The 1st computer simulation model against Alternaria solani causing blight disease in tomato and potato is

Answer: Option A

The 1^st computer simulation model against Alternaria solani causing blight disease in tomato and potato is EPIDEM.
One of the first computer simulation programs, called EPIDEM, was written in 1969 and resulted from modelling each stage of the life cycle of a pathogen as a function of the environment.
EPIDEM was designed to simulate epidemics of early blight of tomato and potato caused by the fungus Alternaria solani.