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This expert system is an application that uses facts and reasoning techniques that are used by an expert. While the disease in dragon fruit include: rust red algae, patches of orange tendrils, white vine, vine blight and anthracnose.The method used is backward chaining and forward chaining, the system is implemented into a web that can be operated by the public, especially dragon fruit farmer. Pests on dragon fruit include mealybugs, aphids, ants, grasshoppers, mites and snails. JURNAL SISTEM INFORMASI DAN TEKNIK KOMPUTER CATUR SAKTI Vol. This expert system can be used as information and guidelines for disease that appears on dragon fruit plants and to fill them. Many farmers still rely on the knowledge of an expert to be able to diagnose a disease, so it takes a long and costly. Farmersknowledge about dragon fruit disease is still low.