The Characteristics of Oviposition and Population Dynamics of Bactrocera dorsalis in Different Fruit Orchards in Mengzi

In this study, we conducted the detailed investigation of population dynamics and the detailed investigation of damage habit of Bactrocera dorsalis on floquat, jujube, pomegranate, and peach orchard in Mengzi City, Yunnan Province form March 2014 to March 2015. The results showed that the peak population of loquat, jujube, pomegranate, and peach orchard's B. dorsalis were exhibited from July to September. After October, the number of B.dorsalis population decreased gradually and remained at a low level till March or April next year. From April 2014 to June, the population dynamics in each orchard were different. The number of B. dorsalis in pomegranate orchard was the highest, in turn were jujube, loquat garden and peach garden. There were differences on fruit oviposition hole number, individual fecundity, and oviposition site of B.dorsalis between different hosts and different maturity at the same host. The fruit oviposition hole number and individual fecundity on green loquat were less than mature loquat,and the site of oviposition was closer to the pedicle than mature loquat. The oviporus on pomegranate distributed in fruit stem, and distributed evenly on peach jujube and ripe loquat. The fruit oviposition hole number and individual fecundity on different fruit were related to the size of fruit. Big fruit like pomegranate and peach had bigger fruit oviposition hole number and individual fecundity than small fruit like loquat and jujube.