Pest Management Science (2021) 77, 1683-1693

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Ming-Zhu Chen, Li-Jun Cao, Bing-Yan Li, Jin-Cui Chen, Ya-Jun Gong, Qiong Yang, Thomas L. Schmidt, Lei Yue, Jia-Ying Zhu, Hu Li, Xue-Xin Chen, Ary Anthony Hoffmann and Shu-Jun Wei (2021)
Migration trajectories of the diamondback moth Plutella xylostella in China inferred from population genomic variation
Pest Management Science 77 (4), 1683-1693
The diamondback moth (DBM), Plutella xylostella (Lepidoptera: Plutellidae), is a notorious pest of cruciferous plants. In temperate areas, annual populations of DBM originate from adult migrants. However, the source populations and migration trajectories of immigrants remain unclear. Here, we investigated migration trajectories of DBM in China using genome-wide single nucleotide polymorphisms (SNPs) genotyped using double-digest RAD (ddRAD) sequencing. We first analyzed patterns of spatial and temporal genetic structure among southern source and northern recipient populations, then inferred migration trajectories into northern regions using discriminant analysis of principal components (DAPC), assignment tests, and spatial kinship patterns.
Temporal genetic differentiation among populations was low, indicating that sources of recipient populations and migration trajectories are stable. Spatial genetic structure indicated three genetic clusters in the southern source populations. Assignment tests linked northern populations to the Sichuan cluster, and central–eastern populations to the southern and Yunnan clusters, indicating that Sichuan populations are sources of northern immigrants and southern and Yunnan populations are sources of central–eastern populations. First-order (full-sib) and second-order (half-sib) kin pairs were always found within populations, but ~ 35–40% of third-order (cousin) pairs were found in different populations. Closely related individuals in different populations were found at distances of 900–1500 km in ~ 35–40% of cases, while some were separated by > 2000 km.
This study unravels seasonal migration patterns in the DBM. We demonstrate how careful sampling and population genomic analyses can be combined to help understand cryptic migration patterns in insects.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Database assignments for author(s): Xue-Xin Chen, Ary A. Hoffmann, Shu-Jun Wei, Thomas L. Schmidt

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.
Plutella xylostella China (south)