Analysis on population fluctuation and properties of the white-backed planthopper in Huizhou in 2009
2009年徽州稻区白背飞虱种群消长及虫源性质

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 3rd 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.