Assessment of Vigour Index (VI) and Disease Incidence (DI)
VI and DI were used to assess the wilt and blight disease
respectively. Plant growth parameters namely root length (cm),shoot length (cm), germination percentage was used to
calculate the VI and DI. VI was calculated using the formula:
Root length (cm) + Shoot length (cm) x germination
percentage. DI was calculated using the formula (n/N) x 100,
where n= number of diseased plants and N= Total number of
plants investigated (Singh et al., 2011).