Population dynamics and summer and winter habitats of Bradysia odoriphaga in the Beijing area
Author of the article:SHI Cai-Hua1, 2** YANG Yu-Ting1 HAN Hao-Lin2 CHEN Jia-Xu1 WU Qing-Jun2 XU Bao-Yun2 ZHANG You-J
Author's Workplace：1. College of Agriculture, Yangtze University, Jingzhou 434025, China; 2. Department of Plant Protection, Institute ofVegetables and Flowers, Chinese Academy of Agricultural Science, Beijing 100081, China
Key Words：Bradysia odoriphaga, population dynamics, over-summer, over-winter
Abstract： [Objectives] To clarify the population dynamics and the summer and winter habitats of Bradysia odoriphaga under different Chinese chive cultivation and management regimes in the Beijing area. [Methods] B. odoriphaga imagoes were monitored using yellow swatches in fields and greenhouses from 2014 to 2015. The location and stage of development of B. odoriphaga in winter and summer were surveyed by digging up the roots of chives and netting. [Results] B. odoriphaga has three to four generations in chive fields annually but is present all the year round in greenhouses. The peak of crop damage is in spring and autumn. B.odoriphaga is mainly distributed in soil at a depth of 0-5 cm. The population is lower in winter than in summer. In summer, B. odoriphaga is predominantly found in local chive fields and over-winters as 4th instar larvae inside chive bulbs or in soil. [Conclusion] This study describes the population dynamics and summer and winter habitats of B. odoriphaga under different Chinese chive cultivation and management models in the Beijing area and thereby provides a basis for the prediction and control of B. odoriphaga.