The seasonal abundance of Drosophila suzukii in orchards and seasonal variation in fruit damage caused by this pest
Author of the article:ZHAO Chao1** LI Ping3** XIE Dong-Sheng4 HU Chun-Hua1 XIONG Yan1 HE Li-Ying2 LI Wei-Hong2 XIA
Author's Workplace：1. Yunnan Agricultural University, Kunming 650201, China; 2. Plant Protection Stationof Shiping County, Shiping 662200, China; 3. National Agricultural Technical Extension and Service Center, Ministry of Agriculture, Beijing 100125, China; 4. Division of European Affairs, Foreign Economic Cooperation Center, Ministry of Agriculture, P. R. China, Beijing 100125, China
Key Words：Drosophila suzukii, occurrence, pupation, removal of dropped fruits
Abstract：
[Objectives] To improve control of Drosophila suzukii by providing information on the seasonal abundance of this pest and the damage it causes to fruit crops. [Methods] The population dynamics of D. suzukii were investigated by trapping adults with a sweet lure (sugar + vinegar +alcohol) in a bayberry orchard in Shiping County from April to July in 2016. Fresh and fallen fruits were collected in orchards and kept in a laboratory to investigate the percentage of infested fruits. Soil samples were obtained from orchards to determine if there were pupae in soil. Regular removal of fallen fruit was evaluated as a means of reducing D. suzukii abundance in orchards. [Results] D. suzukii occurred from April to mid-July in bayberry orchards and reached peak abundance at the end June when 100% of fruits were infested. Several Drosophila species could be found in infested fruits. D. suzukii can pupate in both fruit and soil. Timely removal of fallen fruit significantly reduced the number of D. suzukii in orchards. [Conclusion] Drosophila suzukii, together with other Drosophila species, can infest bayberry fruits. Timely removal of fallen fruit can significantly reduce the abundance of D. suzukii in orchards.