异色瓢虫Leis axyridis Pallas是落叶松大蚜Cinara sp的主要天敌之一。笔者曾就异色瓢虫成虫在不同大蚜密度下的捕食功能进行了初步研究。本文在此基础上对异色瓢虫成虫与落叶松大蚜的益害比进行初步探讨,试图为开发和利用异色瓢虫防治落叶松大蚜提供参考。 1 材料与方法试验于1988年8月在吉林省磐石县宝山林场的室内条件下进行。从落叶松林内采集异色瓢虫蛹,待成虫羽化后分别雌、雄个体 Leis axyridis Pallas is one of the main natural enemies of the larval aphid Cinara sp. The author conducted a preliminary study on the predation function of adult lady beetles at different density of aphids. Based on this, the beneficial and damage ratio of adult ladybirds and larch aphids was discussed in this paper, which is trying to provide a reference for the development and utilization of ladybirds. 1 Materials and Methods The experiment was conducted in August 1988 in the indoor conditions of Baoshan Forest Farm, Panshi County, Jilin Province. From the larch forest collected ladybird chrysalis pupae, adult females after emergence, respectively, male and female