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Food production and security directly affect people's living standards. In recent years, some of China's corn yield corn-producing areas the speed is a downward trend, in which diseases, pests and weeds is causing one of the main maize production declined. Currently, corn is the main food crops in Jilin Province, diagnosis and treatment of insect pest of corn and prevention has always been the focus of scientific research personnel. Since the vast majority of farmers for corn diseases, pests, weeds law of development is not a lot, not able to accurately grasp on the disease, insects and weeds control at a critical juncture and the correct control methods, usually because of the overdose , medication errors and excessive drug residues and other reasons, led to increasingly serious insect pest of corn, and thus reach the desired effect on the prevention and treatment of corn. In order to better maize disease, insects and weeds to prevent and treat, especially suitable for the development of insect pest of maize production in Jilin Province diagnosis, prevention and control expert system. This article is for the production of maize situation, geographic information systems, expert knowledge and experience combined with organic farmers, the establishment of a visual, effective, capable of some important diseases, pests and weeds and query corn insect pest control expert system. The system in order to meet the majority of farmers, technical personnel needs, system interface, content and function of the system were developed. In the system implementation process, the first access to a lot of relevant literature at home and abroad, to communicate to the relevant experts to ask farmers to analyze corn often appears in the growth process of diseases, pests, weeds, according to its occurrence period and the onset of the law, and the extracted data collection and aggregation, draw relevant data and information, and then use the visual language Visual Basic 6.0, Microsoft SQL Server 2000 database and the ArcView 3.0 ArcGIS 9 tools such as GIS-based implementation Jilin corn insect pest expert system. In the system implementation process, according to need to design the two functional modules: front and back office management module management module. Front desk management module also contains a user registration / login module and query module, the user registration / login module is mainly to achieve the user login and new user registration functions; query module is by retrieving the way, the name of the insect pest or disease Symptoms input control results obtained. Management modules on the data in the system maintenance, including user information maintenance and insect knowledge maintenance, user information maintenance realization of user information to view, add, delete, modify, etc.; pests knowledge maintenance realization of diseases, pests, weeds information to add, delete, modify functions. The expert system has the following characteristics: (1) In this system, geographic information systems and expert systems combine to establish a GIS-based expert system for insect pest achieve geographic information system database and expert system's model base, knowledge base organic combination, makes the system not only has heuristic reasoning capabilities of GIS analysis and management capabilities will be together for a query corn pests and prevention has played a significant role. (2) This system is the combination of text and images, to provide users with a more intuitive data selection method; (3) friendly interface, simple operation, convenient, users do not benefit the majority of farmers training, you can use the system directly . This paper analyzes the domestic and foreign expert systems research status, detailed geographic information systems and expert systems, and system design requires the use of the environment, describes the overall function of the system and realize the operation, the last of this paper are summarized.
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