Price reduction function

Give the price reduction rate associated with the infection on the (grapevine) fruits

price_reduction(
  I_host,
  N_host,
  Nhost,
  Nyears,
  nTSpY,
  severity_thresh = 0.075,
  price_penalty = 0.3
)

Arguments

I_host

number of infected individuals for each cultivar and timestep

N_host

total number of individuals for each cultivar and timestep

Nhost

total number of cultivars considered in the simulation

Nyears

number of simulated cropping seasons

nTSpY

number of timesteps (e.g. days) per cropping season

severity_thresh

disease severity threshold above which the price reduction is applied

price_penalty

percentage of price reduction

Value

A matrix with the price reduction rate per cultivar and per year of simulation

References

Savary, S., Delbac, L., Rochas, A., Taisant, G., & Willocquet, L. (2009). Analysis of nonlinear relationships in dual epidemics, and its application to the management of grapevine downy and powdery mildews. Phytopathology, 99(8), 930-942.