A Test of High-Dose Verbenone for Stand-Level Protection of Lodgepole and Whitebark Pine from Mountain Pine Beetle (Coleoptera: Curculionidae: Scolytinae) Attacks

The efficacy of verbenone as a stand-level protectant against mountain pine beetle, Dendroctonus ponderosae Hopkins, attacks was tested in lodgepole and whitebark pine stands at five geographically separated sites, including three consecutive years at one site. Forty and 20 high-dose pouches, with a...

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Bibliographic Details
Published in:Journal of economic entomology 2005-10, Vol.98 (5), p.1614-1621
Main Authors: Bentz, B. J., Kegley, S., Gibson, K., Thier, R.
Format: Article
Language:English
Subjects:
antiaggregation pheromones
application rate
bark beetle
bark beetles
Biological and medical sciences
biological control
Control
Dendroctonus ponderosae
dose response
FOREST ENTOMOLOGY
forest stands
Fundamental and applied biological sciences. Psychology
Generalities
insect control
Insect Control - methods
Insecta
Insecticides - administration & dosage
Invertebrates
pheromone
Phytopathology. Animal pests. Plant and forest protection
Pinus
Pinus albicaulis
Pinus contorta
plant protection
Population Density
pouches
Protozoa. Invertebrates
semiochemical
spatial distribution
Terpenes - administration & dosage
verbenone
Weevils - physiology
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Summary:The efficacy of verbenone as a stand-level protectant against mountain pine beetle, Dendroctonus ponderosae Hopkins, attacks was tested in lodgepole and whitebark pine stands at five geographically separated sites, including three consecutive years at one site. Forty and 20 high-dose pouches, with a verbenone emission rate up to 50 mg/d per pouch, were spaced in a grid pattern throughout 0.40-ha plots, replicated up to six times at each site. Although the verbenone treatment did not prevent beetles from dispersing through treated stands, attacking large-diameter trees most frequently, the overall number of trees attacked was, on average, reduced significantly compared with nontreated stands. In a few blocks each year, verbenone-treated plots had more attacked trees than controls. These blocks tended to have a large emerging beetle population, exceeding 140 previously attacked trees within the hectare including and surrounding the treated area. Additional research is needed on the behavioral role of verbenone in mountain pine beetle population dynamics and quantification of the infestation level above which treatment efficacy tends to be reduced.
ISSN:0022-0493
1938-291X
DOI:10.1603/0022-0493-98.5.1614