A precise definition of the defense and resistance potential
of each host plant throughout its life cycle is a key element for
the control of pathogen infection, and is essential to ensure
high crop yields. In the context of integrated crop management,
developmental resistance is considered as an important
factor in the rationalization of cultural practices for vines and
is being evaluated for use in several other crop species (Cooley
et al., 1996; Ficke et al., 2002). The occurance of an effective
resistance in the field should make it possible to refine models
for forecasting plant disease epidemics and for optimizing farm