Agriculture Expert systems (AES) are identified as powerful tool for extension workers. It is also known as knowledge based system (KBS). Expert system is a special computer program designed to simulate the problem solving behavior of an expert in a narrow domain or discipline. In agriculture such system integrate the accumulated expertise of
various discipline such as entomology, horticulture, soil management into a framework that best address the specific problems and onsite needs of the farmers. It combines experimental and conventional knowledge with the reasoning skills of specialists to help farmers in making the best decisions for raising a successful crop.