云南白背飞虱的发生与种群消长特点

【目的】研究白背飞虱Sogatella furcifera(Horváth)在云南的发生与种群消长特点,为全省制定防治策略提供技术依据。【方法】2010—2011年,我们采用田间系统调查和测报灯监测方法对云南主要稻区的滇西、滇西南、滇南、滇东南、滇东和滇东北白背飞虱的发生和田间种群消长开展了系统研究。【结果】云南稻区白背飞虱的总体越冬虫量少且分布不均,主要集中在N23°55′164″以南,海拔高度为1 369 m以下有水源的稻桩、再生稻和落粒苗上,其中滇南和滇东南越冬虫量高于滇西和滇西南;灯下虫源始见期从3月初到5月下旬,滇西和滇西南最早在3月初,滇东北最晚在5月中下旬,全省有从滇西、滇西南向滇南、滇东南、滇东和滇东北逐渐延后的趋势;灯下诱集虫量表现为西南部低于东南部,全省迁入峰次数和灯下总虫量的高峰期集中在5月、6月和7月,9月下旬至10月中旬出现1次回迁高峰期;滇西南和滇南田间种群活动高峰在4月下旬至6月,滇东南和滇东在5月下旬至7月上旬,滇东北的主要在6月下旬至7月。【结论】云南省白背飞虱主害代在5月、6月和7月,重点发生在滇南、滇东南和滇西南稻区。

The occurrence characteristics and population dynamics of Sogatellafurcifera （Horvath） in Yunnan Province

Objectives] The objective of this study was to investigate the occurrence characteristics and damage caused by Sogatella furcifera （Horwith） in Yunnan Province to provide a basis for the effective control of this pest. Methodsl In 2010-2011, the population occurrence and dynamics of S. fuercifera were systematically studied in the field using light-trap collection in six major rice growing areas in Yunnan, including the west, southwest, south, southeast, east, and northeast. Results] The results show that the size of the overwintering population was smaller than in other seasons and its distribution was different in six major rice fanning areas of Yunnan; mostly concentrated on rice stubble, ratooning rice and rice seedlings in wet paddy fields at latitudes south ofN23°55′164″and altitudes below 1 369 m. Moreover, the overwintering population of S. furcifera in the south and southeast of Yunnan was more abundant than that in the west and southwest. Light-trapping indicated that the beginning of the migration period of S. furcifera was from early March to late May in the west, early March in the southwest, and middle to late May in the northeast. The migration period of S. furcifera was progressively later from the west to the southwest, south, southeast, east, and northeast. Adult numbers captured by light-trapping were lower in the southwest than the southeast and the peak immigration dates were mainly in May, June and July. The return migration peakoccurred from late September to middle October. Population peaks occurred in the southwest and south from the end of April to June, in the southeast and east from late May to early July, and in the northeast from late June to July. Conclusion] S. furcifera mostly occurs in the south, southeast and southwest of Yunnan in May, June and July.