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Causes of plant diseases can be divided into two major categories: BIOTIC and ABIOTIC.

BIOTIC causes of plant diseases are those that are biological in origin. There are five major biotic causes of plant diseases. These are the fungi, bacteria, viruses, nematodes and phytoplasmas.

ABIOTIC causes of plant diseases are non-biological in origin. Examples include things like adverse weather conditions or environmental pollutants. Often the affects of abiotic factors on plants are referred to as INJURIES.

We'll now proceed to discuss in more detail each of the five biotic causes of plant diseases, as well as biotic causes.