Plant Pathology is the scientific study of plant diseases caused by pathogens (infectious organisms) and environmental conditions (physiological factors). It is that branch of agricultural, botanical or biological sciences which deals with the study of: cause of the disease, Resulting losses and Control of plant diseases. Plants in both natural and cultivated populations carry inherent disease resistance, but there are numerous examples of devastating plant disease impacts. Plant pathology also involves the study of pathogen identification, disease etiology, disease cycles, economic impact, plant disease epidemiology, plant disease resistance, how plant diseases affect humans and animals, pathosystem genetics, and management of plant diseases. The objectives of the Plant Pathology are the study on: the living entities that cause diseases in plants; the non-living entities and the environmental conditions that cause disorders in plants; the mechanisms by which the disease causing agents produce diseases; the interactions between the disease causing agents and host plant in relation to overall environment; and the method of preventing or management the diseases and reducing the losses/damages caused by diseases. Organisms that cause infectious disease include fungi, oomycetes, bacteria, viruses, viroids,virus-like organisms, phytoplasmas, protozoa, nematodes and parasitic plants. It involves the study of pathogen identification, disease etiology, disease cycles, economic impact, plant disease epidemiology, plant disease resistance, how plant diseases affect humans and animals, pathosystems genetics, and management of plant diseases. Plant pathology comprises with the fundamental knowledge and technologies of Botany, Plant Anatomy, Plant Physiology, Mycology, Bacteriology, Virology, Nematology, Genetics, Molecular Biology, Genetic Engineering, Biochemistry, Horticulture, Tissue Culture, Soil Science, Forestry, Physics, Chemistry, Meteorology, Statistics and many other branches of applied science.