The model simulated the development of a single vine
stock during a single season. This was coupled with the
simulation of inoculum and disease dynamics from primary
infection of susceptible leaves and secondary conidial
infection as disease spreads from sporulating lesions. Functions,
parameterized from the literature or from experimental
data, were used to describe growth of the host and
spread of the pathogen. The model input variables were
environmental (temperature, wind speed and direction) or
related to the pathogen (location and onset of primary infection).
The environmental input variables dictated growth
of the crop (appearance and growth of organs) and spread
of the pathogen (latent period, infection, lesion growth,
spore production and release). Input parameters characterized
the crop system (number of buds, training system)
and conditions of growth for the vine and the pathogen.