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  • pines
  • Fifteen Ponderosa pines were selected at a site remote from urban and industrial sources of air pollution and the trees sampled at 18 intervals over a 15 month study period. (osti.gov)
  • Thus
  • Thus, the negative effects of increased transpiration in ponderosa pine may be offset by their smaller interception losses when compared to cordilleran cypress. (oregonstate.edu)
  • long term
  • The objective of the research was to investigate the potential of foliar S:N ratios in Ponderosa pine as bioindicators of foliar sulfur loading in areas of long-term exposure to low levels of sulfurous air pollutants. (osti.gov)
  • beetles
  • In terms of the risk of damage to Valley ponderosa pine by insects, localized outbreaks of bark beetles represent the most significant threat (Fig. 1). (westernforestry.org)
  • Funding provided by the USDA Forest Service in 2008 and 2009 has allowed us to assess the diversity of bark beetles that occur over the range of Valley ponderosa, and reported here are the results of pheromone-baited trapping completed at 11 sites along a North (Beaverton) to South (Creswell) gradient from May-October 2008 and April-October 2009. (westernforestry.org)
  • At all sites, the overwhelming majority of bark beetles captured were the California five-spined Ips (Ips paraconfusus), which in recent years has been the most frequently observed to cause damage to Valley ponderosa pine. (westernforestry.org)
  • Other potentially damaging bark beetles, also collected in small numbers, included Dendroctonus species such as the red turpentine beetle (D. valens), western pine beetle (D. brevicomis), and even mountain pine beetle (D. ponderosae). (westernforestry.org)
  • The attractant response of Ips confusus to frass produced by male beetles boring in ponderosa pine can be reproduced, in a laboratory bioassay, by a combination of compound I with either compound II or compound III, all isolated from frass. (sciencemag.org)
  • widespread
  • We utilized a recently available, geographically widespread dataset of intraspecific variation (haplotypes) for ponderosa pine and a recently devised lineage distance modeling approach to derive additional, likely intraspecific occurrence locations. (deepdyve.com)
  • insects
  • By removing insects, the birds indirectly altered the terpene composition of pine tissues, said CU-Boulder biology Professor Yan Linhart. (cyberwest.com)
  • circumference
  • The Oregon champion, at La Pine State Park in Deschutes County, is 178 feet tall and 342 inches in circumference. (oregonencyclopedia.org)
  • This giant pine is twenty-five feet in circumference-approximately a fourth of the height of the tree-at six feet above the ground, and its first branch is nearly two feet in diameter. (ca.us)
  • ratios
  • The objective of the research was to investigate the potential of foliar S:N ratios in Ponderosa pine as bioindicators of foliar sulfur loading in areas of long-term exposure to low levels of sulfurous air pollutants. (osti.gov)