关键词: 七星瓢虫, 七星瓢虫, 存活率, 发育阶段, 饲养密度, 饲养容器

Abstract: Beautiful village construction is the top-level design to realize the integration of urban and rural areas and to improve rural living environment. It is also an important part of ecological civilization construction. Beautiful village construction in the the metropolis suburbs is of great significance，not only for the conservation of the urban ecological environment, but also for the guarantee of the urban supply and the undertaking of urban resources and elements. Based on the field investigation of Caijiawa Village and Gubeikou Village in Miyun County, Beijing, the paper summarizes the experiences and problems in the construction of beautiful villages in the two regions. The paper points out that rural grass-roots organization play an important role in the construction of beautiful villages and promote the development from the bottom, which is endogenous motive force of rural green development. The paper also put forward policy recommendations for taking advantage of rural grassroots organizations to promote the construction of beautiful rural villages，including let the village elites play central roles in grass-roots organization, the implementation of the autonomy of villagers, promoting the endogenous formation of farmer cooperative organizations.