2.1 Occurrence data of PWD
Data on the epidemic areas of pine wilt disease were obtained from the National Forestry and Grassland Administration (http://www.forestry.gov.cn/main/5461/20220114/221304653870544.html). Duplicate data points and specimen details with unknown geographic coordinates were removed. For available records lacking coordinates, latitude and longitude information corresponding to the place names was obtained using Baidu tools (http://api.map.baidu.com/lbsapi/getpoint/index.html). A total of 646 points of PWD were selected and saved as a “.csv” file for later use (Fig. 1).
Fig. 1. Occurrence records of PWD in China.