosae reproduction, development, and survival than was lodgepole pine. Thus, beetle populations may be able to increase much more quickly in limber pine, arguing for regular monitoring of these populations.

EMERGENCE OF IPS PINI AND HYLURGOPS POROSUS (COLEOPTERA: SCOLYTIDAE) FROM DUFF AT THE BASE OF LODGEPOLE PINES (PINACEAE) KILLED BY MOUNTAIN PINE BEETLE (COLEOPTERA: SCOLYTIDAE)

1999 ◽  
Vol 131 (6) ◽  
pp. 825-827 ◽  
Author(s):  
L. Safranyik ◽  
D.A. Linton ◽  
T.L. Shore
Keyword(s):  
Pinus Contorta ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Ips Pini ◽  
Mountain Pine ◽  
Pine Beetle ◽  
Lodgepole Pines ◽  
Root Collar

Lodgepole pines, Pinus contorta var. contorta Engelmann, killed by mountain pine beetle, Dendroctonus ponderosae Hopkins, are often subsequently infested by other scolytid species (Safranyik et al. 1996). Ips pini (Say) breeds in the phloem region of the main bole and larger branches in areas not occupied by mountain pine beetle. Adults emerge in the fall and drop to overwinter in the duff near the bases of their brood trees (Safranyik et al. 1996). Hylurgops porosus (LeConte) infests lodgepole pine (Keen 1952; Bright 1976) stumps or severely weakened trees near the root collar and in large roots (Wood 1982). We examined the pattern of emergence of I. pini and H. porosus from the duff around infested trees to describe changes in density over distance from the trees.

scholarly journals The Application of Behaviour-modifying Chemicals to Contain Infestations of the Mountain Pine Beetle, Dendroctonus ponderosae

1983 ◽  
Vol 59 (5) ◽  
pp. 235-239 ◽  
Author(s):  
J. H. Borden ◽  
L. J. Chong ◽  
K. E. G. Pratt ◽  
D. R. Gray
Keyword(s):  
British Columbia ◽  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Salvage Logging ◽  
Mountain Pine ◽  
Experimental Block ◽  
Pine Beetle ◽  
Overall Ratio

Five replicates of paired forest blocks containing lodgepole pine, Pinus contorts var. latifolia Engelm., infested by the mountain pine beetle, Dendroctonus ponderosae Hopkins, were chosen in the spring of 1982 in various interior British Columbia locations. Within the experimental block of each pair, one lodgepole pine every 50 m (4 trees/ha) was baited with the attractive semiochemicals myrcene, trans-verbenol and exo-brevicomin. The baiting program caused the attack in 1982 to be concentrated in and around the baited trees, whereas it was more dispersed in the control blocks. The overall ratio of 1982: 1981 attacked trees was 2.5 in the baited blocks and 1.8 in the controls, suggesting that dispersal of beetles out of the baited blocks was inhibited. Baiting of trees with semiochemicals is recommended to contain infestations within prescribed boundaries when sanitation-salvage logging cannot be completed prior to mid-summer flight of emergent brood beetles.

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