YALÇIN KONDUR, Bayram Cemil BİLGİLİ, ZİYA ŞİMŞEK, MUHAMMED NURİ ÖNER

Monitoring the Epidemic of Bark Beetles Determined in Uludag Fir Stands in Ilgaz (Derbent and Doruk) via Landsat Satellite Images

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Monitoring the Epidemic of Bark Beetles Determined in Uludag Fir Stands in Ilgaz (Derbent and Doruk) via Landsat Satellite Images

Results of the studies carried out in Ilgaz (Derbent and Doruk) in 1999-2000 showed that Cryphalus piceae (Ratz.), Ips acuminatus (Gyll.), Orthotomicus erosus (Woll.), Pityogenes quadridens (Hartig), Ips (Pityokteines) curvidens (Germ.), Tryphodendron lineatus (Oliver) (Scolytidae), Pissodes piceae (Illig.) (Curculionidae) were important insect species where the Uludag fir (Abies nordmanniana subsp. bornmulleriana Mattf.) is the dominant tree species at altitudes between 1,700 and 2,000 m, mostly on north and northwest aspects, stand closures between 80 and 100%, slopes between 35 and 100%, at ages between 50-120, and dbh between 20 and 70 cm. It was also another result that those bark beetles were higher in pure fir stands and they preferred fir trees where Scots pine (Pinus sylvestris L.) and Anatolian black pine (Pinus nigra Arnold. subsp. pallasiana var. caramanica) exist in the stand composition. It was determined that Ips (Pityokteines) curvidens and Cryphalus piceae in fir stands, and Ips sexdentatus (Boerner) in Scots pine and Anatolian black pine stands have been increasing during last years. In this study, Landsat images (of August 1, 1998; July 13, 2000 and August 15, 2009) were used and both geometrical and atmospherically corrections were applied to these images. Epidemic of the bark beetles was observed via the spatial and temporal variation via the NDVI data of the geometrically and atmospherically corrected images. It was concluded that certain openings have been occurred between 1998 and 2000 due to windfalls and snow breaks. This condition has been proven via satellite images. It could be concluded that fir stands show improvement in observations whereas the population densities of certain bark beetle species (I. curvidens, C. piceae and I. sexdentatus) are increasing in the last years according to the insects caught in pheromone traps

Keywords:

Ilgaz, Bark beetles, NDVI, Landsat Uludag fir,

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