BOT 552: PLANT DISEASE MANAGEMENT

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Many of these pathogens are disseminatedprimarily by airOr air-borne vectors and are responsible for mostof the explosive epidemics in most cropsExamples of Polycyclic DiseasesDowny mildewsPowdery mildewsLate blight of potatoLeaf spotsBlightsGrain rustsAphid borne virusesRoot-knot nematodes
III. Polyetic (multi-year) cyclesSome pathogens take several years before inoculumthey produce can be disseminated and initiate newinfections.May not cause many new infections over a given areain a year, amount of inoculum does not increasegreatly within a year.However, because they survive in perennial hosts theyhave almost as much inoculum as they had at the endof the previous year.Inoculum may increase steadily (exponentially) fromyear to year and can cause severe outbreaks whenconsidered over several years.
Page 1 and 2: PLANT DISEASE MANAGEMENTMajor Princ
Page 3: Major Principles of Plant Disease M
Page 6 and 7: C. Eradication of the Pathogen- Red
Page 8 and 9: E. Resistance of Plant to Pathogen-
Page 10 and 11: Disease TriangleHostTotal of all pr
Page 12 and 13: Therefore, disease management princ
Page 14 and 15: Understanding how disease cycles re
Page 16 and 17: DiseaseThis representation of plant
Page 18 and 19: Examples of Monocyclic DiseasesBlac
Page 20 and 21: DiseaseGraphically this type of pop
Page 24 and 25: Examples of Polyetic Diseases:Some
Page 26 and 27: Other Concepts Related to Disease C
Page 28 and 29: Propagule NumberGradients in pathog
Page 30 and 31: The percentage of disease and the s
Page 32 and 33: DiseasePurpose of disease managemen
Page 34 and 35: Ways to reduce disease (inoculum) a
Page 36: Management Strategiesa Sanitationb

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