A Progress Report of a Study on the Susceptibility of Old-growth Ponderosa Pine in Montana to Bark Beetle Attacks PDF Download
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Author:
Publisher:
ISBN:
Category : Ponderosa pine
Languages : en
Pages : 72
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Book Description
Author:
Publisher:
ISBN:
Category : Ponderosa pine
Languages : en
Pages : 72
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Book Description
Author:
Publisher:
ISBN:
Category : Ponderosa pine
Languages : en
Pages : 72
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Author: Philip Cornwell Johnson
Publisher:
ISBN:
Category : Bark beetles
Languages : en
Pages : 8
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Book Description
The boles of 71 mature ponderosa pine trees killed by Dendroctonus brevicomis LeConte (Coleoptera: Scolytidae) were analyzed to determine the distribution of the attacks by endemic populations of this bark beetle and those of several phloem -feeding associates. The longitudinal -circumferential distribution of the attacks fitted dia- grammatically into four distinguishable bole infestation patterns. The characteristics of the patterns and similarities with comparable ?attacks of D. brevicomis in northeastern California are discussed.
Author: Philip Cornwell Johnson
Publisher:
ISBN:
Category : Bark beetles
Languages : en
Pages : 44
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Author: David C. Chojnacky
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 16
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Book Description
Two empirical methods for rating susceptibility of mountain pine beetle attack in ponderosa pine were evaluated. The methods were compared to stand data modeled to objectively rate each sampled stand for susceptibly to bark-beetle attack. Data on bark-beetle attacks, from a survey of 45 sites throughout the Colorado Plateau, were modeled using logistic regression to estimate the probability of attack on individual trees from tree and stand variables. The logistic model allowed flexibility to easily scale results up to a stand level for comparison to the empirical methods. The empirical method, developed by Munson and Anhold, most closely correlated to the logistic regression results. However, the Munson/Anhold method rated all 45 study sites as either moderately or highly susceptible to bark-beetle attack, which raises concern about its lack of sensitivity. Future work on evaluating risk of bark-beetle impact should consider more than stand characteristics.
Author: EDWIN WALFRED MOGREN
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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Author: Intermountain Forest and Range Experiment Station (Ogden, Utah)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 72
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Author: Intermountain Forest and Range Experiment Station (Ogden, Utah)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 194
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Author:
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 20
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Ten-year diameter and basal area growth were determined for partially cut stands at 4 locations. Average diameters in the partially cut plots generally increased by 1 inch or more, while average diameter in the uncut controls increased by 0.9 inches or less. Individual tree growth is discussed in relation to potential susceptibility to mountain pine beetle infestation. Basal area increases ranged from 0.9 to 1.9 ft2/acre/ yr in partially cut plots, while basal area increases in the control plots ranged from 0.4 to 1.4 ft2/acre/yr. Endemic mountain pine beetle infestations and snow breakage accounted for most of the mortality on the plots, which decreased the residual basal area and basal area growth. Increases in basal area are used to estimate the length of time required for various stand densities to reach the susceptibility thresholds for mountain pine beetle infestation. Stand marking may influence future susceptibility to beetle infestations.
Author: United States. Forest Service
Publisher:
ISBN:
Category : Forest policy
Languages : en
Pages : 684
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