麦长管蚜自然种群生命表研究初报

1986—1987年,用分代隔离观测等方法克服世代重叠和有翅蚜迁飞的干扰,研究了麦长管蚜自然种群特定年龄生命表,共获得9个世代的数据。分析结果表明,影响麦长管蚜自然种群波动的主要因素是天气条件和天敌;低龄若蚜主要受风雨影响,一次大风雨可使其密度下降30—80％,高龄若蚜和成蚜则受天敌和风雨共同作用;捕食性天敌对4种麦蚜间无选择性,而蚜茧蜂对禾谷缢管蚜和麦无网蚜控制作用很小。因此,麦长管蚜种群还受其它种麦蚜密度影响。

PRELIMINARY STUDY ON THE NATURAL POPULATION LIFE TABLE OF ENGLISH GRAIN APHID MACROSIPHUM AVENAE (FABRICIUS)

In 1986-1987,the age-specific life table of english grain aphid was studide on its natural population in wheat field,in Zhengzhou,Henan,using some methods such as separated observation of two continuous generations,etc.,to overcome the interference of generation overlap and alatae migration.Data of nine generations were obtained.The analyses showed that the main factors causing the fluctuation of natural population were weather condition and natural enemies.Young nymphs were mainly controlled by wind and rain,30-80% of the population had lost after an elements befell.Other immaturities and adults were affected jointly by natural enemies,wind and rain.The predators showed nonpreference to four species of aphids,while the aphid parasites showed less control function to birdcherry aphid and rose grass aphid.Therefore,the densities of other aphid species were also influential to those of english grain aphid.