Fundamentals of Plant Pathology

PATH 171 is a foundational plant pathology course that introduces plant pathogens, disease development, fungal and bacterial basics, viruses, nematodes, epidemiology, and disease-management principles.

The disease triangle shows that plant disease develops only when a susceptible host, a virulent pathogen, and a favorable environment occur together.

Biotic diseases are caused by living agents such as fungi, bacteria, viruses, and nematodes, while abiotic disorders result from nonliving factors like nutrient imbalance, temperature stress, moisture problems, or chemical injury.

Koch's postulates are a classic set of steps used to link a suspected pathogen with a disease by isolating it, reproducing the disease in a healthy host, and then confirming the same organism again.

Epidemiology is important because it explains how diseases start, spread, and become severe under field conditions, which helps in timing and designing better management strategies.

Pathogenesis refers to the process by which a pathogen infects a plant, colonizes tissues, causes damage, and produces disease symptoms through its interaction with the host.

Students study fungicides and formulations because disease control depends not only on choosing the right active ingredient but also on understanding mode of action, safe use, concentration, and application method.

Integrated plant disease management means combining cultural, biological, chemical, host-resistance, and regulatory measures in a coordinated way to manage diseases more effectively and sustainably.