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褐飞虱Nilaparvata lugens(Stal)是我国水稻上的重要害虫,近年来在全国连续大暴发,给我国水稻生产造成严重的损失。广西是境外虫源迁入我国的第一站,分析其早稻田褐飞虱的种群动态和迁飞规律,对全国褐飞虱的预测预报和防治工作意义重大。采用田间系统调查与雌虫卵巢系统解剖的方法研究了2007年南宁地区早稻田的褐飞虱发生动态和世代种群特征,分析全区灯诱数据确定迁入高峰期,并运用美国NOAA网站的HYSPLIT平台对2007年广西褐飞虱早期的6段迁入高峰期进行了数值模拟和虫源地分析。结果表明:(1)2007年广西南宁地区褐飞虱在晚熟品种田的发生虫量明显高于早熟品种田,发生、危害期明显延长,为我国北方其他稻区的褐飞虱的迁入积累了充足的虫源基数。(2)确定了南宁地区的早稻田褐飞虱各发生世代的虫源性质。第2代属于大部迁入型;第3代前期属于本地繁殖,部分迁入型,后期属部分迁出型;第4代属于大部分迁出型。(3)4月下旬-5月上旬,虫源地主要分布在越南、老挝中部的地区(18°-20°N);5月中下旬,虫源地主要分布在越南、老挝较北的地区(20°-22°N),部分来自我国海南省和雷州半岛;而6月上旬桂北地区大规模迁入的虫源地主要分布在越南东北部、广西西南部;低空急流为广西褐飞虱大规模迁入提供了运载气流,而当时的降雨是迫使褐飞虱集中降落的主要原因。
Nilaparvata lugens (Stal) of brown planthopper is an important pest on rice in our country. In recent years, it has been continuously outbreak in the country, causing serious loss to rice production in China. Guangxi is the first stop for the migration of overseas insects into China. The analysis of the population dynamics and migration rules of the brown planthopper in the early rice fields is of great significance to the prediction and control of the brown planthopper in the country. The dynamics and population characteristics of brown planthopper (BPH) in the early rice paddy in Nanning district in 2007 were studied using the method of field system and anatomy of the female ovary. The data of the light trap in the whole area were analyzed to determine the peak period of immigration. Based on HYSPLIT platform of NOAA In the early stage of Guangxi Brown planthopper migration, the numerical simulation and the source of insect were conducted. The results showed that: (1) The occurrence of Nilaparvata lugens (BSPH) in late-maturing farmland in Nanning, Guangxi in 2007 was significantly higher than that of early-maturing cultivars, with significant prolongation of occurrence and damage, and sufficient accumulation of insect pests for the migration of N. lugens in other rice areas in northern China Source base. (2) The pest origin of each generation of brown planthopper in the early rice paddy field in Nanning was determined. The second generation belongs to the majority of immigrant type; the third generation of pre-belonged to the local breeding, partial immigration type, the latter part of the emigration type; the fourth generation belongs to most of the emigration. (3) In late April-early May, the source areas were mainly distributed in Vietnam and central Laos (18 ° -20 ° N); in late May, the source areas were mainly distributed in Vietnam and Laos in the north (20 ° -22 ° N), partly from Hainan Province and Leizhou Peninsula of China. In the early June, the source of large-scale migrations in northern Guangxi mainly distributed in northeastern Vietnam and southwestern Guangxi; low-level jet for large-scale brown planthopper The scale of migration provided the carrier air flow, and the rainfall at that time was the main reason for the brown-hopper landing.