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近年来我国利用七星瓢虫防治蚜虫的工作有了迅速的发展。但是,目前对七星瓢虫的发生规律了解仍很不够。每年5月下旬、6月上旬田间七星瓢虫常突然大量减少,而在当地又未发现大量的死虫。但在1976年5、6月间却在秦皇岛海滨首次发现了七星瓢虫的大量群聚。我们从1976年至1979年连续四年对海滨七星瓢虫的群聚现象进行了研究,初步证明秦皇岛七星瓢虫种群不是当地的,而是从外地迁入的。
In recent years, the use of ladybird ladybug control aphids in our country has developed rapidly. However, the current understanding of the occurrence of the ladybird is still not enough. In late May and early June of each year, the ladybugs of Coccinella septempunctata suddenly and greatly reduce, and a large number of dead insects are not found in the area. However, in May and June 1976, it was the first time in Qinhuangdao beach discovered a large number of ladybird ladybugs. From 1976 to 1979, we studied the cluster phenomenon of ladybird on the coast for seven years in a row, and initially proved that the ladybird population of Qixing in Qinhuangdao was not from the locality, but from the outside.