ABSTRACT
Plant pathology is the science or study of plant diseases. The word “disease” means any impairment of normal physiological function of plants, producing characteristic symptoms. A symptom is a phenomenon accompanying something and is regarded as evidence of its existence. Disease is caused by pathogen. A pathogen is any agent that can cause disease. Plant pathology describes: (1) what causes disease, (2) how the disease is caused, (3) how the disease spreads, causing epidemic, (4) how much loss the disease can cause, and (5) how to manage the disease.
