In this study, five sample plots were selected from pure Crimean pine (Pinus nigra Arnold. subsp. nigra var. caramanica (Loudon) Rehder.) stands and DBH, height and crown diameter were measured on the live Crimean pine trees, of which DBH was higher than 4 cm, in these sample plots in Ilgaz Mountain, Cankiri, Turkey. At the end of the regression analysis carried out on the data of a total of 239 trees, it was determined that there were statistically significant (p<0.001) and strong (R2>0.50) relationships between DBH, height and crown diameter variables in Crimean pines. The strongest relationship determined was the crown diameter-height relationship (R2 = 0.977), followed by the height-DBH (R2 = 0.883) and crown diameter-DBH (R2 = 0.851) relationships, respectively. The results of the study indicated that the height-DBH and crown diameter-height relationships can be described by the second-degree polynomial model, while the crown diameter-DBH relationship can be described by the power model and heights and crown diameters can be estimated by means of DBH, of which measurement is easy, in Crimean pines of the research area. According to inspections on bark samples which obtained from Crimean pines in sample plots and catches at the light trap, Ips acuminatus (Gyll.), Orthotomicus erosus (Woll.), Pityogenes quadridens (Hartig) (Coleoptera: Scolytidae), Dendrolimus pini (L.) (Lepidoptera: Lasiocampidae) and Sphinx pinastri (L.) (Lepidoptera: Sphingidae) were determined at stands of 10-60 cm dbh, 50-110 age, 40-70% slope, generally south and southeast aspects and at elevation of 1280-1400 m where Crimean pine dominated.
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Nuri Oner, Ziya Simsek and Yalcin Kondur, 2006. Relationships Between Different Growth Parameters and Damage of Harmful Insects in Crimean Pine of Ilgaz Mountain, Cankiri, Turkey. Journal of Biological Sciences, 6: 1071-1076.
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