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菜粉蝶 Pieris rape L 幼虫,俗名菜青虫,是甘兰、白菜等十字花科蔬菜的主要害虫,在我市发生严重。为了挖掘和利用有益的天敌昆虫资源,1980年,我们对该虫寄生性天敌进行了初步调查研究。一、调查方法及结果采取室内饲养观察和田间系统调查的方法。在菜青虫发生季节,从田间采回大量幼虫,蛹和卵分期进行饲养,观察记载寄生性天敌种类及寄生率。田间调查方法:选有代表性的甘兰田,每块田取5点,每点9株,隔5天调查一次,记载益、害虫发生的种类
Pieris rape L larvae cabbage butterfly, common name cabbage caterpillar, is cabbage, cabbage and other cruciferous vegetables, the main pests, serious in our city. In order to excavate and utilize beneficial insect natural enemies, in 1980, we carried out a preliminary investigation of the parasitic natural enemies. First, the survey methods and results to take indoor feeding observation and field systematic investigation methods. In the season of Pieris rapae, a large number of larvae, pupae and ovum were collected from the field for rearing, and the species and parasitism of parasitoids were observed and recorded. Method of field survey: Choose a representative field of Ganlan, each field take 5 points, 9 points each, once every 5 days to investigate, record benefits, pest species