Series of events which finally culminated into disease

1. Introduction to Plant Pathology
Phases in Plant Pathology Study
II. Pathogenesis
A chain of events in the development of disease.
An insight of Host-Microbe interaction. We scrutinize both pathogen
and host

2. Pathogen always desperate to reach new leaves or new host plant

3. I. Active Movement (Dispersal) II. Passive movement (Dispersal)
By oneself By agency or carrier
Fungi: Zoospores Wind,Water,Soil,Tools etc.
Bacteria: Flagella Wind,Water,Soil,Tools etc.
Nematodes: Muscles Water,Soil,Tools etc.
Virus? Vector

4. Inoculation: When host and pathogen come in contact
Inoculum:
i. Fungi: spore, hyphae, mycelium, fruiting body
ii. Nematode: egg, juvenile,adult
iii. Bacteria: bacterial cell
iv. Virus: Virus particle
Propagule: Single Unit of Inoculum

6. Twists & Turns
✔ ?
X

7. Why Pathogen likes some & dislikes others?

8. Basis of this Recognition
 Plant produces cues which are picked by pathogen
 Plant allows pathogen to attach and enter into it
 Plant has certain nutrients which are required by pathogen
 Plant doen’t has anti-microbial compounds to kill the pathogen etc.

9. Agree on pathogen but why plant allows pathogen to live and take
away the nutrients ????

10. Courtesy: The Sun UK

11. Host Range: The plants which be infected by pathogen
It is based on compatibility between host-microbe

12. Attachment:

13. Inoculation is the first serious interaction between host and pathogen which can leadto disease
https://www.youtube.com/watch?v=Uo9Ln9GlMyU&t=1s