- It is the third link in the infection chain after survival and dispersal of inoculum
- Entry and colonization of pathogen in the host tissues is known as establishment and the infective propagules coming in contact with the host are known as inoculum.
Inoculum potential: It is the inoculum needed for successful infection. It is a function of inoculum density and their capacity.
Def: It is defined as the energy of growth of a parasite available for infection of a host at the surface of the host organ to be infected (Garret, 1960).