Effect of damping-off on the growth parameters of cucumber
plants
P. melonis inoculation decreased fresh and dry weights of roots
and shoots, root volume and collar diameter between cucumber genotypes
significantly. This reduction was greater in high susceptible Mini6-23
and Extrem (Table 2). No difference in these plant growth parameters was
observed between the inoculated Ramezz, compared to the healthy control
(Table 2). A strong significant negative correlation between the
percentage of disease incidence caused by P. melonis and the
fresh weights of roots (r2 = -0.65), dry weights of
roots (r2 = -0.83), root volume (r2= -0.68), and collar diameter (r2 = -0.70) were
determined. There was also a moderate negative correlation between the
percentage of disease incidence and root diameter (r2 = -0.57).