岫岩地区大豆蚜虫田间消长及天敌跟随规律初报

A Report on Number Change Laws of Soybean Aphids and Their Natural Enemies in Xiuyan Farm Area

通过对大豆蚜虫百株蚜量、百株天敌的调查,探索大豆蚜虫与天敌的跟随规律,进一步拓宽大豆蚜虫防治领域。调查结果发现每年从7月5日至9月21日田间百株蚜量和田间有蚜株数各出现两次高峰,田间百株蚜量高峰日后5天田间有蚜株率达到高峰。蚜虫天敌复合种群跟随蚜虫紧密,蚜虫高峰同期或延后5天即为蚜虫天敌的高峰,说明大豆蚜虫百株蚜量达到高峰后有翅蚜大量产生并扩散迁飞致使田间有蚜株率达到高峰,而此时正是大豆蚜虫天敌的高峰期,因此大豆蚜虫百株蚜量逐渐呈下降趋势,蚜虫天敌对蚜虫的控制起着决定作用。

The number change laws of soybean aphid and their natural enemies per 100 plants were investigated in order to extend the prevention and control scope of soybean aphid.It was found that soybean aphids per 100 plants and plants which had soybean aphids reached two peak numbers from July 5 to September 21 each year.The number of their natural enemies reached the peak number at the same time or 5 days later.This demonstrated that after the number of soybean aphid per 100 plants reached its peak value,a great d...