Abstract:

Genetic diversity，genetic differentiation and factors affected of invasive fall webworm (Hyphantria cunea) populations in China were investigated using micro-satellite technology. DNA extracted from 300 individuals were amplified using 10 SSR primers. The percentage of polymorphic loci showed that the order in the five populations was Cangzhou population，Yantai population，Qinhuangdao population，Dandong population，Shijiazhuang population. The genetic differentiation of fall webworm： 34.38%variation derived from different populations，65.62% of the variation existed within the same population，the genetic distances ranged from 0.138 6 to 0.322 4. The result of UPGMA clustering showed that population differentiation closely related to the time of differentiation and the sources of invasion. The major factors affecting the genetic diversity of fall webworm populations were longitude，the ratio of plain，annual precipitation，latitude，the invasion of time. The formation of genetic structure was correlated with characteristics of the life cycle and invasion ecology.

Key words: Hyphantria cunea, genetic diversity, genetic differentiation, factors, SSR