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Pathology P2 - Coggle Diagram

- - - - development
- - - - host plant inable to resist effect of pathogen/damaging factor
      - cant resist effect of causal agents
  - - - degree of pathogenicity
      - ability of pathogen to cause diseease
      - to what extent
      - avirulence
        
        no virulence
      - aggressiveness
  - - - association
        
        symptoms & their associated signs
        
        sign intimately associated w/ symptoms
        
        always see sign & symptom
      - isolation
        
        morpho & molecular characterization
      - inoculation
        
        introduction of isolated microbe to healthy plant
        
        observe symptoms
        
        symptoms must be similar to observed initial symptoms observed in field (association)
      - reisolation
        
        isolation of introduced microbe
        
        compare & identify original & reisolated microbes
        
        if matched then microve cause disease
    - - pathogens cant be grown in culture
      - envi conditions cant be easily reproduced
      - one-microbe-one-disease not applicable at all times
- - - - necrotic
        
        death of affected tissues
        
        rot, cnaker, damping off, leaef spot, blight, dieback, bleeding, marginal burning
        
        canker
        
        dead section
        
        leaf spot
        
        anthracnose
        
        shot hole on leaves
        
        die back
        
        start at tip (discoloration), then go down
        
        brown root rot
        
        phellinus noxius
      - atrophic
        
        subnormal/slowing down
        
        devt of affected part
        
        dwarfing, resetting, chlorosis, etiolation
        
        rosetting
        
        deformation
        
        leaves clumped together
        
        shortening of internodes
        
        chlorsis
        
        yellowing
        
        partial suppression of chlorophyll formation
        
        etiolation
        
        insufficient light
        
        excesssive spindiness
      - hypertrophic
        
        overgrowth, enlargement, accelerated diffirentiation
        
        galls, callus, leaf curling, witches broom, fasciation
        
        gall
        
        agrobacterium
        
        witches broom
        
        overproliferation of shoots
        
        short internodes
        
        pathogen degrades DRC
        
        DRC control branching gene
        
        plant produce lots of branches
        
        epinasty
        
        downward curling of leaf blade
        
        rapid cell growth on upper side of petiole
        
        russeting
        
        skin of fruit has browning patches
        
        rough
        
        fasciation
        
        flattening of organs
        
        disruption of apical bud
  - - - phenillinus noxius
    - - uromycladium falcatarium
- - - - transfer of inoculum
        
        infection court
        
        part of host where inoculum lands
        
        inoculum = pathogen
    - - time interval
        
        inoculation until pathogen enter plant
        
        waiting period
    - - pathogen invation & disease symptoms
      - colonization of plant tissue