Seasonal Monitoring Ofdrosophila Suzukiiand Its Non-Crop Hosts In Wuhu, Eastern China

Drosophila suzukii(Matsumura) (Diptera: Drosophilidae) is a serious pest that prefers fresh fruits and is native to Southeast Asia. In our study, apple cider vinegar bait traps were used to capture and monitor the population dynamics of this native pest in Wuhu City, China, from May/June 2017 to May 2018. The research was conducted at 15 locations in two fruit orchards in Wuhu. Traps caught more adults in general in a Meiling blueberry orchard than in a Xicun mixed orchard, and the highest trap counts occurred near harvest time (October). Females had more mature eggs from September to November, and the number of mature eggs declined thereafter. We found several non-crop hosts, which can provide food and reproductive resources forD. suzukiiand are common in forests and field margins. By comparing the number of captured adults in the Meiling and Xicun orchards, we found that blueberry was preferred byD. suzukiiamong the fruits in our search. Fruit ripening times differed among crops; therefore, fly populations moved between crop and non-crop habitats during the year or had varying population dynamics on different crops in different seasons. TheD. suzukiipopulation and the number of mature eggs decreased in summer and winter but increased in spring and autumn.Drosophila suzukiihad higher survival rates with blueberry than those with other fruits, andD. suzukiicould use four non-crop species growing around the orchards as host plants.