- Host factors :
- Susceptibility of host: It is genetically controlled by DNA and it is an inheritable character which is transmitted from parents to off springs.
- Disease proneness of the host: It is decided by the external factors such as host nutrition, i.e., more nitrogen application makes the host more susceptible and more potash application leads to less susceptibility.
- Pathogen factors :
- Virulence / aggressiveness of the pathogen: It is determined by genetic material which is inheritable.
- High multiplication rate of the pathogen: Chances of infection increases with high rate of multiplication. High birth rate and low death rate is highly essential for successful infection.
- Proper inoculum potential: In case of specialized pathogens very few or even one spore is capable of causing infection successfully, whereas, non-specialized pathogens require high density of inoculum on the surface of susceptible host for successful infection.
- Environmental factors:
- Environmental conditions such as temperature, relative humidity, moisture, etc., are very important for survival, dissemination and infection process.
Process of infection can be grouped into three stages, i.e., pre-penetration, penetration and post-penetration.
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