SUMMARY: Graded doses of six phytopathogenic bacteria, namely and were introduced into the leaves of one of their natural (homologous) hosts and of other (heterologous) plants. Probit slopes for the infectivity of any of the six bacteria did not exceed the value =2 in the homologous combinations, but were much greater than 2 in the heterologous ones. In the homologous combinations, the mean probability, per inoculated bacterium of multiplying to induce host response was invariant to inoculum dose, Hence the probability, that a host would not respond after inoculation with bacteria was given by the simple exponential, . In the heterologous combinations, the value of increased with increasing .


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error