Sapwood Stored Resources Decline in Whitebark and Lodgepole Pines Attacked by Mountain Pine Beetles (Coleoptera: Curculionidae)

2016 ◽  
Vol 45 (6) ◽  
pp. 1463-1475
Author(s):  
Eleanor C. Lahr ◽  
Anna Sala
Keyword(s):  
Mountain Pine Beetles ◽  
Mountain Pine ◽  
Lodgepole Pines ◽  
Pine Beetles

Displacement and aggregation of mountain pine beetles, Dendroctonusponderosae (Coleoptera: Scolytidae), in response to their antiaggregation and aggregation pheromones

1993 ◽  
Vol 23 (2) ◽  
pp. 286-290 ◽  
Author(s):  
B.S. Lindgren ◽  
J.H. Borden
Keyword(s):  
Aggregation Pheromones ◽  
Mountain Pine Beetles ◽  
Mountain Pine ◽  
Lodgepole Pines ◽  
Pine Beetles ◽  
Release Devices

Deployment of verbenone release devices at 10-m centres significantly reduced the percent of available lodgepole pines (Pinuscontorta Dougl. var. latifolia Engelm.) that were mass attacked by mountain pine beetles (Dendroctonusponderosae Hopkins) in 50 × 150 m subplots flanked on each side by identical subplots, regardless of whether the flanking plots were baited with tree baits or left untreated. Verbenone treatment also increased the percent of unsuccessful attacks (<31.25 attacks/m2) in the central subplot compared with when the central subplot was left untreated. Tree baits, composed of trans-verbenol, exo-brevicomin, and myrcene, applied in flanking subplots did not affect significantly the percent of trees mass attacked nor the attack density. However, assuming a 2:1 expected ratio of attacks in the two flanking subplots over the central subplot, χ2-tests indicated that the attack distribution was consistently altered only when both verbenone and aggregation pheromones were applied. This study suggests that a "push–pull" tactic using aggregation and antiaggregation pheromones may be feasible for managing this destructive pest.

Mathematical Elements of Attack Risk Analysis for Mountain Pine Beetles

2000 ◽  
Vol 204 (4) ◽  
pp. 601-620 ◽  
Author(s):  
JAMES POWELL ◽  
BRUCE KENNEDY ◽  
PETER WHITE ◽  
BARBARA BENTZ ◽  
JESSE LOGAN ◽  
...  
Keyword(s):  
Risk Analysis ◽  
Mountain Pine Beetles ◽  
Mountain Pine ◽  
Pine Beetles

THE RELATIONSHIP BETWEEN DENSITY OF EMERGED DENDROCTONUS PONDEROSAE (COLEOPTERA: SCOLYTIDAE) AND DENSITY OF EXIT HOLES IN LODGEPOLE PINE

1985 ◽  
Vol 117 (3) ◽  
pp. 267-275 ◽  
Author(s):  
L. Safranyik ◽  
D.A. Linton
Keyword(s):  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Latex Paint ◽  
Mountain Pine Beetles ◽  
Emergence Period ◽  
South Central ◽  
Mountain Pine ◽  
Pine Beetle ◽  
Pine Beetles ◽  
The Relationship

AbstractThe relationship between the density of insect holes in the bark (X1) and the density of emerged mountain pine beetles (Y) was investigated in naturally infested lodgepole pine in south-central British Columbia. The density of exit and ventilation holes (Ho) that were present in the bark prior to emergence by mountain pine beetle averaged 10% of all holes present following the emergence period. There was a weak but significant inverse relationship between Ho and both phloem thickness and density of emerged mountain pine beetles. Painting the bark with light-color latex paint did not affect survival or the temporal pattern of emergence by mountain pine beetle but ensured identification and greatly enhanced counting of fresh exit holes. Of the several regression models investigated, the relation between Y and both X1 and X2 (= X1 – Ho) was best fitted by a log-log linear model. A method is suggested for setting limits on the size of exit holes cut by mountain pine beetle in order to exclude from X2 much of the variation caused by exit holes cut by associated insects. A simple mathematical model was developed of the relationship between mean density of exit holes and the density of emerged mountain pine beetles.

DEVELOPMENT AND SURVIVAL OF AXENICALLY REARED MOUNTAIN PINE BEETLES, DENDROCTONUS PONDEROSAE (COLEOPTERA: SCOLYTIDAE), AT CONSTANT TEMPERATURES

1985 ◽  
Vol 117 (2) ◽  
pp. 185-192 ◽  
Author(s):  
L. Safranyik ◽  
H. S. Whitney
Keyword(s):  
Developmental Stages ◽  
Incubation Temperature ◽  
Adult Stage ◽  
Base Temperature ◽  
Heat Unit ◽  
Mountain Pine Beetles ◽  
Mountain Pine ◽  
Development Times ◽  
Temperature Heat ◽  
Pine Beetles

AbstractThe development and survival of mountain pine beetles axenically reared on standardized diet at 8 constant temperatures (10°–35 °C) were observed. At 32 °and 35 °C, 22 and 18% of the eggs hatched and all larvae died within 10 d of hatching. At the lower temperatures, 60–70% of the eggs hatched. The highest survival for all developmental stages was at 24 °C. At 10° and 15 °C development of all beetles reared in bolts of lodgepole pine or on axenic diet stopped when larvae were fully developed, whereas at 24 °and 27 °C all of the beetles developed normally to the adult stage. Larvae that had stopped developing during rearing at 15 °C resumed development after being transferred to 24 °C, indicating that pupation was limited by temperature. Although mean development times to the larval, pupal, and adult stages all decreased with increasing incubation temperature, heat-unit requirements above a base temperature of 5.6 °C were lowest for individuals reared at 27 °and 24 °C for all developmental stages. At these temperatures, an estimated average of 673 and 674 degree-days above 5.6 °C were required for development from egg to the tanned (dark) adult stage, respectively. The average widths of the prothorax and the sex ratios of axenic beetles were within published ranges. Mean development times and heat-unit requirements at constant temperatures for development to various life stages agreed well with published field and laboratory studies from western Canada.

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