EPI

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EPI
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Internal Report - V 1.0.2 Lab. de Sist.
Evolutivos e Eng. Biomédica Instituto de
Sistemas e Robótica Instituto Superior
Técnico A Study on the EPI-mildium
Model Authors Eng. Cleide Costa Eng. João
Carlos Costa Prof. Agostinho Rosa
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1 Introduction Downy mildew epidemic behaviour
depends on the relationship between the parasite
and the plant influenced by weather conditions.
Since the quality and quantity of the infestation
potential depends on climate-parasite-plant
(CPP) system evolution, one can consider that
the parasite has a variable physiologic energy
that reflects its capacity to undertake its
developing life cycle. In order to quantify this
energy, Strisyk developed the Potential
Infestation State (EPI) model. The model
represents the consequences of some disturbances
suffered and memorised by the CPP system and
indicates the parasite organisation degree. The
EPI model described in this work refers to
Strisyks 1983 improved version, applied to
Plasmopara viticola. Due to the fact that
Strisyks work was not available, Ronzons PhD
thesis description was used instead. In this
work, the EPI-mildium model will be referred as
EPI.
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1 Results The input data used refers to the
climatic values of the Régua and Pinhão regions,
in the years 1987, 1988, 1996, 1997 and 1998, as
well as their average value over the last 20
years. These average values were used instead of
the Bordeaux region average values of the
respective years since it was not possible to
obtain them. For that reason, one can consider
that the was embedded in the model
implementation.
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