Genetic divergence of four Dioryctria species from North China.
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Key Words：Dioryctria, COⅠ sequences, genetic diversity, phylogeny
Abstract： The phylogenesis of 9 geographical populations from 4 Dioryctria specie s, D. rubella Hampson, D. yiai Mutuura & Munroe, D. magnifica Munroe a nd D. abietella Denis & Schiffermüller were investigated based on COⅠ sequ e nces, with Oncocera faecella (Zeller) as outgroup. The genetic distances and phylogenetic tree revealed that:(1) the 4 Dioryctria species could be grouped into 2 clades. D．rubella and D. magnifica were clustered as one group, while D. yiai and D．abietella were clustered as the other; (2) the genetic distances b etween the geographic al populations were 0.000-0.016, significantly less than those between the s pecies (0.029-0.089), which indicated that COⅠ sequences may be suitable fo r determining the phylogenetic relationships of Dioryctria species.