A preliminary Drosophila suzukii life table
Author of the article:WU Hao1** FANG Yuan1 XIE Dong-Sheng3 CHEN Zheng-Jun1 DOU Wen-Jun1 ZHANG Feng2 CHEN Guo-Hua1**
Author's Workplace：1. College of Plant Protection,Yunnan Agricultural University, National Key Laboratory for Conservation and Utilization of Biological Resources in Yunnan, Kunming 650201, China; 2. The Institute of Plant Protection,Chinese Academy of Agricultural Sciences, MOA-CABI Joint Laboratory for Bio-safety, State Key Laboratory of Plant Diseases and Insect Pests, Beijing 100193, China; 3. Devision of European Affairs, Foreign Economic Cooperation Center Ministry of Agriculture, P. R. China China-EU Center for Agriculture Technology, Beijing 100125, China
Key Words：Drosophila suzukii, natural population, the life table, the key factor
Abstract：
[Objectives] To explore the key factors that affect Drosophila suzukii populations in the natural environment. [Methods] From July to September 2015, demographic data collected from captive and wild D. suzukii populations were combined to create a life table. [Results] The developmental period of wild D. suzukii were: (22.50±2.78) h for the egg stage, (23.14±2.27) h for the 1st instar, (48.86±4.14) h for the 2nd instar, (79.00±11.01) h for the 3rd instar, and (99.00±6.00)h for the pupal period. The survival curve of D. suzukii was of the A-type. In orchards, the key developmental periods were: the egg period in July and the 1st -2nd instar periods in August and September, respectively. In cedar forest, the key development periods of Drosophila suzukii were the egg period in both August and September. The key lethal factor was natural death during the egg period, and competition in the 1st and 2nd instar periods. [Conclusion] The key factors that affect natural populations of D. suzukii are natural egg mortality and competition. This species has an A-type survival curve and key lethal factors vary with both environment and development period.