摘要
稻纵卷叶螟(Cnaphalocrocis medinalis Guenee)过去一直被视为定居性害虫。1965年以前,我国各地仅局部偶发为害,系统研究不多。六十年代中期以后,随着农业改制、品种更换、密植高肥、广用农药等生产条件的改变,农田生态系统产生了有利于这一害虫发展的深刻变化,发生区域扩大,为害程度加重,大发生频次增加,已经成为全国主要稻区的普遍性、常发性大害虫。1968至1973年有16个省、市、自治区相继开展了发生规律和单项防治技术的专题研究。1974—1977年,从越冬区域的局限性,广大区域蛾源同期突增,以及异地标放回收试验等方面提供依据,证实了稻纵卷叶螟存在远距离迁飞为害的特性,提出了迁飞假想途径,同时开展了综合防治研究。1978—1980年,这一迁飞研究被列为全国重点项目,通过三年全国性协作,初步解决了它在我国东半部的往返迁飞途径,并通过联合测报网,试行了迁飞异地测报。
Systemic studies on the rules governing the occurrence of rice leaf roller(Cnaphaloerocis medinalis Guenee)were conducted in China from 1968,while studies on the characteristics of long distance migration of this insect were conducted from 1974.The results of experiments on the cold tolerance and hibernation of the insect indicated that the regions of overwintering could be divided according to the isotherm of average temperatures in January.The areas south of 16℃isotherm were"regions of growth throughout the year";the areas of 4—16℃were"regions of hibernation";and the areas north of 4℃were"regions of winter death".According to the division of hibernating regions,the simultaneous sudden increase of moths,the catching of moths from air and sea surface,the reproductive diapause during migration,the phenomenon of occurrence of homotypic moths,and the recovering and release of the moths by coloured marking,the characteristics of migration were clarified and the regions of outbreaks were discovered.These results showed that there are five migrations from south to north and three southward reversed migrations in the eastern part of China.Vertical migrations in the mountainous regions and the mechanism of migration were investigated too.A national network for the joint forecast of rice leaf roller was organized,and interim forecasts on the insect’s occurrence and migration have been issued.
出处
《中国农业科学》
1981年第5期1-8,共8页
Scientia Agricultura Sinica
基金
全国重点项目。
