滇西南沧源县白背飞虱种群发生特点

摘要

为掌握滇西南沧源县白背飞虱种群发生特点,2010-2013年,采用田间调查和灯光诱测法研究白背飞虱越冬特征和种群消长规律。结果表明,白背飞虱成、若虫可在再生稻、落粒稻、早稻秧苗和稻桩上越冬,但虫量较少,最高756头/667 m2,且主要在海拔1244 m 以下区域。灯下成虫始见期为3-4月,终见期一般为11月。灯诱出现双峰现象,第一高峰期5-6月,第二高峰期9月。4年灯下累计总虫量依次为17764、8157、18590、2538头。田间白背飞虱种群第1、2代高峰期在4月下旬-5月下旬、6月中下旬。2010-2013年,田间发生程度依次为重发生、中等发生、重发生和中偏轻发生年。建议加强秧田和5-6月主害代的监测,这两个时期虫口数量是决定是否需要防治的关键。%To understand the occurrence characteristics of Sogatella furcifera (Horváth)in Cangyuan County, southwest Yunnan,systematic field investigation and light-trap collection were conducted to study the over-winte-ring and population dynamics of S .furcifera from 2010 to 2013.The adults and nymphs of S .furcifera could over-winter in ratoon,shattering rice,rice piles and rice seedling piles,and the highest population density was 756 adults/ 667 m2 ,distributed at the altitude below 1 244 m.The first appearance of adults under lights was from March to April,and the last in November.Light trap showed a bimodal phenomenon,with the first peak from May to June and the second in September.The accumulative insect population sizes were 1 7 764,8 1 57,18 590 and 2 538 accordingly in the four years.The peak period of field population was the same as the peak of light-trapped population concentrated in May and June.The field occurrence degrees were serious,moderate,serious and light from 2010 to 2013,respectively.Recommendations are given to strengthen the prevention of seedlings and main harmful generations in May and June.