Abstract: Aphidus gifuensis is a dominant natural enemy of Myzus persicae playing an important role in controlling M. persicae. Breeding A. gifuensis by tobacco floating-seedling system has been developed， and has been applied in Yunnan province in a large scale， which suggested that such a way could be important in reducing the chemical pesticides consumption. In this paper， factors which affected the production of A. gifuensis in the tobacco seedling floating system were analyzed， and optimizations were proposed. Several technical bottlenecks were suggested to be further studied for exploring the industrial production and furthermore to encourage a broader range of applications.

Key words: Aphidus gifuensis, aphid, tobacco seedlings in the floating system