Plant disease epidemiology Biological control 1 Chemical nature and classification of fungicides 1 Diagnosis of plant pathogens 1 Genetics of plant pathogens 1 History of plant pathology 1 Laboratory and analytical techniques 1 Mycology 1 Physiological and molecular plant pathology 1 Phytopathological techniques 1 Plant bacteriology 1 Plant pathology 1 Plant viorology 1 The pathogens-bacteria 1 The pathogens-fungi 1 The pathogens-viruses 1