Malaysia has the distinction of being the world's fifth largest pepper producer country whereby 98% of the country's annual production comes from the State of Sarawak. However, crop loss due to pest and disease incidence has been identified as one of the major pepper production constraints. Inefficient advisory mechanism and assistance from extension staff due to technical and logistic limitations have hindered the pest and disease diagnosis effort for pepper. Currently, extension staff from MPB will have to travel to the rural farms when contacted, or during their visits to advice or treat the plants. Therefore, by the Malaysian Pepper Board and Universiti Kebangsaan Malaysia has jointly developed Dr.LADA apps to diagnose six pests and ten diseases of pepper, which commonly found in Malaysia. This agriculture app can recommend appropriate management measures to solve the problems. This an interactive Android-based mobile app with an inference engine utilizes the decision tree with forward-backward chaining methods to trigger the correct disease or pest based on syndromes. The knowledge is interconnected symptoms extracted and validated by Malaysian Pepper Board experts. Dr.LADA is a native mobile app developed on a Java-based platform, which provides fast performance, a high degree of reliability and can be used without any internet connection. The app has been tested with 10 case studies carried out by the Malaysian Pepper Board and scored 97% of accuracy. Having Dr.LADA, the user can identify problems by answering a series of questions from symptoms shown by several plant parts. Therefore, the dependency of farmers on extension staff is reduced, and indirectly minimizing the extension activity costs.