Why do fungi cause most infectious plant diseases?

Fungi are responsible for an estimated two-thirds of all infectious plant diseases, making them the most common causal agents in plant pathology. Their prevalence as pathogens is largely due to their highly effective methods of reproduction, transmission, and survival.1234

Fungi produce vast quantities of spores, which are easily disseminated by wind, water, soil, birds, and insects. Once these spores land on a susceptible host, they germinate and utilize specialized structures to penetrate the plant’s defenses, such as natural openings (stomata or lenticels) or wounds. Many fungi further enhance their ability to invade and destroy plant tissue by secreting enzymes that break down cell walls or toxins that kill plant cells.354

Additionally, many pathogenic fungi exhibit remarkable resilience. They can survive adverse environmental conditions by forming resting bodies, such as sclerotia, or by existing as saprotrophs in dead plant material until a new host becomes available. This combination of efficient dispersal, aggressive infection mechanisms, and environmental durability allows fungi to successfully attack virtually all economically important plants.415