Abstract: The RAPD (random amplified polymorphic DNA) analysis on the differentiation of 19 geographical populations of striped flea beetle Phyllotreta striolata in Fujian Province showed that a better reproducibility was achieved when the same primers were used for the amplification of same P. striolata population, and higher differences were observed when the same primers were used for the amplification of different populations. The 19 populations of P. striolata could be divided into four groups, i.e., southeastern coastal region group, northwestern group, Quanzhou group, and Dongshan island group, and the genetic distance of the populations was related to geographical distance. The occurrence of Quanzhou group and Dongshan island group indicated that the differentiation among the geographical populations of P. striolata could be caused by the effects of landform, vegetable planting, and insecticide application.

Key words: Alsophila spinulosa, Population structure, Spatial distribution pattern, Dynamics, Scale