Abstract: In the information age， the development of agriculture not only needs adopting the agricultural technology， but also needs expanding the ways of dissemination and promotion of agricultural knowledge and technology， which are applied effectively in various fields of agriculture by the means of information technology. This project mainly starts from the information of the current status and requirements of pest and disease control， and develops a knowledge database system with B/S structure which is based on J2EE platform and Spring， Struts2 and other open-source frameworks. The popularization of the knowledge and control technique of agricultural diseases and pests through the digital information service means will help agricultural technicians and farmers to understand various plant diseases and pests with respect to their occurrence， diffusion， identification method and control technology and achieve the effective control of agricultural pests. The database system will promote the development of Zhejiang agriculture and rural information construction. It is importanat for “new socialist countryside” construction and has a wide prospect of application.

Key words: agricultural pests, prevention and cure by pesticides, knowledge database system, diagnosis