Risk analysis of Exocentrus beijingensis Chen in Gansu Province

Exocentrus beijingensis Chen was a stem-boring insect pest mainly attacking many trees,such as Robinia pseudoacacia Malus pumila and Malus spectabilis. It was first founded in Anding District, Dingxi City, Gansu Province in 2008 and occured one generation for a year.It mainly harmed the branches of R. pseudoacacia which could threaten the afforestation results of Gansu Province. The result of pest risk analysis showed that the R value of E. Beijingensis was 1.77 and was a moderate devastating forest pest in Gansu Province.