Fine-Scale Genetic Structure of (Coleoptera: Curculionidae) Based on Mitochondrial : The Role of Host Specificity and Spatial Distance.

The Camellia weevil, (Chevrolat, 1978), is a dominant oligophagous pest that bores into the fruit of oil-tea . Genetic differentiation among populations in various hosts can easily occur, which hinders research on pest management. In this study, the genetic structure, genetic diversity, and phylogenetic structure of local populations were examined using 147 individuals (from 6 localities in Jiangxi), based on 2 mitochondrial markers. Results indicated that the population in Jiangxi exhibits a high haplotype diversity, especially for the populations from plantations. Structural differentiation was observed between Haplogroup 1 (73 individuals from Ganzhou, Jian, and Pingxiang) in the monoculture plantations of and Haplogroup 2 (75 individuals from Pingxiang and Jiujiang) in . Two haplogroups have recently undergone a demographic expansion, and Haplogroup 1 has shown a higher number of effective migrants than Haplogroup 2. This suggests that has been spreading from plantations to other oil-tea , such as . The increased cultivation of oil-tea in Jiangxi has contributed to a unique genetic structure within the population. This has, in turn, expanded the distribution of and increased migration between populations.