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http://dx.doi.org/10.14578/jkfs.2018.107.4.486

Analysis of Pinewood Nematode Damage Expansion in Gyeonggi Province Based on Monitoring Data from 2008 to 2015  

Park, Wan-Hyeok (Department of Forest Resources, Kookmin University)
Ko, Dongwook W. (Department of Forest, Environment, and System, Kookmin University)
Kwon, Tae-Sung (Forest Insect Pests and Diseasest Division, National Institute of Forest Science)
Nam, Youngwoo (Forest Insect Pests and Diseasest Division, National Institute of Forest Science)
Kwon, Young Dae (Gyeonggi Forest Environment Research Center)
Publication Information
Journal of Korean Society of Forest Science / v.107, no.4, 2018 , pp. 486-496 More about this Journal
Abstract
Pine wilt disease (PWD) in Gyeonggi province was first detected in Gwangju in 2007, and ever since has caused extensive damage. Insect vector and host tree in Gyeonggi province are Monochamus saltuarius and Pinus koraiensis, respectively, which are different from the southern region that consist of Monochamus alternatus and Pinus densiflora. Consequently, spread and mortality characteristics may be different, but our understanding is limited. In this research, we utilized the spatial data of newly infected trees in Gyeonggi province from 2008 to 2015 to analyze how it is related to various environmental and human factors, such as elevation, forest type, and road network. We also analyzed the minimum distance from newly infected tree to last year's closest infected tree to examine the dispersal characteristics based on new outbreak locations. Annual number of newly infected trees rapidly increased from 2008 to 2013, which then stabilized. Number of administrative districts with infected trees was 5 in 2012, 11 in 2013, and 15 in 2014. Most of the infected trees was Pinus koraiensis, with its proportion close to 90% throughout the survey period. Mean distance to newly infected trees dramatically decreased over time, from 4,111 m from 2012 to 2013, to approximately 600 m from 2013 to 2014 and 2014 to 2015. Most new infections occurred in higher elevation over time. Distance to road from newly infected trees continuously increased, suggesting that natural diffusion dispersal is increasingly occurring compared to human-influenced dispersal over time.
Keywords
GIS; spatial analysis; Monochamus saltuarius; Pinus koraiensis; Korean pine forest;
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