Application of expert systems for agricultural crop disease diagnoses — A review

India has 1.4 million square-kilometers of land under cultivation and only about 39 percent is irrigated and other 61 percent is fully dependent on rain and if rain fails or gets delayed, crops fail driving debt ridden farmers to suicide. Agricultural output of India is the second largest in the world and India is second largest producer of cotton and one of the largest exporters of cotton in the world. An average farmer family owns 5 acres of agricultural land. Applications of state of art technologies may increase the productivity/ hectors. Expert system is a computer based programs. Expert systems have been successfully used in various scientific and business applications. Expert system is also available in agricultural operations to assists the farmers to identify the suitable crops for their farmland. Expert system helps to carry out crop management incredibly effective, efficient way and offers a lot of accurate results to the farmer production systems now-a-days. Authors have carried out a review on applications of expert system for or Disease Diagnoses of Crops around the world to make assessment of the ground realities on utilization of expert system by the farmers and benefits they realized. Authors are conducting a research on the design of Expert Systems for diagnosis of diseases for Paddy crop.