Adding several logarithmic curves on a single graph

I'm doing a study about fungicide resistance with the EC50 and I want to make a graph with a logarithmic curves for each of my isolates on the same graph but i dont find how to add all of them on the same one and how to select them from my data base.

My data base included 7 differents isolates and I would like to put for each of them a logarithmic curves to show their growths depend on the concentration of fungicide, on the same graph to see with one is the most resistant and most sensitive.

Thanks for all your answers

You may benefit from studying this useful book.
Particularly chapter 3

and also
The R Graph Gallery – Help and inspiration for R charts (

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