How many types of plant diseases are there?

Plant diseases are generally categorized into two main types: biotic and abiotic diseases. Biotic diseases are caused by living organisms, such as fungi, bacteria, viruses, and nematodes. These pathogens can invade plants, exploiting them as hosts and leading to various symptoms including discoloration, wilting, or even death. Abiotic diseases, on the other hand, stem from non-living environmental factors or conditions, such as nutrient deficiencies, water stress, temperature extremes, or chemical toxicity. Understanding these two categories is crucial for diagnosing plant health problems and implementing effective management strategies. By distinguishing between biotic and abiotic factors, horticulturists can better address the underlying issues affecting plant growth and development.