2009年徽州稻区白背飞虱种群消长及虫源性质

徽州稻区作为我国白背飞虱北迁与南迁的重要中转站之一,地理位置十分特殊,分析其中、晚稻田白背飞虱种群动态及虫源性质,对皖南稻区乃至江淮稻区白背飞虱预测预报和防治工作意义重大。通过田间系统调查和长翅雌虫卵巢解剖,研究了徽州稻区白背飞虱种群消长及虫源性质。运用GrADS和ArcGIS分析2009年白背飞虱主要迁入期的天气背景,并利用HYSPLIT轨迹模拟平台对主要迁入期进行数值模拟和虫源地分析。结果表明:2009年徽州稻区白背飞虱在中、晚稻以第3代危害为主。中稻田第2—4代白背飞虱属于基本迁出型,同时第3代前半期还存在部分滞留本地繁殖或者是外地白背飞虱迁入现象;而晚稻第3代后半期白背飞虱属于基本迁入型,第4—5代属于基本迁出型。风切变、下沉气流和强降水可作为徽州稻区预测白背飞虱迁入的气象背景。2009年徽州稻区白背飞虱虫源地主要分布在湘南、赣中及赣南。

Analysis on population fluctuation and properties of the white-backed planthopper in Huizhou in 2009

The population dynamics and generation properties of the white backed planthopper (WBPH) in Huizhou, southern Anhui Province were studied through systematic field survey and ovarian dissection of macropterous female. By using GrADS and ArcGIS, the weather backgrounds during the major immigration periods in 2009 were analyzed. The spatial distributions of source areas of the immigrated WBPH at different generations were analyzed by trajectory analysis using HYSPLIT, a simulation tool of migratory pathways. The main results were as following: (1) The third generation of WBPH was provided most damage to the middle and late rice in Huizhou, 2009. (2) From tiller to ripen rice stages, the generations next to the immigrations all exhibited chiefly as the emigration, and there was no obvious local breeding generation, and the 3^rd generation would emigrate but some immigration peaks could be seen synchronously. (3) The population source areas of each immigrant generations were tracked through the trajectory analysis. It was indicated that most of the immigrants came from the southern Hunan Province, the central and southern Jiangxi Province. (4) The appearance of horizontal wind shear, downdraft and heavy precipitation could be the synoptic backgrounds for prediction of the immigration of WBPH in Huizhou, Anhui Province.