<Dd> 1875 Mikhail Woronin identified the cause of clubroot as a "plasmodiophorous organism" and gave it the name Plasmodiophora brassicae </Dd> <Dd> 1876 Fusarium oxysporum f. sp . cubense, responsible for Panama disease, discovered in bananas in Australia </Dd> <Dd> 1878--1885 Downy mildew of grape epidemic in France </Dd> <Dd> 1879 Robert Koch establishes germ theory: diseases are caused by microorganisms </Dd>

Who wrote the first book of plant pathology