Spatial and temporal genetic analyses of Lycorma delicatula (Hemiptera:Fulgoridae) in South Korea

Lycorma delicatula is invasive pest, native to China, in Korea. It has rapid spread throughout South Korea where the species causes crop damage, especially vineyard crops. We studied the genetic variability and structure of four populations of L. delicatula between 2010 and 2012 in Korea. From sample location and time were genotyped at seven microsatellite loci. In total, 80 alleles were detected across the 7 microsatellite loci. The number of alleles was 6.32 and 5.29 in 2010 and 2011, respectively. Pairwise FST estimates ranged from 0.022 (GJ-2012 and DG-2012) to 0.071 (CA-2010 and GJ-2012). Genetic differentiation between each pair population indicated the significant, except for SW and GJ population both 2010 and 2012. In principal coordinate (PCo) analysis, the mean factor scores were plotted along the first principal component axes, which accounted for 33.47% of the total variance. The value of K calculated from Ln P(D) of the STRUCTURE output revealed a maximum value of 16.19 at K = 2 among the genotypes. In this study, geographical spread of L. delicatula in South Korea were discussed through genetic profiles.