Model description. Adapted from Savary et al.(2012)
epirice.model(param, weather, sdate = 1, ldate = 120, H0 = 600): a vector of parameters
: weather data.frame for one single year
: date to begin simulation (day of year) (default 1)
: date to end simulation (day of year) (default 120)
: initial number of plant's healthy sites(default 600)
data.frame with daily state variable