The Bible and other early writings mention diseases, such as rusts, mildews, and blights, that have caused famine and other drastic changes in the economy of nations since the dawn of recorded history. Fossil evidence indicates that plants were affected by disease 250 million years ago. Plant diseases are known from times preceding the earliest writings. General considerations Nature and importance of plant diseases Some plant varieties are particularly subject to outbreaks of diseases while others are more resistant to them. The occurrence and prevalence of plant diseases vary from season to season, depending on the presence of the pathogen, environmental conditions, and the crops and varieties grown. Although each species is susceptible to characteristic diseases, these are, in each case, relatively few in number. All species of plants, wild and cultivated alike, are subject to disease. Plant disease, an impairment of the normal state of a plant that interrupts or modifies its vital functions.
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