The relationship between the occurrence of Colorado Potato Beetle, Leptinotarsa decemlineata, and rivers based on GIS: a case study of Shawan Country Emergence mechanism and the factors influencing overwintering Colorado potato beetle in Xinjiang, China Spatial distribution pattern and sequential sampling of Colorado potato beetle, Leptinotarsa decemlineata Say Attraction effect of different host-plant to Colorado potato beetle Leptinotarsa decemlineata