There have been several attempts to combine host
and pathogen development since in order to account for
the effect of changing environments on disease progress.
According to Hau (1990), the only way for a disease
progress curve to diminish is through a changing host,
either by (i) an increase of susceptible tissue, referred to as
a dilution effect, or (ii) by the loss of the diseased tissue by
defoliation, referred to as a thinning-out effect, or (iii) as
a result of ontogenic resistance. For vine and powdery
mildew, a set of deterministic models taking into account
host growth and based on the modified Van der Plank
equations were developed (Sall, 1980; Blaise & Gessler,
1992; Gessler & Blaise, 1992).
There have been several attempts to combine hostand pathogen development since in order to account forthe effect of changing environments on disease progress.According to Hau (1990), the only way for a diseaseprogress curve to diminish is through a changing host,either by (i) an increase of susceptible tissue, referred to asa dilution effect, or (ii) by the loss of the diseased tissue bydefoliation, referred to as a thinning-out effect, or (iii) asa result of ontogenic resistance. For vine and powderymildew, a set of deterministic models taking into accounthost growth and based on the modified Van der Plankequations were developed (Sall, 1980; Blaise & Gessler,1992; Gessler & Blaise, 1992).
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