2024年我国南方早稻区稻飞虱首次迁入虫源地及其气象背景分析OA

To identify the overseas source regions of the first immigration of rice planthoppers(RPH)into early-rice areas in south of China,pest monitoring data from south of China and Vietnam in 2024 were collected and analyzed.Migration trajectory analysis was applied to simulate the early immigration processes of RPH into early-rice areas in south of China.In addition,migration pathways of Vietnamese populations were examined to further determine the major source regions contributing to the early populations in south of China.Combined with concurrent meteorological data,synoptic and climatological approaches were employed to reveal the meteorological background associated with large-scale transboundary migration of RPH.Our results indicated that from late March to late April 2024,early-rice areas in south of China experienced a large-scale immigration of RPH.The primary overseas source region was Vietnam,followed by Laos,with a low probability of contributions from Thailand.During this period,the northern Indochina Peninsula was dominated by ascending airflow,and strong southwesterly winds extended from the Indochina Peninsula to southwestern and southern China.Favorable thermal conditions and precipitation events jointly created meteorological environments conducive to long-distance cross-border migration and successful landing of RPH,facilitating large-scale immigration into early-rice areas of South China.